Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2006-02-14
2006-02-14
Barron, Jr., Gilberto (Department: 2132)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C713S156000, C380S028000, C380S030000, C380S286000
Reexamination Certificate
active
07000110
ABSTRACT:
Without the need to store and manage a private unique value of a hash function for each token, and without the fear of organizational private information of a center being revealed, a hash function is provided to a token. A unique value input unit is supplied with a unique value d, which is a parameter required to generate a hash function X. A message input unit is supplied with a message M from which to find a hash value. A function generation unique value memory unit 3 holds a function generation unique value s, which is a parameter required to generate a value generation unique value. A value generation unique value calculation unit generates a value generation unique value u from the function generation unique value s and the unique value d. A hash value calculation unit generates a hash value X(M) by applying a hash function H to the value generation unique value u and the message M. A hash value output unit outputs the hash value X(M) generated by the hash value calculation unit.
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Barron Jr. Gilberto
Fuji 'Xerox Co., Ltd.
Kim Jung W.
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