--- Introduction ---

Graphical decrypt is an exercise on the algebraic cryptology based on
pseudo-random sequences generated by primitive polynomials over a finite field
_{q}.
You will be presented a picture composed of *n*×*n* pixels, crypted
by such a sequence. This picture has q colors, each color representing an
element of _{q}.

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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Please take note that WIMS pages are interactively generated; they are not ordinary HTML files. They must be used interactively ONLINE. It is useless for you to gather them through a robot program.

Description: decrypt a picture crypted by a psudo-random sequence. interactive exercises, online calculators and plotters, mathematical recreation and games

Keywords: interactive mathematics, interactive math, server side interactivity, algebra,coding, finite field, cryptology, primitive polynomial, cyclic code