[Cryptography] Question re: Initialization Vector for AES Counter Mode…

[Ron Garret]

On Apr 29, 2017, at 2:25 AM, Ray Dillinger <bear at sonic.net> wrote:

> A reasonable protection from bitflipping, if you want something that
> works like a counter mode, doubles the work of encryption/decryption.
> That is to separately encrypt the plaintext and the counter, and let the
> ciphertext be the XOR of the result.  To decrypt, one encrypts the
> counter, XORs the result with the ciphertext, then decrypts the result
> to get the plaintext.

Why not just add the counter to the key and then encrypt?

rg

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