Re: AES counter mode

On Sun, Jun 2, 2013 at 12:24 PM, Peter Gutmann
<[email protected]> wrote:
> Implementing counter mode is pretty simple when you've got ECB mode, you just
> encrypt the counter in ECB mode and XOR with the data.  However, it's very,
> very easy to get counter mode wrong, which means a simple XOR is all anyone
> needs in order to recover the encrypted data.  AES-CTR is the logical
> successor to RC4 in terms of both functionality and ease-of-misuse, so you
> have to be extremely careful to get it right.  I wouldn't use it myself
> because it's too easy to get wrong.  You can do the same as you require with
> CBC, provided you stop and start at a 16-byte boundary.

Thank you for your quick answer. One clarification, with CBC I can
start/stop the process if I save the last ciphertext block along with
key and IV, correct? Also am I wrong to say that I cannot encrypt the
plaintext blocks in parallel since I need to have already encrypted
all previous blocks to encrypt the next one?

Thanks again,
Konstantinos

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