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Yes, you are correct. For padding - there's no way to fix it at step 5, you need to make correct padding at step 1.


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First the block cipher can take on more than one general form provided certain criteria are met and in terms of: block cipher, Fk, secure CBC-MAC,and of course CBC mode. Pseudo random generators and permutations as an aside an in response to above are very related in terms of inversion. In symbols F:K*X---> PRP. If a given block cipher is secure this does ...


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Rejecting replays is the duty of a higher level protocol. Simple authenticated encryption will accept any message with a valid MAC, even if you receive it several times. Decryption is a stateless process, but you need state to keep track of messages you already received. For example you could associate an increasing counter for each message you send. The ...



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