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If someone gain physical access to my computer will they be able to use those said attacks to decrypt my files? No, there needs to be an active implementation of AES for these attacks to work; unless the attacker can startup a service that acts on the plaintext or ciphertext data, padding and side channel attacks are not possible. Let's say they where able ...


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There is a good reason to use zero-IV in CBC-MAC; if there is fixed no-Zero IV then an attacker can modify the $IV$ and $P_1$ so that the first block of the plaintext can become the advantage of the attacker. The first step of the CBC-MAC tag calculation is performed as $$C_1 = E_k(IV \oplus P_1)$$ Now let $P_1'$ be the target first block that the attacker ...


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