Graphical decrypt
--- Introduction ---
Warning. This exercise is probably
very hard even prohibitive
for those who don't know primitive polynomials over finite fields.
In this case please prefer
Decrypt which is mathematically much more rudimentary.
Graphical decrypt is an exercise on the algebraic cryptology based on
pseudo-random sequences generated by primitive polynomials over a finite field .
You will be presented a picture composed of pixels, crypted
by such a sequence. This picture has colors, each color representing an element .
And your goal is to decrypt this crypted picture, by finding back the
primitive polynomial as well as the starting terms which determine the pseudo-random sequence.
One should remark however that this is just an exercise for teaching
purposes. Even with the highest difficulty level, it is still
incomparably easier than the real algebraic crypting in the real life...
- Description: decrypt a picture crypted by a psudo-random sequence. This is the main site of WIMS (WWW Interactive Multipurpose Server): interactive exercises, online calculators and plotters, mathematical recreation and games
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