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How much data can I encrypt with AES before I need to change the key in CBC mode?
In my cryptography class, the instructor suggested that in order to give the attacker a minimal advantage of $1/2^{32}$, we have to change the key after $2^{48}$ blocks are encrypted.
It seems that ...
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Is the AES encryption scheme CPA secure?
Give a 256 bit key space and 128 message space would AES block cipher as the encryption scheme be CPA secure?
