Block encoding method and block encoding/decoding circuit

Details Block encoding method and block encoding/decoding circuit Block encoding method and block encoding/decoding circuit

2008-06-10

2008-06-10

Revak, Christopher (Department: 2131)

Cryptography

Communication system using cryptography

Time segment interchange

C380S042000, C380S043000, C380S277000, C713S189000

Reexamination Certificate

active

07386124

ABSTRACT:
A block cipher method eliminates the overhead associated with key scheduling, decreases the required time for encryption or decryption, and increases the total throughput. A key scheduling circuit (12) for generating round key data from key data for the encryption or the decryption and a bank memory (13) for storing the round key data generated by the key scheduling circuit (12) at a predetermined bank of the bank memory are provided. An encrypting/decrypting circuit (11) is provided for encrypting plaintext data or decrypting ciphertext data upon receipt of the round key data stored in the bank and a block of the plaintext data or the ciphertext data one by one. The output of the encryption or the decryption is retrieved from the encrypting/decrypting circuit (11).

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Alfred J Menezes et al. “Handbook of Applied Cryptography”, Oct. 1996, CRC Press, pp. 223-237.

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