Thanks to everyone whos sent me their thoughts on
this, it looks like Matt has found a version of it and
will be passing the info to my friend.
Ill try to respond to each of the messages when I get
time, quite busy this week though,
Thanks again,
Simon

--- matt_crypto <matt_crypto@...> wrote:

>
> --- Simon Kilby <skukok@y...> wrote:
> > Hi all,
> > Ive been set the challenge by one of my fellow
> Maths
> > Ungraduates of cracking a code that I claimed was
> easy
> > to break.
> > Basically the Plaintext is put into a 3*3 matrix
> (P),
> > and the Codematrix (C), remains constant and is
> > invertable.
> > I have three Coded matrices with the same C.
> > Any ideas?
> > Thanks,
> > Simon
>
> From your description, this appears to be the Hill
> cipher.
>
> http://en.wikipedia.org/wiki/Hill_cipher
>
> You could conceivably brute force the matrix,
> presuming it takes
> entries modulo 26. The key space is equivalent to
> about 40-41 bits.
>
> As others have mentioned, a crib would make things
> much easier.
>
> Matt
>
>
>
>




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