Re: PROBLEM: AES cryptoloop corruption under recent -mm kernels

[James Morris]

On Fri, 16 Jan 2004, Mark Borgerding wrote:

>  From looking through the cryptoloop code, it looks like the IV for CBC
> mode is always the sector index.  It seems this could be weak against
> chosen plaintext attacks, as well as allowing an attacker to know which
> cipher blocks started any changes between two snapshots of the
> ciphertext.  I discuss ECB, since I wouldn't consider using it.

Eli Biham has suggested encrypting the sector numbers, see
http://people.redhat.com/jmorris/crypto/cryptoloop_eli_biham.txt



- James
-- 
James Morris
<jmorris@xxxxxxxxxx>


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