Method and apparatus for symmetric-key decryption

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

2008-04-15

2008-04-15

Tran, Ellen (Department: 2134)

Cryptography

Communication system using cryptography

Symmetric key cryptography

C380S262000, C380S259000

Reexamination Certificate

active

07359515

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 block and the random number block, the feedback value being fed back for using the operation on another plaintext block, and performing an encryption operation using the one plaintext block, random number block, and feedback value.

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