WO1995005712A3 - Secret key exchange - Google Patents

Secret key exchange Download PDF

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Publication number
WO1995005712A3
WO1995005712A3 PCT/US1994/009103 US9409103W WO9505712A3 WO 1995005712 A3 WO1995005712 A3 WO 1995005712A3 US 9409103 W US9409103 W US 9409103W WO 9505712 A3 WO9505712 A3 WO 9505712A3
Authority
WO
WIPO (PCT)
Prior art keywords
key
individual
secret
keys
users
Prior art date
Application number
PCT/US1994/009103
Other languages
French (fr)
Other versions
WO1995005712B1 (en
WO1995005712A2 (en
Inventor
Frank Thomson Leighton
Silvio Micali
Original Assignee
Frank Thomson Leighton
Silvio Micali
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 Frank Thomson Leighton, Silvio Micali filed Critical Frank Thomson Leighton
Publication of WO1995005712A2 publication Critical patent/WO1995005712A2/en
Publication of WO1995005712A3 publication Critical patent/WO1995005712A3/en
Publication of WO1995005712B1 publication Critical patent/WO1995005712B1/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
    • H04L9/0838—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

Abstract

The present invention describes a method for enabling users of a cryptosystem to agree on secret keys. In one embodiment, a trusted agent chooses at least one individual key for each user, with at least a portion of such individual key being secret. At least some of the individual keys are then stored in physically secure devices, and the pair of users i and j use their individual keys to compute a common secret key. In another embodiment, each trustee of a group of trustees chooses at least one individual key for each user, with at least some portion of such individual key being secret. The keys chosen by a sufficiently small number of such trustees, however, are insufficient for computing the common secret key of the users. Other hardware and software key exchange protocols based on these two techniques are also disclosed.
PCT/US1994/009103 1993-08-13 1994-08-12 Secret key exchange WO1995005712A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10693293A 1993-08-13 1993-08-13
US08/106,932 1993-08-13

Publications (3)

Publication Number Publication Date
WO1995005712A2 WO1995005712A2 (en) 1995-02-23
WO1995005712A3 true WO1995005712A3 (en) 1995-04-27
WO1995005712B1 WO1995005712B1 (en) 1995-05-26

Family

ID=22314016

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1994/009103 WO1995005712A2 (en) 1993-08-13 1994-08-12 Secret key exchange

Country Status (3)

Country Link
US (1) US5519778A (en)
CA (1) CA2169449A1 (en)
WO (1) WO1995005712A2 (en)

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