Cryptographic operation apparatus for AES

摘要

In a cryptographic operation apparatus, the result of an encryption process, or decryption process, is obtained by disposing two operational circuits (201, 202, 302, 303, 402, 403) in parallel, each comprising four multiplying devices (211 through 214) and an exclusive-OR device (215), and by processing an input data string in two cycles; or by processing an input data string by a single operational circuit (602, 702) in four cycles.