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 Sep 24 awarded Autobiographer Nov 7 awarded Scholar Nov 7 accepted Forge CBC-MAC given the MAC of two messages and of their concatenation Nov 5 asked Forge CBC-MAC given the MAC of two messages and of their concatenation Nov 5 comment Generalizing a CBC-MAC collision with a common final message block Why did it have to emphasize that c is block length 1? Nov 5 awarded Custodian Nov 5 awarded Editor Nov 5 revised Generalizing a CBC-MAC collision with a common final message block added 2 characters in body Nov 5 reviewed Approve Generalizing a CBC-MAC collision with a common final message block Nov 5 comment Generalizing a CBC-MAC collision with a common final message block Okay. But I still don't know what the question is asking. What does "most general class of messages" mean? Do I need to talk about what c is? Nov 5 comment Generalizing a CBC-MAC collision with a common final message block So if $\\ \\ CBC-MAC(x) = t \\ CBC-MAC(y) = t' \\ Then CBC-MAC(x || y \oplus t) = t' \\$ If y is block length 1 correct? Nov 4 awarded Student Nov 4 asked Generalizing a CBC-MAC collision with a common final message block