Public key diversification method

Details Public key diversification method Public key diversification method

1989-06-12

1990-07-24

Buczinski, Stephen C.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 30, 380 46, H04L 908, H04L 930

Patent

active

049440071

ABSTRACT:
A method is disclosed whereby individual members of a group of members or entities may be provided, under the control of a trusted member, referred to as the parent, with respective individual secret keys for use in public key cryptography, such that the matching public key can be readily derived, and group membership authenticated. The parent initially establishes a public key (e,N) where N=P.Q is the product of two primes. In response to a request from a group member, the parent selects two further primes R,S and communicates two values dependent thereon to the requesting member, which selects two more primes T and U for use in conjunction with the received values to establish the member's secret key.

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patent: 4349695 (1982-09-01), Morgan et al.
patent: 4405829 (1983-09-01), Rivest et al.
patent: 4424414 (1984-01-01), Hellman et al.
patent: 4471164 (1984-09-01), Henry
patent: 4720859 (1988-01-01), Aaro et al.
patent: 4797920 (1989-01-01), Stein
Rivest et al, "A Method for Obtaining Digital Signatures and Public-Key Cryptosystems"; "Communications of the ACM "(2/78; vol. 21, No. 2; pp. 120-126).
N.E.C. Research & Development, No. 71, Oct. 1983 (Tokyo, JP), K. Itakura et al., "A Public-Key Cryptosystem Suitable for Digital Multisignatures", pp. 1-8, see p. 4, left-hand column, line 7-last line; right-hand column, lines 10-12, line 28-last line; p. 5, left-hand column, line 31-last line; and
Review of the Electrical Communication Laboratories, vol. 32, No. 5, Sep. 1984 (Tokyo, JP), K. Koyama: "Encrypted Broadcast Communication Using Public Master Key", pp. 869-876, see p. 872, right-hand column, line 7-p. 873, left-hand column, line 6.

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