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It has the disadvantages of any MAC-then-encrypt scheme, which I'm quoting from the linked answer below. In addition: It has the property that you need both a nonce and a hash, so for equivalent security it requires more message space. The nonce has to be random, so it requires strong random numbers for each message, unlike e.g. AES CTR + HMAC. Doesn't ...


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I haven't seen much analysis on using ordinary hashes for content authentication. Can anyone can give me a pointer on whether this is safe? With good choice of primitives it is. Public key signatures use a hash function in a similar way to identify the message signed. However, where a MAC only needs what amounts to second preimage resistance, a hash ...



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