Method and apparatus for symmetric-key encryption

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

H - Electricity

04

L

H04L 9/20 (2006.01) H04L 9/06 (2006.01) H04L 9/32 (2006.01)

Patent

CA 2337306

The present invention provides a symmetric-key cryptographic technique capable of realizing both high-speed cryptographic processing having a high degree of parallelism and alteration detection. The present invention performs the steps of: dividing plain text composed of redundancy data and a message to generate a plurality of plain text 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 plurality of plain text blocks from the random number sequence; outputting a feedback value obtained as a result of operation on the one of the plurality of plain text blocks and the random number block, the feedback value being fed back to another one of the plurality of plain text blocks; and performing an encryption operation using the one of the plurality of plain text blocks, the random number block, and a feedback value obtained as a result of operation on still another one of the plurality of plain text blocks to produce a ciphertext block.

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