Re: crypt function mode

[Sudarshan Soma <sudarshan12s gmail com>]

Thanks a lot Martin. This is sufficient information for me to start
investigaiting further.

Best Regards,
Pavan.

On Tue, Apr 21, 2009 at 12:12 AM, Martin <inkubus interalpha co uk> wrote:
> On Mon, 2009-04-20 at 12:00 -0400, pam-list-request redhat com wrote:
> <snip>
>> Hi Martin, when you say the following:
>> "These are for symmetric encryption, the crypt function uses  them as
>> a one way hash (that why the later versions use MD5)."
>>
>> Does the crypt function use any of the block cipher mode with little
>> modifications. Please clarify.
> CBC, EBC, etc. are for encrypting multiple blocks while avoiding block
> level frequency analysis, insertion attacks, etc.  crypt does not use
> DES for encryption, it uses it as a form of hash, thus chain modes are
> simply not applicable.
>
> If you want to understand how it works, I *strong* suggest you read the
> code, this will give a far clearer explanation than I will manage.  Note
> that the MD5 based system, although it solves the same problem, does so
> in a very different manner.
>
> Cheers,
>  - Martin
>
>
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