CRYPTOGRAPHIC METHOD USING A DATA FLOW-SYMMETRICAL CRYPTOGRAPHIC ALGORITHM AND USE IN A SMART CARD

摘要

The invention concerns a cryptographic method using a data block-symmetrical cryptographic algorithm such as DES in a particular sequence enabling its cryptographic strength to be increased significantly. Said method enables generating a pseudo-random number, and/or a strong random variable or data flow encryption/decryption and/or authentication of messages to be generated. It is more particularly adapted to encryption/decryption and to authentication by a smart card of data contained in a remote memory.