Security

Introducing Robustness into Message Authentication

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Executive Summary

Message Authentication Codes are very sensitive to any change of the message they are appended to. If one or more bits of the message change, Message Authentication Codes change about 50\% of their bits, making the message useless. The successful verification of Message Authentication Codes demands equality of all of bits of the received Message Authentication Code and that one recalculated of the received message. Such a hard condition for the successful verification of messages protected by Message Authentication Codes is not suitable for some applications.

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