USRE41546E1 - Method and system for managing security tiers - Google Patents
Method and system for managing security tiers Download PDFInfo
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- USRE41546E1 USRE41546E1 US11/797,367 US79736707A USRE41546E US RE41546 E1 USRE41546 E1 US RE41546E1 US 79736707 A US79736707 A US 79736707A US RE41546 E USRE41546 E US RE41546E
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/60—Protecting data
- G06F21/62—Protecting access to data via a platform, e.g. using keys or access control rules
- G06F21/6209—Protecting access to data via a platform, e.g. using keys or access control rules to a single file or object, e.g. in a secure envelope, encrypted and accessed using a key, or with access control rules appended to the object itself
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/60—Protecting data
- G06F21/62—Protecting access to data via a platform, e.g. using keys or access control rules
- G06F21/6218—Protecting access to data via a platform, e.g. using keys or access control rules to a system of files or objects, e.g. local or distributed file system or database
- G06F21/6227—Protecting access to data via a platform, e.g. using keys or access control rules to a system of files or objects, e.g. local or distributed file system or database where protection concerns the structure of data, e.g. records, types, queries
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/10—Network architectures or network communication protocols for network security for controlling access to devices or network resources
- H04L63/105—Multiple levels of security
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/12—Applying verification of the received information
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2221/00—Indexing scheme relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F2221/21—Indexing scheme relating to G06F21/00 and subgroups addressing additional information or applications relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F2221/2107—File encryption
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2221/00—Indexing scheme relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F2221/21—Indexing scheme relating to G06F21/00 and subgroups addressing additional information or applications relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F2221/2111—Location-sensitive, e.g. geographical location, GPS
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2221/00—Indexing scheme relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F2221/21—Indexing scheme relating to G06F21/00 and subgroups addressing additional information or applications relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F2221/2113—Multi-level security, e.g. mandatory access control
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2221/00—Indexing scheme relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F2221/21—Indexing scheme relating to G06F21/00 and subgroups addressing additional information or applications relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F2221/2137—Time limited access, e.g. to a computer or data
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- G—PHYSICS
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- G06F2221/00—Indexing scheme relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F2221/21—Indexing scheme relating to G06F21/00 and subgroups addressing additional information or applications relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F2221/2141—Access rights, e.g. capability lists, access control lists, access tables, access matrices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/10—Network architectures or network communication protocols for network security for controlling access to devices or network resources
- H04L63/102—Entity profiles
Definitions
- the present invention relates to the area of protecting data in an enterprise environment, and more particularly, relates to a method and system for managing security tiers or levels without implicating accessibilities to secured files classified according to a security level.
- the Internet is the fastest growing telecommunications medium in history. This growth and the easy access it affords have significantly enhanced the opportunity to use advanced information technology for both the public and private sectors. It provides unprecedented opportunities for interaction and data sharing among businesses and individuals. However, the advantages provided by the Internet come with a significantly greater element of risk to the confidentiality and integrity of information.
- the Internet is a widely open, public and international network of interconnected computers and electronic devices. Without proper security means, an unauthorized person or machine may intercept any information traveling across the Internet and even get access to proprietary information stored in computers that interconnect to the Internet, but are otherwise generally inaccessible by the public.
- Cryptography allows people to carry over the confidence found in the physical world to the electronic world, thus allowing people to do business electronically without worries of deceit and deception. Every day hundreds of thousands of people interact electronically, whether it is through e-mail, e-commerce (business conducted over the Internet), ATM machines, or cellular phones. The perpetual increase of information transmitted electronically has lead to an increase reliance on cryptography.
- One of the ongoing efforts in protecting the proprietary information traveling across the Internet is to use one or more cryptographic techniques to secure a private communication session between two communicating computers on the Internet.
- the cryptographic techniques provides a way to transmit information across an insecure communication channel without disclosing the contents of the information to anyone eavesdropping on the communication channel.
- an encryption process in a cryptographic technique one party can protect the contents of the data in transit from access by an unauthorized third party yet the intended party can read the data using a corresponding decryption process.
- a firewall is another security measure that protects the resources of a private network from users of other networks.
- many unauthorized accesses to proprietary information occur from the inside, as opposed to from the outside.
- An example of someone gaining unauthorized access from the inside is when restricted or proprietary information is accessed by someone within an organization who is not supposed to do so.
- the present invention is related to processes, systems, architectures and software products for providing pervasive security to digital assets at all times and is particularly suitable in an inter/intra enterprise environment.
- pervasive security means that digital assets are secured at all times and can only be accessed by authenticated users with appropriate access rights or privileges, and proper security clearance in some cases, wherein the digital assets may include, but not be limited to, various types of documents, multimedia files, data, executable code, images and texts.
- secured files are in a secured form that only those with granted access rights can access. Even with the proper access privilege, when a secured file is classified, at least a security clearance key is needed to ensure those who have the right security clearance can ultimately access the contents in the classified secured file.
- a new security level is to be inserted into a set of existing security levels. For example, a security level “secret” is added between the existing security levels “top secret” and “confidential”, resulting in a new set of security levels, “top secret”, “secret” and “confidential”. Without implicating the accessibility to secured files classified at one of the existing security levels, the controllability or restrictiveness of the new security level is determined with respect to the most restrictive security level or the least security level in the existing security levels. A set of proper security parameters are generated for the new security level and subsequently the existing security levels are mapped to accommodate the new security level.
- a security level is removed from a set of existing security levels. For example, a security level “secret” is removed from the existing security levels “top secret”, “secret” and “confidential”, resulting in a new set of security levels including only “top secret” and “confidential”.
- the security parameters for the security level to be deleted are either folded up or down to an immediate next security level, depending on implementation.
- the security parameters for the immediate next security level are augmented to include those for the security level to be deleted such that the secured files classified at the security level to be deleted can still be accessed by those with proper clearance levels.
- the present invention may be implemented in software, hardware or both in combination, and employed in a client machine or a server machine.
- the present invention is implemented in an executable form loaded in a computing device and activated when the security tiers or levels are changed to provide particular needs of an organization or organizations.
- the present invention can be implemented as a method, a system, a process, software medium or other form, each yielding one or more of the following features, benefits and advantages.
- One of the features, benefits and advantages is the management mechanism of security levels in a security system, the mechanism provides flexibility in reorganizing security levels without implicating accessibility to secured files originally classified.
- Another one of the features, benefits and advantages is that secured files originally classified at a security level to be deleted can still be accessed by properly folding the security level to a next immediate security level.
- FIG. 1 shows a diagram of securing a created document according to one exemplary secured file form used in the present invention
- FIG. 2A shows a diagram of what is referred to herein as a two-pronged access scheme according to one embodiment of the present invention
- FIG. 2B shows a flowchart of a process for granting a proper security clearance level (i.e., a clearance key) according to one embodiment of the present invention
- FIG. 2C shows a diagram of generating a clearance key according to one embodiment of the present invention.
- FIG. 2D shows a diagram of generating a clearance key according to another embodiment of the present invention.
- FIG. 3A illustrates a set of security levels in a security system employed in an enterprise, a new security level being inserted to the existing security level;
- FIG. 3 B and FIG. 3C each illustrate a case in which a security level is folded into another security level
- FIG. 4A shows a flowchart or process of inserting a new security level into N security levels according to one embodiment of the present invention
- FIG. 4B shows a flowchart or process of deleting a security level out of N security levels according to one embodiment of the present invention
- FIG. 4C shows a flowchart or process of deleting a security level out of N security levels according to one embodiment of the present invention
- FIG. 5A shows an exemplary implementation of dropping an ith level out of N existing level by folding the ith level to (i—i)th level and may be understood in conjunction with FIG. 5 B and FIG. 5C ;
- FIG. 5B shows a table listing identifiers, levels, clearance keys and corresponding literal meanings according to one embodiment
- FIG. 5C shows a clearance mapping table being entered and updated.
- the present invention pertains to a process, a system, a method and a software product for securing electronic data or digital assets.
- a new security level is to be inserted into a set of existing security levels. Without implicating the accessibility to secured files classified at one of the existing security levels, the controllability or restrictiveness of the new security level is determined with respect to the most restrictive security level or the least security level in the existing security levels.
- a set of proper security parameters are generated for the new security level and subsequently the existing security levels are mapped to accommodate the new security level.
- a security level is removed from a set of existing security levels.
- the security parameters for the security level to be deleted are either folded up or down to an immediate next security level, depending on implementation.
- the security parameters for the immediate next security level are augmented to include those for the security level to be deleted such that the secured files classified at the security level to be deleted can still be accessed by those with proper clearance levels.
- references herein to “one embodiment” or “an embodiment” means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention.
- the appearances of the phrase “in one embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Further, the order of blocks in process flowcharts or diagrams representing one or more embodiments of the invention do not inherently indicate any particular order nor imply any limitations in the invention.
- a content created by a creator for the purpose of an entity is an intellectual property belonging to the creator or the entity.
- any kind of information or intellectual property can be content, though it is commonly referred to as “information” instead of “content”.
- content or information is independent of its format, it may be in a printout or an electronic document.
- content or information exists in a type of electronic data that is also referred to as a digital asset.
- a representation of the electronic data may include, but not be limited to, various types of documents, multimedia files, streaming data, dynamic or static data, executable code, images and texts.
- the electronic data is typically stored in a form that is as close to impossible as possible to read without a priori knowledge. Its purpose is to ensure privacy by keeping the content hidden from anyone for whom it is not intended, even those who have access to the electronic data.
- Example of a priori knowledge may include, but not be limited to, a password, a secret phase, biometric information or one or more keys.
- FIG. 1 shows an illustration diagram of securing a created document 100 according to one embodiment of the present invention.
- One of the purposes of creating a secured file 108 is to ensure that the contents in the document 100 can be only accessed by or revealed to an authorized user with proper access privilege.
- the user may mean a human user, a software agent, a group of users or a member thereof, a device and/or application(s). Besides a human user who needs to access a secured document, a software application or agent sometimes needs to access the secured document in order to proceed forward. Accordingly, unless specifically stated, the “user” as used herein does not necessarily pertain to a human being.
- the securing process 101 starts with an encryption process 102 , namely the document 100 that has been created or is being written into a store is encrypted by a cipher (e.g., an encryption process) with a file key (i.e., a cipher key).
- a cipher e.g., an encryption process
- a file key i.e., a cipher key
- the file key or keys may be the same or different keys for encryption and decryption and are included as part of security information contained in or pointed to by a header 106 .
- the file key or keys once obtained, can be used to decrypt the encrypted data portion 112 to reveal the contents therein.
- a set of access rules 104 (an example is shown in the figure) for the document 100 is received or created and associated with the header 106 .
- the access rules 104 determine or regulate who and/or how the document 100 , once secured, can be accessed. In some cases, the access rules 104 also determine or regulate when or where the document 100 can be accessed.
- security clearance information 107 is added to the header 106 if the secured file 108 is classified. In general, the security clearance information 107 is used to determine a level of access privilege or security level of a user who is attempting to access the contents in the secured file 108 . For example, a secured file may be classified as “Top secret”, “Secret”, “Confidential”, and “Unclassified”.
- the security clearance information 107 includes another layer of encryption of the file key with another key referred to herein as a clearance key.
- An authorized user must have a clearance key of proper security level in addition to an authenticated user key and proper access privilege to retrieve the file key.
- a user key or a group key is a cipher key assigned to an authenticated user and may be used to access a secured file or secure a file, or create a secured file. The detail of obtaining such a user key upon a user being authenticated is provided in U.S. patent application Ser. No. 10/074,804.
- the security clearance information 107 includes a set of special access rules to guard the file key.
- the retrieval of the file key requires that the user passes an access rule measurement. Since access privilege of a user may be controlled via one or more system parameters (e.g., a policy), the access rule measurement can determine if the user has sufficient access privilege to retrieve the file key in conjunction with the corresponding user key.
- system parameters e.g., a policy
- the access rule measurement can determine if the user has sufficient access privilege to retrieve the file key in conjunction with the corresponding user key.
- a user may be assigned a hierarchical security clearance level based on, perhaps, a level of trust assigned to the user.
- a level of trust implies that one user may be more trusted than another and hence the more trusted user may access more classified files.
- a level of trust may be based on job responsibility of the user or a role of the user in a project or an organization background checks, psychological profiles, or length of service, etc.
- a level of trust assigned to the user augments additional aspect to the access privilege of the user such that the user must have proper security clearance to access a classified secured file even if the user is permitted by the access rules to access the file.
- a secured classified file i.e., the file that is both secured and classified
- the level of security clearance of the user is determined by one or more clearance keys assigned thereto.
- a clearance key permits a user to access a secured file classified as “top secret”
- the same clearance key may permit the user to access all secured files classified less secure, such as “secret” or “confidential”, where it has been assumed that the user has proper access privilege to be granted by the access rules in the file.
- a clearance key is further secured by means of secondary authentication, such as re-login, biometric information verification and a second password.
- secondary authentication such as re-login, biometric information verification and a second password.
- a clearance key may not be automatically released to or activated for a user upon an authenticated login, unless the user provides additional information.
- a header is a file structure, preferably small in size, and includes, or perhaps links to, security information about a resultant secured document.
- the security information can be entirely included in a header or pointed to by a pointer that is included in the header.
- the access rules 104 are included in the header 106 .
- the security information further includes the file key and/or one or more clearance keys, in some cases, an off-line access permit (e.g. in the access rules) should such access be requested by an authorized user.
- the security information is then encrypted by a cipher (i.e., an en/decryption scheme) with a user key associated with an authorized user to produce encrypted security information 110 .
- the encrypted header 106 if no other information is added thereto, is attached to or integrated with the encrypted data portion 112 to generate the resultant secured file 108 .
- the header is placed at the beginning of the encrypted document (data portion) to facilitate an early detection of the secured nature of a secured file.
- One of the advantages of such placement is to enable an access application (i.e., an authoring or viewing tool) to immediately activate a document securing module (to be described where it deems appropriate) to decrypt the header if permitted. Nevertheless, there is no restriction as to where the encrypted header 106 is integrated with the encrypted data portion 112 .
- a cipher may be implemented based on one of many available encryption/decryption schemes. Encryption and decryption generally require the use of some secret information, referred to as a key. For some encryption mechanisms, the same key is used for both encryption and decryption; for other mechanisms, the keys used for encryption and decryption are different.
- data can be encrypted with a key according to a predetermined cipher (i.e., encryption/decryption) scheme. Examples of such schemes may include, but not be limited to, Data Encryption Standard algorithm (DES), Blowfish block cipher and Twofish cipher. Therefore, the operations of the present invention are not limited to a choice of those commonly-used encryption/decryption schemes. Any cipher scheme that is effective and reliable may be used. Hence, the details of a particular scheme are not further discussed herein so as to avoid obscuring aspects of the present invention.
- DES Data Encryption Standard algorithm
- the secured document 108 includes two parts, the encrypted data portion 112 (i.e., encrypted version of the document itself) and the header 110 that may point to or include security information for the secured document 108 .
- the encrypted data portion 112 i.e., encrypted version of the document itself
- the header 110 may point to or include security information for the secured document 108 .
- To access the contents in the encrypted data portion 112 one needs to obtain the file key to decrypt the encrypted data portion 112 .
- To obtain the file key one needs to be authenticated to get a user or group key and pass an access test in which at least the access rules in the security information are measured against the user's access privilege (i.e., access rights).
- the secured file is classified, it further requires a security level clearance on the user. In general, the security clearance level of the user must be high enough before the file key can be retrieved.
- part of the access rules may be left non-encrypted for users authorized or non-authorized alike to view embedded access permissions of a secured file in
- FIG. 2A shows a diagram 200 of what is referred to herein as a two-pronged access scheme according to one embodiment of the present invention.
- a user To access a secured file 201 , a user needs to have access privilege based on a condition of “need to know” 202 that is to be measured against by the access rules 204 embedded in the secured file 201 . If the secured file 201 is classified, the user must also have a higher security clearance level 206 that is measured against by the security clearance information 206 (e.g., one or more clearance keys. In other words, there are at least two key holes 210 that must be “inserted” with two proper keys before the secured classified file can be accessed.
- the security clearance information 206 e.g., one or more clearance keys.
- FIG. 2B shows a flowchart 220 of process for granting a proper security clearance level (i.e., a clearance key) according to one embodiment of the present invention.
- the process 220 can be initiated with a request for a clearance key.
- the process 220 may be implemented in a machine (e.g., a central server, a local server or a client machine) that provides access control management to all secured files, perhaps, in an inter/intra enterprise environment, or a combination of a local client machine used by users and the machine.
- a machine e.g., a central server, a local server or a client machine
- the process 220 awaits a request for a clearance key. It is described that a secured file can be classified or unclassified. When it is determined that a user needs to access a secured file that is classified at a security level, such request is provided to activate the process 220 . In general, the request pertains to a specific user or some members in a group.
- a corresponding account for the user is retrieved, provided there is the account for the user. If the account is not available, then the account shall be opened accordingly.
- the process 220 may be part of the process of opening an appropriate account for a user who has the need-to-know basis to access secured files at certain security or confidential level(s).
- the corresponding account information may include a username or identifier, membership information, designated access privilege, and a corresponding user key (which sometimes is a pair of a private key and a public key).
- a security level for the user is determined, which is usually done by the necessity. For example, an executive of an enterprise may be assigned the highest security clearance level and a front desk receptionist may be assigned the lowest security clearance level. Once the security level is determined, a clearance key is generated at 228 .
- a key generator 244 receives one or more parameters 242 controlling the security level determined at 226 of FIG. 2B to generate a sequence of alpha-numeric characters or binary numbers as a key.
- a key generator 244 receives one or more parameters 242 controlling the security level determined at 226 of FIG. 2B to generate a sequence of alpha-numeric characters or binary numbers as a key.
- a secret-key cryptosystem or a public-key cryptosystem one needs a good source of random numbers for key generation.
- the main features of a good source are that it produces numbers that are unknown and unpredictable by potential adversaries.
- random numbers can be obtained from a physical process.
- Another approach is to use a pseudo-random number generator fed by a random seed.
- the generator 244 is configured to generate a clearance key of proper security level.
- the key generator 244 generates keys 246 of different lengths or forms, each of the keys 246 corresponds to a security level, such as level 1 (highest security), level 2 , . . . , level N (lowest security).
- each of the keys 246 generated by the key generator 244 is embedded with a signature signifying a security level. Other methods of specifying a security level of a clearance key are possible.
- each clearance key with a certain security level can only access secured files classified in the same security level
- a clearance key in level 1 i.e., the highest security level primarily designated to secured files classified as “top secret”
- a clearance key in level 2 can be used to access all secured classified files 248 except for those classified as “top secret”.
- a clearance key in level N can be only used to access secured files in security level N.
- FIG. 2D shows a diagram of generating a clearance key according to another embodiment of the present invention.
- the key generator 244 receives one or more parameters 242 controlling the security level determined at 226 of FIG. 2B to generate a number of sets of alphanumeric or binary numbers as a primary key 246 and auxiliary keys 247 .
- the primary key 246 is the one being requested, generated in accordance with the determined security level and can be used to facilitate the access to a secured file classified at a security or confidentiality level.
- the auxiliary keys are those keys generated to facilitate the access to secured files classified less than the security or confidentiality level. As shown in the figure, it is assumed that the primary key 246 is for accessing a secured file classified at level 2 .
- the auxiliary keys 247 can be respectively used to access secured files classified level 3 , level 4 , . . . to level N, all less than level 2 in terms of security or confidentiality.
- the following description is based on FIG. 2 C and can be readily applied to FIGS. 2 D.
- the clearance key is associated with the account at 230 so that the user will use the correct key to access a secured file that requires a clearance key.
- the process 220 now awaits any call for the clearance key at 232 .
- the clearance key may be stored locally or remotely and retrievlable only when there is a need for it to access a classified secured file.
- the clearance key can only be retrievlable when a user passes a secondary authentication means. For example, a user is entitled to access certain secured files classified at least at a security level.
- the clearance key associated with the user may be configured to be protected by means of secondary authentication, such as biometric information verification or a second password, to increase security level of the clearance key.
- secondary authentication such as biometric information verification or a second password
- the clearance key is not needed and therefore will not be released to or activated for the user.
- the process 220 goes to 234 , wherein the clearance key is released to the user to facilitate the retrieval of the file key in the secured file, provided the user has furnished necessary information or passed secondary authentication if needed.
- Clearance keys provide flexibilities for a security system to control access by authorized users to secured files that are classified accordingly. However, when levels of the security are fixed, the flexibilities are limited. As one of the features in the present invention, the levels of security can be added or adjusted up or down in a security system without compromising the security of the secured files that have been previously classified.
- FIG. 3A illustrates security levels 302 in a security system employed in an enterprise.
- N there are N levels of security for secured files under the security system, where N is a finite integer, each level requires a set of security parameters to access secured files classified to the level or other levels below this level.
- a secured file SF is classified at security level 2 .
- users in a designated group G 2 shall posses at least two keys, a user key (e.g., UK 2 ) and a clearance key (e.g., CK 2 ) corresponding to the security level 2 .
- the designated group includes a user or users authorized to access the secured files classified at this level or levels below this level.
- the user key for each of the users may not be necessary identical, as one user may be from one user group and another user may be from a different group.
- the access relationship may be expressed as: SF ⁇ (group, security-level, CK), which means a secured and classified file SF can be accessed with valid parameters of a designated group, a security-level, a clearance key.
- SF ⁇ G 2 , level2, C ⁇
- G 2 security-level
- C ⁇ means that users in a group designated as G 2 can access secured file classed at level 2 with a clearance key CK 2 , provided that each of the users in G 2 has a valid user key.
- SF ⁇ (G 2 , level1, level2, CK 2 ) means that users in a group designated as G 2 can access secured files classified at level 1 or level 2 with a clearance key CK 2 , provided that each of the users in G 2 has a valid user key.
- the first access relationship indicates that the secured file SF can only be accessed by users in a group G 2 authorized to access secured files classified at the security level 2 .
- the second access relationship indicates that secured files classified at the security level 2 or one level below the security level 2 can be accessed by users authorized to access secured files classified at the security level 2 .
- either one of the access relationships may be implemented.
- the first access relationship is shown in the figures and the following description is based on the first access relationship.
- the security level 1 is the most restrictive level. Since the added level 304 is less restrictive than the security level 1 but more restrictive than level 2 , as shown in FIG. 3A , the added level 304 is thus classified as a new security level 2 308 .
- the rest of the original security levels, except for the security level 1 are reorganized, creating N+ 1 levels of security 310 and a new access relationship SF ⁇ (GX, level 2 , CKX), where GX is a newly authorized group to be permitted to access secured files at the security level 2 with a user key and the newly created clearance key CKX.
- the security levels are renumbered or remapped. If the original access relationship is SF ⁇ (G 2 , level 2 , CK 2 ), there is now SF ⁇ (G 3 , level 3 , CK 2 ), namely the original security level 2 is mapped to as security level 3 .
- FIG. 3 B and FIG. 3C each illustrate a case in which a security level is folded into another security level.
- the three security levels 320 are to be folded into two security levels 322 or 324 .
- FIG. 3B shows the security levels 320 being folded up to an immediate next security level above
- FIG. 3C shows the security levels 322 being folded down to an immediate next security level below.
- the security level 2 is to be folded into the security level 1 , a higher security level.
- the authorization i.e., security parameters
- the deleted security level i.e., security level 2
- the original access relationships i.e., security parameters
- those secured files classified at security level 2 can still be accessed by those with proper access privilege.
- FIG. 3C shows the security level 2 is being folded to the security level 3 .
- the authorization i.e., security parameters
- the deleted security level i.e., security level 2
- the original access relationships :
- those secured files classified at security level 2 can still be accessed by those with proper access privilege.
- FIG. 4A shows a flowchart or process 400 of inserting a new security level into N security levels according to one embodiment of the present invention.
- the process 400 can be implemented in software, hardware or both of software and hardware.
- the process 400 is executed in a security system employed to manage secured files for an enterprise or a group of collaborative business entities.
- the process 400 awaits a request to insert a new security level into N existing security levels.
- N For example, a system was configured to manage secured files classified respectively in accordance with one of N security levels. In other words, there are N security levels in the system. For some reason, the system needs to be configured to manage N+1 security levels, namely a security level is to be added into the N security levels.
- the process 400 determines how restrictive the new security level is with respect to the N security level at 404 . It is assumed that the 1 st security level in the N security levels is most restrictive while the Nth security level is least restrictive.
- the relative restrictiveness of the new security level is a relative position in the stack of the N security levels, indicating how less or more restrictive with respect to the 1 st security level or the Nth security level.
- a set of security parameters is generated for the new security level.
- the security parameters include at least a clearance key and a relative security level (e.g., a tier rank).
- the clearance key may be respectively generated in accordance with FIG. 2C or FIG. 2D or other means known to those skilled in the art.
- the clearance key is associated with the new security level, and a group of users are then authorized to access secured files classified at this new security level.
- the new security level is now created in the original N security levels, resulting N+1 security levels. Without implicating the accessibility to secured files classified at other security levels, the security levels below the new security level are mapped accordingly. For example, an ith security level in the original N security levels now becomes an (i+1) security level and the corresponding security parameters are also shifted accordingly. In another perspective, SF ⁇ (Gi, level i, CKi) is now SF ⁇ (G(i+1), level (i+1), CKi).
- a new set of security levels is created, which does not implicate the accessibility to secured files originally classified and the originally authenticated users are still able to access the secured files they are entitled to.
- FIG. 4B is provided to further understand FIG. 4A with respect to one embodiment of the present invention and shows that a table 420 include clearance keys, each for a security level.
- a set of parameters 422 for a new security level X is generated. It is assumed that the new security level X is to be inserted between security levels 1 and 2 .
- the table 424 shows the relative position of the new security level in the original N security levels in a system.
- the table 426 shows reordering of the security levels to accommodate the new level that is now with a tier rank being 2 and the corresponding clearance keys are respectively associated with their original ranks. As a result, the secured files classified per the original security levels are still accessible.
- the user when an authorized user logins into the system, with the login information in reference to a group, the user is granted at least two keys (a corresponding clearance key and a user key) such that the user can access secured files classified at the granted security level or any levels below this security level.
- the user when an authorized user logins into the system, with the login information in reference to a group, the user is granted all keys pairs the user is entitled to such that the user can access secured files classified at this security level or any levels below this security level.
- “granting” herein does not necessarily means only that the user receives the keys from the system.
- one or more of the keys or part or whole of the keys may be stored in a local or remote machine and caused to be activated for use only after the user is authenticated.
- FIG. 4C shows a flowchart or process 420 of deleting a security level out of N security levels according to one embodiment of the present invention.
- One of the features of the process 420 is to fold the deleted security level up or down to a next immediate security level so that users originally authorized to access secured files classified at the deleted security level can still access these secured files.
- the process 420 can be implemented in software, hardware or both of software and hardware. In a typical application, the process 420 is executed in a security system employed to manage secured files for an enterprise or a group of collaborative business entities.
- the process 420 awaits a request to delete a security level out of N existing security levels.
- a system was configured to manage secured files classified respectively in accordance with one of N security levels. In other words, there are N security levels in the system. For some reason, the system needs to be configured to manage N ⁇ 1 security levels, namely one of the N security levels is to be deleted.
- the process 420 determines at 424 whether the ith security level is the most restrictive. It is assumed that the 1st security level in the N security levels is most restrictive while the Nth security level is least restrictive. Accordingly, the process 420 determines at 424 whether the security level to be removed is the 1st security level. If it is indeed the 1st security level, the request is denied.
- 424 is not a limitation in the present invention and it can be folded down to a next immediate level. According to one embodiment, it is designed to suit in a more practical situation. In general, it is just not desirable to have a most restrictive security level to be deleted. In some other case, it is also not desirable to have a least restrictive security level to be deleted as well. Optionally, another checking may be employed in the process 420 to determine at 424 whether the security level to be removed is the Nth security level.
- the security level to be deleted is to be folded up or down to a next immediate security level.
- an ith security level to be deleted can be merged with (i ⁇ 1)th security level or (i+1)th security level.
- the security parameters such as the keys and the group designations shall be retained.
- the security parameters for the ith security level are transferred or updated accordingly.
- the security parameters for the ith security level are merged with those for the (i ⁇ 1)th security level
- the security parameters for the ith security level are merged with those for the (i+1)th security level.
- the security levels are reordered, for example from security levels 1 to N to 1 to (N ⁇ 1).
- FIG. 5A shows an exemplary implementation 500 of dropping an ith level out of N existing levels by folding the ith level to (i—i)th level and may be understood in conjunction with FIG. 5 B and FIG. 5C.
- a table 510 in FIG. 5B shows that there are N security levels labeled as Level 1 , 2 , . . . , N, where Level 1 is most restricted and Level N is least restricted.
- a security clearance key is associated with one of the security levels.
- Each of the security levels may mean literally a type of security, such as “top secret”, “very secret”, . . . “insignificant”.
- Each of the N security levels is also identified by an identifier.
- the identifier is a sequence of digits (e.g.
- a hexadecimal number generated in a system.
- the identifier B 5 C indicates security level 1
- the identifier CD 7 indicates security level 4 .
- it is assumed that the ith security level to be dropped is the security level 4 .
- an identifier of the security level above the one being dropped is located, namely the identifier of the (i ⁇ 1)th security level.
- FIG. 5C shows a corresponding mapping table 512 which may be referred to as clearance mapping table, in which two IDs (deletedID and currentD) now have two entries, each being one of the two identifiers.
- the mapping table 512 is updated. There is no operation since there are any entries previously in the table 512 .
- the user who is previously authorized to access secured files classified at CD 7 is updated. According to one embodiment, a notification is sent to the user or users who may have been affected by dropping CD 7 to cause the original clearance key (i.e., CK 4 ) to be updated or exchanged with another clearance key (e.g., CD 3 for FF 5 ). According to another embodiment, when a secured file classified at CD 7 is accessed, the original clearance key is used to access the file.
- an updated clearance key (i.e., the key for FF 5 ) is effectuated in accordance with CurrentID.
- the updating at 508 can be configured to be carried out transparently.
- Level 3 another security level
- the identifier (A 92 ) of the security level above Level 3 is located.
- the table 512 needs to be updated. Since there is are entries from a previous deletion of one security level, these entries are preferably updated, thus the CurrentID is assigned to be A 92 as well as shown in FIG. 5 C.
- the affected user or users are updated at 508 so that these users can still access the secured files classified at FF 5 .
- FIGS. 5A , 5 B and 5 C show one exemplary implementation of folding up one deleted security level. Given the detailed description herein, other implementations including those to fold down a deleted security level can be readily developed by those skilled in art.
- One of them is the mechanism provided to regroup security levels per a specific requirement without implicating the accessibility to secured files classified in accordance with the existing security levels.
- Another one of them is that a security level can be removed from a set of existing security levels while the security parameters for the security level to be deleted are either folded up or down to an immediate next security level.
- the security parameters for the immediate next security level are augmented to include those for the security level to be deleted such that the secured files classified at the security level to be deleted can still be accessed by those with proper clearance levels.
Abstract
Description
Claims (35)
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