Cryptography – Particular algorithmic function encoding
Reexamination Certificate
2011-08-30
2011-08-30
Zand, Kambiz (Department: 2434)
Cryptography
Particular algorithmic function encoding
C380S037000, C380S029000, C380S277000, C380S265000, C713S168000, C713S189000, C713S170000
Reexamination Certificate
active
08009827
ABSTRACT:
An increase in safety from attacks by use of hardware-like methods by small-sized hardware is achieved. An encryption processing device includes a logical circuit capable of programmably setting logics for executing cipher processing, a memory that stores plural pieces of logical configuration information corresponding to an identical cipher processing algorithm, and a CPU that selectively sets plural logics corresponding to an identical cipher processing algorithm in the logical circuit. Even in processing using an identical cipher key, by changing the logic of the logical circuit for each processing, power consumption in cipher processing can be varied, and places a timing in which malfunctions occur can be varied. Moreover, an increase in the scale of hardware for realizing plural logics can be curbed.
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Endo Takashi
Kameyama Tatsuya
Okochi Toshio
Ota Shunsuke
Watanabe Takashi
A. Marquez, Esq. Juan Carlos
Bayou Yonas
Hitachi , Ltd.
Stites & Harbison PLLC
Zand Kambiz
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