Method and apparatus for symmetric-key encryption

Details Method and apparatus for symmetric-key encryption Method and apparatus for symmetric-key encryption

2006-09-19

2006-09-19

Louis-Jacques, Jacques H. (Department: 2134)

Cryptography

Communication system using cryptography

Symmetric key cryptography

Reexamination Certificate

active

07110545

ABSTRACT:
A symmetric-key cryptographic technique capable of realizing both high-speed cryptographic processing having a high degree of parallelism, and alteration detection. The invention includes dividing plaintext composed of redundancy data and a message to generate plaintext blocks each having a predetermined length, generating a random number sequence based on a secret key, generating a random number block corresponding to one of the plaintext blocks from the random number sequence, outputting a feedback value obtained as a result of operation on the one plaintext blocks and the random number block, the feedback value being fed back for using in the operation on another plaintext blocks, and performing an encryption operation using the one plaintext blocks, random number block, and feedback value.

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