The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 14, 2006
Filed:
Jun. 06, 2000
Taro Terao, Nakai-machi, JP;
Taro Terao, Nakai-machi, JP;
Fuji Xerox Co., Ltd., Tokyo, JP;
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.