Re: Encoding Schemes

[Marcus Williams <marcus () quintic co uk>]

On 09/11/2005 Jason binger wrote:
> I am reviewing a web app and I would like to know what
> encoding scheme they are using to encode their
> parameters.
>
> 123456 encodes to B8DCCEA11586
> ABCDEF encodes to C8ACBED165F6

At a guess its a simple XOR scheme as most people think this is secure 
if you dont know the "secret" key that its been XOR'd with. The problem 
with this is, if you know plaintext + cyphertext then if you XOR these 
together, you know the "secret" password (almost, because they may 
repeat it or it may be longer than the text etc but you're halfway there 
- all you need is some longer examples to find this out)

So my guess is that UVWXYZ encodes to DCB8AACD79EA

Am I right or am I right?

Marcus


--
Marcus Williams -- http://www.cad-schroer.co.uk
CAD Schroer UK, 39 Newnham Road, Cambridge, UK