An encryption/decryption unit includes a first data encryption/decryption section for performing an encryption or decryption process, a first data substitution section for performing data substitution of an output from the first encryption/decryption section according to a predetermined permutation table,...http://www.google.com.tw/patents/US6985582?utm_source=gb-gplus-share專利 US6985582 - Encryption/decryption unit and storage medium
