Re: difference between AES and AESnnn

[<rkelly@elbow.com>]

thanks !

aha, so when using just "AES", the password length itself determines the
number of key bits to encrypt

if i use "losetup -e AES -S xxxxxx<-N->xxxxxxx" (meaning N characters for
seed) and then password with M characters, will the AES crypt bit size be
determined by N, by M or somehow by their combination ? Or which ever is
greater / smaller will determine the crypt bit size ?

thanks again - rkelly

On Sun, 16 Mar 2003, Jari Ruusu wrote:

> rkelly@elbow.com wrote:
> > hi what's the difference between using AES and AESnnn (e.g. AES192)
> > algorithm ?
> 
> Since you appear to be using Mandrake that includes loop-AES, AES encryption
> type is unhashed and password length determines actual number of key bits
> used to encrypt. AES128, AES192 and AES256 encryption types hash password
> with SHA-256, SHA-384 or SHA-512 and use specified number key bits to
> encrypt regardless of password length. Same AES cipher is used in all cases,
> only key is set up differently.
> 
> For new setups, use AES128, AES192 or AES256, and specify password seed with
> 'mount -o pseed=xxxxxxxxxx' or 'losetup -S xxxxxxxxxx'.
> 
> Regards,
> Jari Ruusu <jari.ruusu@pp.inet.fi>
> 
> 

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Linux-crypto:  cryptography in and on the Linux system
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