Welcome to the resource topic for 2022/476
Title:
{\sf TrCBC} is Insecure
Authors: Debrup Chakraborty, Samir Kundu
Abstract:{\sf TrCBC} is a variant of CBC-MAC which appeared in {\em Information Processing Letters}, 112(7):302-307, 2012. The authors claimed {\sf TrCBC} to be a secure message authentication code (MAC) with some interesting properties. If {\sf TrCBC} is instantiated with a block cipher with block length n, then it requires \lceil \lambda /n \rceil block cipher calls for authenticating a \lambda-bit message and requires a single key, which is the block cipher key. We show that with high probability, an adversary can forge {\sf TrCBC} with just three queries. The attack that we show can be applied to forge a large class of messages.
ePrint: https://eprint.iacr.org/2022/476
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