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CMAC is a block cipher-based message authentication code algorithm.

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CMAC Generation : If input payload length is not aligned in 16 bytes, what are the possible ...

I hope you mean drawback caused by AES CBC-MAC which is resolved in AES-CMAC. AES_CBC MAC if used properly with ISO padding technique should not result into a tag collision. … Please see the image for padded case in AES-CMAC If the last block is aligned (16 bytes in case AES as PRF) then XOR the output of the block with the $K_2$. …
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