Encryption/decryption unit and storage medium

Details Encryption/decryption unit and storage medium Encryption/decryption unit and storage medium

2006-05-02

2006-05-02

Cangialosi, Salvatore (Department: 3621)

Cryptography

Communication system using cryptography

Data stream/substitution enciphering

C380S037000

Reexamination Certificate

active

07039184

ABSTRACT:
An encryption/decryption unit includes a first data encryption/decryption section for performing an encryption or decryption process, a first data substitution section for performing data substitution of an output from the first encryption/decryption section according to a predetermined permutation table, a second data encryption/decryption section for performing an encryption or decryption process for an output from the first data substitution section, a second data substitution section for performing data substitution of an output from the second data encryption/decryption section according to a predetermined permutation table, and a third data encryption/decryption section for performing an encryption or decryption process for an output from the second data substitution section.

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