> Probably because I am dumb, but I can't quite
> understand the explanation you
> gave.
>
> But, trying to read between the lines, it sounds a
> bit like the "pig pen"
> code, which is mono-alphabetic and so is easy to
> decode.

>
> Regards

> Andrew Bruno
> abruno@...
>

Hi Andrew,
Well my explanation was a bit rushed, and not all that
clear,
first you will need to know how Matrices Multiply, and
http://tinyurl.com/6w7yo provides a far better
explanation than I could.
You then convert the plain-text into numbers by letter
A=1, B=2, ... Z=26.
So "H E L L O" = "8 5 12 12 15", in this case I'm
currently looking at we are working with 3*3 matrices
which means nine entries, so taking blocks of 9 letter
and arranging the corresponding numbers into a 3 by 3
block.
Then this matrix is multiplied by a pre-arranged (but
secret) invertible matrix (ie. det does not equal
zero), and the resulting matrix is transmitted.

Any clearer?
Simon





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