--- 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...
The most recent version
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- Description: decrypt a picture crypted by a psudo-random sequence. serveur web interactif avec des cours en ligne, des exercices interactifs en sciences et langues pour l'enseigment primaire, secondaire et universitaire, des calculatrices et traceurs en ligne
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