Re: Cracking simple password encryption

On Wed, 21 Dec 2005, David Hogue wrote:
> I am trying to figure out the password encryption scheme used by some
> software and haven't had much luck yet.
>
> password        crypted
> a               aQ==
> b               cg==
> c               ew==
> aa              aWo=
> ab              aXE=
> cc              e3g=
> aaa             aWpq
> aab             aWpx
> abb             aXFx
> bbb             cnFx

First of all you can RE your software. Alternatively, since this
`encryption' preserves prefix you can easily find password for any
given `crypted' by sequentially finding each next character starting
from the first.

Hint: base64 decoding
 a               i
 b               r
 c               {
 aa              ij
 ab              iq
 cc              {x
 aaa             ijj
 aab             ijq
 abb             iqq
 bbb             rqq

-- 
Regards,
ASK

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