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).

 
Web www.patentalert.com

< Method of implementing in an electronic component a cryptographic algorithm for finding the public exponent

> Techniques of imperceptibly altering the spectrum of a displayed image in a manner that discourages copying

~ 00438