WO2003081780A3 - Hierarchical identity-based encryption and signature schemes - Google Patents

Hierarchical identity-based encryption and signature schemes Download PDF

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Publication number
WO2003081780A3
WO2003081780A3 PCT/US2003/008010 US0308010W WO03081780A3 WO 2003081780 A3 WO2003081780 A3 WO 2003081780A3 US 0308010 W US0308010 W US 0308010W WO 03081780 A3 WO03081780 A3 WO 03081780A3
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WO
WIPO (PCT)
Prior art keywords
level
key generation
recipient
root
pkg
Prior art date
Application number
PCT/US2003/008010
Other languages
French (fr)
Other versions
WO2003081780A2 (en
Inventor
Craig B Gentry
Alice Silverberg
Original Assignee
Docomo Comm Lab Usa Inc
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
Application filed by Docomo Comm Lab Usa Inc filed Critical Docomo Comm Lab Usa Inc
Priority to AU2003214189A priority Critical patent/AU2003214189A1/en
Priority to EP03711597A priority patent/EP1495573B1/en
Priority to CN038039109A priority patent/CN1633774B/en
Priority to DE60325575T priority patent/DE60325575D1/en
Priority to JP2003579369A priority patent/JP4405810B2/en
Publication of WO2003081780A2 publication Critical patent/WO2003081780A2/en
Publication of WO2003081780A3 publication Critical patent/WO2003081780A3/en

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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
    • H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
    • H04L9/0819—Key transport or distribution, i.e. key establishment techniques where one party creates or otherwise obtains a secret value, and securely transfers it to the other(s)
    • H04L9/083—Key transport or distribution, i.e. key establishment techniques where one party creates or otherwise obtains a secret value, and securely transfers it to the other(s) involving central third party, e.g. key distribution center [KDC] or trusted third party [TTP]
    • H04L9/0833—Key transport or distribution, i.e. key establishment techniques where one party creates or otherwise obtains a secret value, and securely transfers it to the other(s) involving central third party, e.g. key distribution center [KDC] or trusted third party [TTP] involving conference or group key
    • H04L9/0836—Key transport or distribution, i.e. key establishment techniques where one party creates or otherwise obtains a secret value, and securely transfers it to the other(s) involving central third party, e.g. key distribution center [KDC] or trusted third party [TTP] involving conference or group key using tree structure or hierarchical structure
    • 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
    • H04L9/006—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols involving public key infrastructure [PKI] trust models
    • H04L9/007—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols involving public key infrastructure [PKI] trust models involving hierarchical structures
    • 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
    • H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
    • H04L9/0838—Key agreement, i.e. key establishment technique in which a shared key is derived by parties as a function of information contributed by, or associated with, each of these
    • H04L9/0847—Key agreement, i.e. key establishment technique in which a shared key is derived by parties as a function of information contributed by, or associated with, each of these involving identity based encryption [IBE] schemes
    • 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
    • H04L9/30—Public key, i.e. encryption algorithm being computationally infeasible to invert or user's encryption keys not requiring secrecy
    • H04L9/3066—Public key, i.e. encryption algorithm being computationally infeasible to invert or user's encryption keys not requiring secrecy involving algebraic varieties, e.g. elliptic or hyper-elliptic curves
    • H04L9/3073—Public key, i.e. encryption algorithm being computationally infeasible to invert or user's encryption keys not requiring secrecy involving algebraic varieties, e.g. elliptic or hyper-elliptic curves involving pairings, e.g. identity based encryption [IBE], bilinear mappings or bilinear pairings, e.g. Weil or Tate pairing
    • 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
    • H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
    • H04L9/3247—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials involving digital signatures
    • 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
    • H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
    • H04L9/3247—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials involving digital signatures
    • H04L9/3252—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials involving digital signatures using DSA or related signature schemes, e.g. elliptic based signatures, ElGamal or Schnorr schemes

Abstract

Methods are provided for encoding and decoding a digital message between a sender and a recipient in a system including a plurality of private key generators ('PKGs'). The PKGs include at least a root PKG and n lower-level PKG in the hierarchy between the root PKG and the recipient. A root key generation secret is selected and is known only to the root PKG (102). A root key generation parameter is generated based on the root key generation secret (104). A lower-level key generation secret is selected for each of the n lower-level PKGs, wherein each lower-level key generation secret is known only to its associated lower-level PKG (106). A lower-level key generation parameter also is generated for each of the n lower-level PKGs using at least the lower-level key generation secret for its associated lower-level private key generator (108). The message is encoded to form a ciphertext using at least the root key generation parameter and recipient identity information associated with the recipient (110). A recipient private key is generated such that the recipient private key is related to at least the root key generation secret, one or more of the n lower-level key generation secrets, and the recipient identity information (112). The ciphertext is decoded to recover the message using at least the recipient private key (114).
PCT/US2003/008010 2002-03-21 2003-03-18 Hierarchical identity-based encryption and signature schemes WO2003081780A2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AU2003214189A AU2003214189A1 (en) 2002-03-21 2003-03-18 Hierarchical identity-based encryption and signature schemes
EP03711597A EP1495573B1 (en) 2002-03-21 2003-03-18 Hierarchical identity-based encryption and signature schemes
CN038039109A CN1633774B (en) 2002-03-21 2003-03-18 Hierarchical identity-based encryption and signature schemes
DE60325575T DE60325575D1 (en) 2002-03-21 2003-03-18 HIERARCHIC BREAKDOWN OF IDENTITY BASIS AND SIGNATURE SCHEMES
JP2003579369A JP4405810B2 (en) 2002-03-21 2003-03-18 Encryption and signature scheme based on hierarchical identity

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US36629202P 2002-03-21 2002-03-21
US36619602P 2002-03-21 2002-03-21
US60/366,292 2002-03-21
US60/366,196 2002-03-21
US10/384,328 2003-03-07
US10/384,328 US7349538B2 (en) 2002-03-21 2003-03-07 Hierarchical identity-based encryption and signature schemes

Publications (2)

Publication Number Publication Date
WO2003081780A2 WO2003081780A2 (en) 2003-10-02
WO2003081780A3 true WO2003081780A3 (en) 2004-02-19

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2003/008010 WO2003081780A2 (en) 2002-03-21 2003-03-18 Hierarchical identity-based encryption and signature schemes

Country Status (8)

Country Link
US (4) US7349538B2 (en)
EP (3) EP1495573B1 (en)
JP (1) JP4405810B2 (en)
CN (1) CN1633774B (en)
AT (1) ATE419690T1 (en)
AU (1) AU2003214189A1 (en)
DE (1) DE60325575D1 (en)
WO (1) WO2003081780A2 (en)

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US7590854B2 (en) 2009-09-15
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US7349538B2 (en) 2008-03-25
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US20030179885A1 (en) 2003-09-25
EP1495573A2 (en) 2005-01-12
US20070050629A1 (en) 2007-03-01
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US7443980B2 (en) 2008-10-28
WO2003081780A2 (en) 2003-10-02
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US7337322B2 (en) 2008-02-26
US20080052521A1 (en) 2008-02-28

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