WO1995019672A3 - Cryptographic system and method with key escrow feature - Google Patents

Cryptographic system and method with key escrow feature Download PDF

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Publication number
WO1995019672A3
WO1995019672A3 PCT/US1995/000531 US9500531W WO9519672A3 WO 1995019672 A3 WO1995019672 A3 WO 1995019672A3 US 9500531 W US9500531 W US 9500531W WO 9519672 A3 WO9519672 A3 WO 9519672A3
Authority
WO
WIPO (PCT)
Prior art keywords
keys
users
valid
escrow
trusted
Prior art date
Application number
PCT/US1995/000531
Other languages
French (fr)
Other versions
WO1995019672A2 (en
Inventor
Frank W Sudia
Original Assignee
Bankers Trust Co
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
Priority to JP7519155A priority Critical patent/JPH09507729A/en
Priority to DK95908511T priority patent/DK0739560T3/en
Priority to NZ279622A priority patent/NZ279622A/en
Priority to EP95908511A priority patent/EP0739560B1/en
Application filed by Bankers Trust Co filed Critical Bankers Trust Co
Priority to DE69521413T priority patent/DE69521413T2/en
Priority to AU16803/95A priority patent/AU1680395A/en
Priority to MX9602773A priority patent/MX9602773A/en
Priority to PL95315574A priority patent/PL176458B1/en
Priority to BR9506414A priority patent/BR9506414A/en
Priority to APAP/P/1996/000811A priority patent/AP626A/en
Priority to AT95908511T priority patent/ATE202439T1/en
Priority to UA96072822A priority patent/UA41387C2/en
Publication of WO1995019672A2 publication Critical patent/WO1995019672A2/en
Publication of WO1995019672A3 publication Critical patent/WO1995019672A3/en
Priority to GR20010401508T priority patent/GR3036650T3/en

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q20/00—Payment architectures, schemes or protocols
    • G06Q20/02—Payment architectures, schemes or protocols involving a neutral party, e.g. certification authority, notary or trusted third party [TTP]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q20/00—Payment architectures, schemes or protocols
    • G06Q20/38—Payment protocols; Details thereof
    • G06Q20/382—Payment protocols; Details thereof insuring higher security of transaction
    • G06Q20/3821—Electronic credentials
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q20/00—Payment architectures, schemes or protocols
    • G06Q20/38—Payment protocols; Details thereof
    • G06Q20/382—Payment protocols; Details thereof insuring higher security of transaction
    • G06Q20/3829—Payment protocols; Details thereof insuring higher security of transaction involving key management
    • 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)
    • H04L9/0825—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) using asymmetric-key encryption or public key infrastructure [PKI], e.g. key signature or public key certificates
    • 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
    • H04L9/0841—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 Diffie-Hellman or related key agreement protocols
    • H04L9/0844—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 Diffie-Hellman or related key agreement protocols with user authentication or key authentication, e.g. ElGamal, MTI, MQV-Menezes-Qu-Vanstone protocol or Diffie-Hellman protocols using implicitly-certified keys
    • 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
    • H04L9/085—Secret sharing or secret splitting, e.g. threshold 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
    • H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
    • H04L9/088—Usage controlling of secret information, e.g. techniques for restricting cryptographic keys to pre-authorized uses, different access levels, validity of crypto-period, different key- or password length, or different strong and weak cryptographic algorithms
    • 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
    • H04L9/0894—Escrow, recovery or storing of secret information, e.g. secret key escrow or cryptographic key storage
    • 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
    • H04L9/3263—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 certificates, e.g. public key certificate [PKC] or attribute certificate [AC]; Public key infrastructure [PKI] arrangements
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F7/00—Methods or arrangements for processing data by operating upon the order or content of the data handled
    • G06F7/60—Methods or arrangements for performing computations using a digital non-denominational number representation, i.e. number representation without radix; Computing devices using combinations of denominational and non-denominational quantity representations, e.g. using difunction pulse trains, STEELE computers, phase computers
    • G06F7/72—Methods or arrangements for performing computations using a digital non-denominational number representation, i.e. number representation without radix; Computing devices using combinations of denominational and non-denominational quantity representations, e.g. using difunction pulse trains, STEELE computers, phase computers using residue arithmetic
    • G06F7/724—Finite field arithmetic
    • G06F7/725—Finite field arithmetic over elliptic curves

Abstract

The invention provides a cryptographic system and method with a key escrow feature that uses a method for verifiably splitting users' private encryption keys into components and for sending those components to trusted agents chosen by the particular users, and provides a system that uses modern public key certificate management, enforced by a chip device that also self-certifies. In a preferred embodiment of this invention, the chip encrypts or decrypts only if certain conditions are met, namely, (1) if a valid 'sender certificate' and a valid 'recipient certificate' are input, where 'valid' means that the particular user's private decryption key is provably escrowed with a specified number of escrow agents and that the master escrow center is registered and certified by the chip manufacturer, and (2) if a valid Message Control Header is generated by the sender and validated by the recipient, thereby giving authorized investigators sufficient information with which to request and obtain the escrowed keys. A further preferred embodiment of this invention provides a method for generating verifiably trusted communications among a plurality of users, comprising the steps of escrowing at a trusted escrow center a plurality of asymmetric cryptographic keys to be used by a plurality of users; verifying each of said plurality of keys at the escrow center; certifying the authorization of each of said plurality of keys upon verification; and initiating a communication from each of said plurality of users using a respective one of said plurality of keys contingent upon said certification.
PCT/US1995/000531 1994-01-13 1995-01-13 Cryptographic system and method with key escrow feature WO1995019672A2 (en)

Priority Applications (13)

Application Number Priority Date Filing Date Title
AU16803/95A AU1680395A (en) 1994-01-13 1995-01-13 Cryptographic system and method with key escrow feature
NZ279622A NZ279622A (en) 1994-01-13 1995-01-13 Encrypted secure and verifiable communication: cryptographic keys escrowed
EP95908511A EP0739560B1 (en) 1994-01-13 1995-01-13 Cryptographic system and method with key escrow feature
PL95315574A PL176458B1 (en) 1994-01-13 1995-01-13 Method of and system for encoding with deposition of encoding keys
DE69521413T DE69521413T2 (en) 1994-01-13 1995-01-13 ENCRYPTION DEVICE AND METHOD FOR POSSIBLE SECURED KEY STORAGE
DK95908511T DK0739560T3 (en) 1994-01-13 1995-01-13 Cryptographic system and method with key deposit function
MX9602773A MX9602773A (en) 1994-01-13 1995-01-13 Cryptographic system and method with key escrow feature.
JP7519155A JPH09507729A (en) 1994-01-13 1995-01-13 Cryptographic system and method with key escrow function
BR9506414A BR9506414A (en) 1994-01-13 1995-01-13 Method for generating private, digital cryptographic communications that are proven to be reliable among a plurality of users Method for generating cryptographic communications that are proven to be reliable between a plurality of devices and Method for authorizing a trusted device to perform an electronic transaction between a first user and a second party
APAP/P/1996/000811A AP626A (en) 1994-01-13 1995-01-13 Cryptographic system and method with key escrow feature.
AT95908511T ATE202439T1 (en) 1994-01-13 1995-01-13 ENCRYPTION DEVICE AND METHOD WITH POSSIBILITY FOR SECURE CENTRAL KEY STORAGE
UA96072822A UA41387C2 (en) 1994-01-13 1995-01-13 Method for setting of true communication being checked, method for protected communication, method for renewal of micro-software, method for execution of enciphered communication and method for giving to device checked on identity of right on electron transaction
GR20010401508T GR3036650T3 (en) 1994-01-13 2001-09-18 Cryptographic system and method with key escrow feature

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US18185994A 1994-01-13 1994-01-13
US08/181,859 1994-01-13
US27220394A 1994-07-08 1994-07-08
US08/272,203 1994-07-08

Publications (2)

Publication Number Publication Date
WO1995019672A2 WO1995019672A2 (en) 1995-07-20
WO1995019672A3 true WO1995019672A3 (en) 1995-09-08

Family

ID=26877578

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1995/000531 WO1995019672A2 (en) 1994-01-13 1995-01-13 Cryptographic system and method with key escrow feature

Country Status (22)

Country Link
US (6) US5850451A (en)
EP (1) EP0739560B1 (en)
JP (4) JPH09507729A (en)
CN (1) CN1138927A (en)
AP (1) AP626A (en)
AT (1) ATE202439T1 (en)
AU (1) AU1680395A (en)
BR (1) BR9506414A (en)
CA (1) CA2176032A1 (en)
CZ (1) CZ197896A3 (en)
DE (1) DE69521413T2 (en)
DK (1) DK0739560T3 (en)
ES (1) ES2158081T3 (en)
GR (1) GR3036650T3 (en)
HU (1) HU216231B (en)
MX (1) MX9602773A (en)
NZ (2) NZ279622A (en)
OA (1) OA10456A (en)
PL (1) PL176458B1 (en)
PT (1) PT739560E (en)
UA (1) UA41387C2 (en)
WO (1) WO1995019672A2 (en)

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MICALI: "FAIR PUBLIC-KEY CRYPTOSYSTEMS", ADVANCES IN CRYPTOLOGY-CRYPTO '92, 16 August 1992 (1992-08-16), BERLIN (DE), pages 113 - 138 *

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CA2176032A1 (en) 1995-07-20
US5799086A (en) 1998-08-25
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US6009177A (en) 1999-12-28
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US5850451A (en) 1998-12-15
OA10456A (en) 2002-03-27
HU9601870D0 (en) 1996-08-28
UA41387C2 (en) 2001-09-17
WO1995019672A2 (en) 1995-07-20
HU216231B (en) 1999-05-28
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US5857022A (en) 1999-01-05
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AP9600811A0 (en) 1996-07-31
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EP0739560A1 (en) 1996-10-30
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CZ197896A3 (en) 1997-03-12
EP0739560B1 (en) 2001-06-20

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