Method and apparatus for encrypting data

Details Method and apparatus for encrypting data Method and apparatus for encrypting data

2007-01-02

2007-01-02

Peeso, Thomas R. (Department: 2132)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C713S189000, C713S193000

Reexamination Certificate

active

10658340

ABSTRACT:
An encryption apparatus provided with a Feistel type encryption algorithm includes a function operation unit that operates a non-linear function, and changing unit configured to supply the function operation unit with random data unrelated to an encryption operation result. In this way, a countermeasure can be taken against a DPA attack following the end of an operation by the encryption operation apparatus provided with the Feistel type encryption algorithm.

REFERENCES:
patent: 2000-66585 (2000-03-01), None
patent: 2002-311826 (2002-10-01), None
patent: 2002-366029 (2002-12-01), None
Kawamura et al.; “Encryption/Decryption Apparatus, Encryption/Decryption Method, and Program Storage Medium Therefor”, U.S. Appl. No. 09/377,064, filed Aug. 19, 1999.

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