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No integrity on the ciphertext again, since the MAC is taken against the plaintext.

Here, the MAC cannot provide any information on the plaintext either, since it is encrypted.

This is a theoretical point, of course, since practically speaking the MAC secret should provide protection.

If the cipher scheme is malleable it may be possible to alter the message to appear valid and have a valid MAC.

Does not provide any integrity on the ciphertext, since we have no way of knowing until we decrypt the message whether it was indeed authentic or spoofed.

In other words, we haven't carried any structure from the plaintext into the MAC.

The MAC does not provide any information on the plaintext since, assuming the output of the cipher appears random, so does the MAC.

If the cipher scheme is malleable we need not be so concerned since the MAC will filter out this invalid ciphertext.

EtM ensures you only read valid messages. Assuming the MAC shared secret has not been compromised, we ought to be able to deduce whether a given ciphertext is indeed authentic or has been forged for example, in public-key cryptography anyone can send you messages. I shall paraphrase it in English, rather than Mathematical notation, as I understand it. Anyway, this paper neatly summarizes all these approaches, and what level of security they do or don't provide. I'm assuming you actually know all of this better than I do. What are the arguments for or against either? The first two options are often called 'MAC-then-encrypt' while the third is 'encrypt-then-MAC'.

Encrypt-then-MAC: Encrypt the cleartext, then compute the MAC on the ciphertext, and append it to the ciphertext? (In that case, we do not forget to include the initialization vector (IV) and the encryption method identifier into the MACed data.).

Encrypt-and-MAC: Compute the MAC on the cleartext, encrypt the cleartext, and then append the MAC at the end of the ciphertext? (That's what SSH does).

MAC-then-Encrypt: Compute the MAC on the cleartext, append it to the data, and then encrypt the whole? (That's what TLS does).How should we assemble the encryption and the MAC? AES with CBC chaining and PKCS#5 padding) and a standalone MAC (e.g. There are some nifty encryption modes which include a MAC ( EAX, GCM.) but let's assume that we are doing old-style crypto, so we have a standalone encryption method (e.g. You must use them to always keep your Mac running properly, and thus prolong its’ life.Most of the time, when some data must be encrypted, it must also be protected with a MAC, because encryption protects only against passive attackers.

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