Device for generating a message authentication code for authenticating a message

摘要

Device for generating a message authentication code for authenticating a message, wherein the message is divided in blocks (M) with a specified block length, the device comprising a generating unit for generating the message authentication code based on a message by using a block cipher algorithm, and an encrypting unit for performing an exclusive disjunction on the last block with a first key (K1, K2) and for performing an exclusive disjunction on the first and/or the last block additionally with a second key (K3, K4) for generating the message authentication code.

主权项

1. A device configured to generate a message authentication code for authenticating a message, wherein the message is divided into a plurality of blocks with a specified block length, the device comprising:
a first round configured to perform an exclusive disjunction on a first block of the plurality of blocks with a first key and send a first result into a cipher block to produce a first round output; a last round configured to perform an exclusive disjunction on a last block of the plurality of blocks with a second key and an output from a prior round, and send a second result into the cipher block to produce a last round output; and a security device configured to perform an exclusive disjunction on the last round output with a third key to produce the message authentication code.