CA2049083A1 - Information Processing Apparatus with Replaceable Security Element - Google Patents

Information Processing Apparatus with Replaceable Security Element

Info

Publication number
CA2049083A1
CA2049083A1 CA2049083A CA2049083A CA2049083A1 CA 2049083 A1 CA2049083 A1 CA 2049083A1 CA 2049083 A CA2049083 A CA 2049083A CA 2049083 A CA2049083 A CA 2049083A CA 2049083 A1 CA2049083 A1 CA 2049083A1
Authority
CA
Canada
Prior art keywords
information processor
security element
processing apparatus
information processing
replaceable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2049083A
Other languages
French (fr)
Other versions
CA2049083C (en
Inventor
James Neil Esserman
Paul Moroney
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Arris Technology Inc
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=24273628&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=CA2049083(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Individual filed Critical Individual
Publication of CA2049083A1 publication Critical patent/CA2049083A1/en
Application granted granted Critical
Publication of CA2049083C publication Critical patent/CA2049083C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
    • H04L9/0861—Generation of secret information including derivation or calculation of cryptographic keys or passwords
    • H04L9/0877—Generation of secret information including derivation or calculation of cryptographic keys or passwords using additional device, e.g. trusted platform module [TPM], smartcard, USB or hardware security module [HSM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
    • H04L9/0891—Revocation or update of secret information, e.g. encryption key update or rekeying
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
    • H04N21/4367—Establishing a secure communication between the client and a peripheral device or smart card
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
    • H04N21/4405—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving video stream decryption
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
    • H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence

Abstract

A field upgradeable security system deciphers signals received from a communication network. An information processor (10) includes a receptacle for receiving a replaceable security element (12). The replaceable security element generates a working key (WK) necessary to the operation of the information processor. The working key is communicated to the information processor encrypted under a secret key (A(M)). The information processor decrypts the encrypted working key for use in deciphering a received communication signal. Additional layers of encryption (A(C), U(M), U(C)) can be added to the communications between the information processor and security element to increase the level of security. <IMAGE>
CA002049083A 1990-08-17 1991-08-13 Information processing apparatus with replaceable security element Expired - Lifetime CA2049083C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/568,990 1990-08-17
US07/568,990 US5111504A (en) 1990-08-17 1990-08-17 Information processing apparatus with replaceable security element

Publications (2)

Publication Number Publication Date
CA2049083A1 true CA2049083A1 (en) 1992-02-18
CA2049083C CA2049083C (en) 2000-01-25

Family

ID=24273628

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002049083A Expired - Lifetime CA2049083C (en) 1990-08-17 1991-08-13 Information processing apparatus with replaceable security element

Country Status (11)

Country Link
US (1) US5111504A (en)
EP (1) EP0471373B1 (en)
JP (1) JP2930149B2 (en)
KR (1) KR100188425B1 (en)
AT (1) ATE185461T1 (en)
AU (1) AU632704B2 (en)
CA (1) CA2049083C (en)
DE (1) DE69131680T2 (en)
ES (1) ES2137923T3 (en)
IE (1) IE912876A1 (en)
NO (1) NO179160C (en)

Families Citing this family (101)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5237610A (en) * 1990-02-01 1993-08-17 Scientific-Atlanta, Inc. Independent external security module for a digitally upgradeable television signal decoder
JP3065738B2 (en) * 1991-10-11 2000-07-17 株式会社東芝 Computer system
FI94008C (en) * 1992-09-04 1995-06-26 Salon Televisiotehdas Oy Decoder system for a video signal
US5367516A (en) * 1993-03-17 1994-11-22 Miller William J Method and apparatus for signal transmission and reception
US5995539A (en) 1993-03-17 1999-11-30 Miller; William J. Method and apparatus for signal transmission and reception
US5434850A (en) 1993-06-17 1995-07-18 Skydata Corporation Frame relay protocol-based multiplex switching scheme for satellite
US6771617B1 (en) 1993-06-17 2004-08-03 Gilat Satellite Networks, Ltd. Frame relay protocol-based multiplex switching scheme for satellite mesh network
US5787172A (en) * 1994-02-24 1998-07-28 The Merdan Group, Inc. Apparatus and method for establishing a cryptographic link between elements of a system
EP0907270B1 (en) 1994-02-24 2009-04-15 Comcast Cable Holdings, LLC Apparatus and method for establishing a cryptographic link between elements of a system
US5426701A (en) * 1994-02-28 1995-06-20 General Instrument Corporation Of Delaware Cable television converter box with a smart card connector underneath
US6298441B1 (en) 1994-03-10 2001-10-02 News Datacom Ltd. Secure document access system
IL111151A (en) * 1994-10-03 1998-09-24 News Datacom Ltd Secure access systems
ES2117495B1 (en) * 1994-05-18 1999-04-01 Penta 3 S A CRYPTOGRAPHIC SYSTEM.
JPH09510596A (en) 1994-06-08 1997-10-21 エイチイー・ホールディングス・インコーポレーテッド・ディー ビーエー・ヒューズ・エレクトロニクス Apparatus and method for hybrid network access
US6473793B1 (en) * 1994-06-08 2002-10-29 Hughes Electronics Corporation Method and apparatus for selectively allocating and enforcing bandwidth usage requirements on network users
US6701370B1 (en) 1994-06-08 2004-03-02 Hughes Electronics Corporation Network system with TCP/IP protocol spoofing
DK0765501T3 (en) * 1994-06-15 1999-09-27 Thomson Consumer Electronics Chip card message transfer without the intervention of a microprocessor
DE4420970A1 (en) * 1994-06-16 1995-12-21 Esd Vermoegensverwaltungsgesel Decryption device for decryption algorithms and method for performing the encryption and decryption thereof
MY125706A (en) * 1994-08-19 2006-08-30 Thomson Consumer Electronics High speed signal processing smart card
US5796829A (en) * 1994-09-09 1998-08-18 The Titan Corporation Conditional access system
US5699384A (en) * 1994-11-14 1997-12-16 Hughes Electronics Apparatus and method for satellite receiver computer adaptor card
US5727065A (en) * 1994-11-14 1998-03-10 Hughes Electronics Deferred billing, broadcast, electronic document distribution system and method
US5652795A (en) * 1994-11-14 1997-07-29 Hughes Electronics Method and apparatus for an adapter card providing conditional access in a communication system
KR100332743B1 (en) 1994-11-26 2002-11-07 엘지전자주식회사 Device and method for preventing illegal copy or unauthorized watching of digital image
US5485577A (en) * 1994-12-16 1996-01-16 General Instrument Corporation Of Delaware Method and apparatus for incremental delivery of access rights
US5604801A (en) * 1995-02-03 1997-02-18 International Business Machines Corporation Public key data communications system under control of a portable security device
US5682428A (en) * 1995-02-13 1997-10-28 Eta Technologies Corporation Personal access management system
US5778068A (en) * 1995-02-13 1998-07-07 Eta Technologies Corporation Personal access management system
US5692049A (en) * 1995-02-13 1997-11-25 Eta Technologies Corporation Personal access management system
US5619574A (en) * 1995-02-13 1997-04-08 Eta Technologies Corporation Personal access management system
US5610980A (en) * 1995-02-13 1997-03-11 Eta Technologies Corporation Method and apparatus for re-initializing a processing device and a storage device
US5689564A (en) * 1995-02-13 1997-11-18 Eta Technologies Corporation Personal access management system
US5694472A (en) * 1995-02-13 1997-12-02 Eta Technologies Corporation Personal access management system
US5696825A (en) * 1995-02-13 1997-12-09 Eta Technologies Corporation Personal access management system
AU702649B2 (en) * 1995-05-12 1999-02-25 Rovi Solutions Corporation Video media security and tracking system
US5852290A (en) * 1995-08-04 1998-12-22 Thomson Consumer Electronics, Inc. Smart-card based access control system with improved security
US6035037A (en) * 1995-08-04 2000-03-07 Thomson Electronic Consumers, Inc. System for processing a video signal via series-connected high speed signal processing smart cards
US5805702A (en) * 1995-09-29 1998-09-08 Dallas Semiconductor Corporation Method, apparatus, and system for transferring units of value
US5638448A (en) * 1995-10-24 1997-06-10 Nguyen; Minhtam C. Network with secure communications sessions
US5689566A (en) * 1995-10-24 1997-11-18 Nguyen; Minhtam C. Network with secure communications sessions
JPH09233066A (en) * 1996-02-23 1997-09-05 Sony Corp Encryption/decryption method and its device
EP0826288B1 (en) 1996-03-18 2000-09-13 News Datacom Ltd. Smart card chaining in pay television systems
HRP970160A2 (en) * 1996-04-03 1998-02-28 Digco B V Method for providing a secure communication between two devices and application of this method
JP3783800B2 (en) * 1996-08-09 2006-06-07 富士通株式会社 Encryption / decryption device and method using programmable logic device / device
US5802175A (en) * 1996-09-18 1998-09-01 Kara; Salim G. Computer file backup encryption system and method
US5898680A (en) * 1996-11-05 1999-04-27 Worldspace, Inc. System for providing location-specific data to a user
FR2755809B1 (en) * 1996-11-13 1999-05-28 Thomson Multimedia Sa METHOD FOR PROTECTING INFORMATION TRANSMITTED FROM A SECURITY ELEMENT TO A DECODER AND PROTECTION SYSTEM USING SUCH A METHOD
EP0858184A3 (en) 1997-02-07 1999-09-01 Nds Limited Digital recording protection system
IL120174A (en) * 1997-02-07 1999-10-28 News Datacom Ltd Digital recording protection system
US6064989A (en) * 1997-05-29 2000-05-16 Pitney Bowes Inc. Synchronization of cryptographic keys between two modules of a distributed system
US5991879A (en) * 1997-10-23 1999-11-23 Bull Hn Information Systems Inc. Method for gradual deployment of user-access security within a data processing system
US7778418B1 (en) * 1998-01-08 2010-08-17 Samsung Electronics Co., Ltd. System and method for copy protection for digital signals
JP3659791B2 (en) * 1998-03-23 2005-06-15 インターナショナル・ビジネス・マシーンズ・コーポレーション Method and system for generating a small time key
KR100311200B1 (en) * 1998-12-08 2002-02-19 성재갑 Low Viscosity Mini Emulsion Cosmetic Composition With Ceramide
US6934255B1 (en) * 1999-02-02 2005-08-23 Packeteer, Inc. Internet over satellite apparatus
WO2000057290A1 (en) * 1999-03-19 2000-09-28 Hitachi, Ltd. Information processor
US7058803B2 (en) 2002-05-22 2006-06-06 Broadcom Corporation System and method for protecting transport stream content
US6697489B1 (en) 1999-03-30 2004-02-24 Sony Corporation Method and apparatus for securing control words
US7730300B2 (en) 1999-03-30 2010-06-01 Sony Corporation Method and apparatus for protecting the transfer of data
AU5730200A (en) * 1999-06-08 2000-12-28 General Instrument Corporation Cryptographic processing system
US7039614B1 (en) 1999-11-09 2006-05-02 Sony Corporation Method for simulcrypting scrambled data to a plurality of conditional access devices
JP2001318768A (en) * 2000-03-02 2001-11-16 Sony Computer Entertainment Inc Entertainment device, component therefor, method for loading digital information with entertainment device and computer program
EP1134977A1 (en) * 2000-03-06 2001-09-19 Irdeto Access B.V. Method and system for providing copies of scrambled content with unique watermarks, and system for descrambling scrambled content
JP2002014872A (en) * 2000-06-29 2002-01-18 Fujitsu Ltd Cipher controller
US8140859B1 (en) 2000-07-21 2012-03-20 The Directv Group, Inc. Secure storage and replay of media programs using a hard-paired receiver and storage device
TW571245B (en) * 2000-09-15 2004-01-11 Nagracard Sa Multi-ports card
US7231044B2 (en) * 2000-10-11 2007-06-12 Digital Authentication Technologies, Inc. Method and apparatus for real-time digital certification of electronic files and transactions using entropy factors
US20020048371A1 (en) 2000-10-24 2002-04-25 Ryuichi Iwamura Method and system for secure digital decoder with secure key distribution
US20020146125A1 (en) * 2001-03-14 2002-10-10 Ahmet Eskicioglu CA system for broadcast DTV using multiple keys for different service providers and service areas
US7280658B2 (en) * 2001-06-01 2007-10-09 International Business Machines Corporation Systems, methods, and computer program products for accelerated dynamic protection of data
US7124303B2 (en) 2001-06-06 2006-10-17 Sony Corporation Elementary stream partial encryption
US7895616B2 (en) 2001-06-06 2011-02-22 Sony Corporation Reconstitution of program streams split across multiple packet identifiers
US7747853B2 (en) 2001-06-06 2010-06-29 Sony Corporation IP delivery of secure digital content
US7173966B2 (en) * 2001-08-31 2007-02-06 Broadband Physics, Inc. Compensation for non-linear distortion in a modem receiver
US6735264B2 (en) 2001-08-31 2004-05-11 Rainmaker Technologies, Inc. Compensation for non-linear distortion in a modem receiver
US7409562B2 (en) * 2001-09-21 2008-08-05 The Directv Group, Inc. Method and apparatus for encrypting media programs for later purchase and viewing
US7823174B2 (en) 2002-01-02 2010-10-26 Sony Corporation Macro-block based content replacement by PID mapping
US7765567B2 (en) 2002-01-02 2010-07-27 Sony Corporation Content replacement by PID mapping
US20030131349A1 (en) * 2002-01-04 2003-07-10 General Instrument Corporation Methods and systems for managing and collecting impulse pay-per-view data in smart card enabled television terminals
US7415440B1 (en) 2002-02-22 2008-08-19 Entriq, Inc. Method and system to provide secure key selection using a secure device in a watercrypting environment
US8082588B2 (en) * 2002-03-15 2011-12-20 Nagravision S.A. Secured storage method of encrypted data on a personal digital recorder
US7305555B2 (en) * 2002-03-27 2007-12-04 General Instrument Corporation Smart card mating protocol
US7343398B1 (en) 2002-09-04 2008-03-11 Packeteer, Inc. Methods, apparatuses and systems for transparently intermediating network traffic over connection-based authentication protocols
US8818896B2 (en) 2002-09-09 2014-08-26 Sony Corporation Selective encryption with coverage encryption
US8572408B2 (en) 2002-11-05 2013-10-29 Sony Corporation Digital rights management of a digital device
US7724907B2 (en) 2002-11-05 2010-05-25 Sony Corporation Mechanism for protecting the transfer of digital content
US8667525B2 (en) 2002-12-13 2014-03-04 Sony Corporation Targeted advertisement selection from a digital stream
US8645988B2 (en) 2002-12-13 2014-02-04 Sony Corporation Content personalization for digital content
US7132953B2 (en) * 2003-06-26 2006-11-07 Lear Corporation Spring sensor assembly for a vehicle seat cushion
US7853980B2 (en) 2003-10-31 2010-12-14 Sony Corporation Bi-directional indices for trick mode video-on-demand
FR2871017B1 (en) 2004-05-28 2008-02-29 Viaccess Sa METHOD FOR DIFFUSION OF DIGITAL DATA TO A PARK OF TARGET RECEIVING TERMINALS
US8041190B2 (en) 2004-12-15 2011-10-18 Sony Corporation System and method for the creation, synchronization and delivery of alternate content
US7895617B2 (en) 2004-12-15 2011-02-22 Sony Corporation Content substitution editor
US7386128B2 (en) * 2004-12-29 2008-06-10 General Instrument Corporation Conditional access system providing access to multiple programs or services
US8639946B2 (en) * 2005-06-24 2014-01-28 Sigmatel, Inc. System and method of using a protected non-volatile memory
GB2429308B (en) * 2005-07-29 2007-08-01 Hewlett Packard Development Co Data transfer device
US9325944B2 (en) 2005-08-11 2016-04-26 The Directv Group, Inc. Secure delivery of program content via a removable storage medium
US7761591B2 (en) 2005-12-16 2010-07-20 Jean A. Graham Central work-product management system for coordinated collaboration with remote users
US8185921B2 (en) 2006-02-28 2012-05-22 Sony Corporation Parental control of displayed content using closed captioning
US8775319B2 (en) 2006-05-15 2014-07-08 The Directv Group, Inc. Secure content transfer systems and methods to operate the same
US20180063128A1 (en) * 2016-08-31 2018-03-01 Motorola Solutions, Inc Method for automatically deleting a user password upon successful use of a multi-factor authentication modality

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4802214A (en) * 1982-04-23 1989-01-31 Eagle Comtronics, Inc. Method and apparatus for identifying and rendering operative particular descramblers in a television signal scrambling system
US4613901A (en) * 1983-05-27 1986-09-23 M/A-Com Linkabit, Inc. Signal encryption and distribution system for controlling scrambling and selective remote descrambling of television signals
WO1985000491A1 (en) * 1983-06-30 1985-01-31 Independent Broadcasting Authority Encrypted broadcast television system
CA1219930A (en) * 1983-07-21 1987-03-31 Takashi Kamitake Information transmission system
US4663664A (en) * 1983-10-31 1987-05-05 R. F. Monolithics, Inc. Electronic ticket method and apparatus for television signal scrambling and descrambling
GB2151886A (en) * 1983-12-21 1985-07-24 British Broadcasting Corp Conditional-access broadcast transmission
JPS60160492A (en) * 1984-01-31 1985-08-22 Toshiba Corp Ic card
US4634808A (en) * 1984-03-15 1987-01-06 M/A-Com Government Systems, Inc. Descrambler subscriber key production system utilizing key seeds stored in descrambler
US4712238A (en) * 1984-06-08 1987-12-08 M/A-Com Government Systems, Inc. Selective-subscription descrambling
US4694491A (en) * 1985-03-11 1987-09-15 General Instrument Corp. Cryptographic system using interchangeable key blocks and selectable key fragments
CA1270339A (en) * 1985-06-24 1990-06-12 Katsuya Nakagawa System for determining a truth of software in an information processing apparatus
JPS6229333A (en) * 1985-07-31 1987-02-07 Hitachi Ltd System for setting ciphering key
ES2169054T3 (en) 1986-04-18 2002-07-01 Nagra Plus Sa PAYMENT TELEVISION SYSTEM.
US4890321A (en) * 1986-07-08 1989-12-26 Scientific Atlanta, Inc. Communications format for a subscription television system permitting transmission of individual text messages to subscribers
JPS63113729A (en) * 1986-10-31 1988-05-18 Toppan Printing Co Ltd Ic card
JPS63181088A (en) * 1987-01-23 1988-07-26 Toshiba Corp Portable electronic equipment
US4864615A (en) * 1988-05-27 1989-09-05 General Instrument Corporation Reproduction of secure keys by using distributed key generation data

Also Published As

Publication number Publication date
EP0471373A3 (en) 1992-07-29
JPH04288743A (en) 1992-10-13
EP0471373B1 (en) 1999-10-06
DE69131680T2 (en) 2000-05-11
KR100188425B1 (en) 1999-06-01
DE69131680D1 (en) 1999-11-11
IE912876A1 (en) 1992-02-26
NO913191D0 (en) 1991-08-15
AU8241291A (en) 1992-02-20
NO913191L (en) 1992-02-18
NO179160B (en) 1996-05-06
KR920005645A (en) 1992-03-28
JP2930149B2 (en) 1999-08-03
EP0471373A2 (en) 1992-02-19
CA2049083C (en) 2000-01-25
US5111504A (en) 1992-05-05
ES2137923T3 (en) 2000-01-01
NO179160C (en) 1996-08-14
AU632704B2 (en) 1993-01-07
ATE185461T1 (en) 1999-10-15

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Effective date: 20110813