Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2007-11-27
2007-11-27
Vu, Kim (Department: 2135)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C713S167000, C713S168000, C713S171000, C713S189000, C713S193000, C713S194000, C380S001000, C380S044000, C380S046000, C380S277000
Reexamination Certificate
active
10343888
ABSTRACT:
Authentification data (R) comprising random numbers generated by a reader/writer (200) is given to an IC card (100), encrypted by utilizing a secret key (a), and returned as encryption data (C). This encryption data (C) is decoded by utilizing an open key (β) to authentify the IC card. A set of past given authentification data (R) is stored in an authentification data storage section (130): if another set of given authentification data (R) is the same as the set of past data, an encryption operating section (150) is prevented from executing an illegal statistical analysis technique by repeatedly giving encrypting operation the same set of authentiification data (R).
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Irisawa Kazuyoshi
Shibata Naoto
Shinriki Tetsuo
Dada Beemnet W
Dai Nippon Printing Co. Ltd
Ladas & Parry
Vu Kim
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