EFFICIENT ENCRYPTION AND AUTHENTICATION FOR DATA PROCESSING SYSTEMS

摘要

Methods and apparatus are presented herein for encrypting and authentication data, such that some of data can be transmitted in the clear but still be authenticated by the sender. A set of cleartext positions and/or a set of ciphertext positions are used to specify which data blocks will be used to generate an input checksum value (470) and an output checksum value (475). These checksums are then used to generate an authentication tag. (490)