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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.


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 ...


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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