Re: CTR and disk sector encryption

>Your biggest problem is that the data that is stored on the disk will
>change (HDs are R/W), and when that happens you will have to encrypt the
>new data you write to disk. If you use the same counter for encrypting
>the new data as you used for encrypting the data that was previously
>stored on the same sector, you have reused the CTR counter in such way
>that confidentiality is compromised.

Hmm... yes... so, you really need a random counter actually. Right ?

-- Axelle.
Received on Mon May 1 01:55:56 2006