Cryptography – Particular algorithmic function encoding – Public key
Patent
1996-05-17
1999-08-03
Noori, Max H.
Cryptography
Particular algorithmic function encoding
Public key
380 28, 380 21, 380 4, H04K 100, H04L 900
Patent
active
059335041
ABSTRACT:
A cryptosystem utilizes the properties of discrete logs in finite groups, either in a public key message exchange or in a key exchange and generation protocol. If the group selected has subgroups of relatively small order, the message may be exponentiated by a factor of the order of the group to place the message in a subgroup of relatively small order. To inhibit such substitution, the base or generator of the cryptosystem is chosen to be a generator of a subgroup of prime order or a subgroup of an order having a number of relatively small divisors. The message may be exponentiated to each of the relatively small divisors and the result checked for the group identity. If the group identity is found, it indicates a vulnerability to substitution and is rejected.
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Menezes Alfred John
Qu Minghua
Vanstone Scott A.
Certicom Corp.
Clark Robin C.
Noori Max H.
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