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Comment: uploaded more files including sample sr implementation

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Deletions are marked like this.  Additions are marked like this. 
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See attachment:MPolynomialSystem/mpolynomialsystem.py  see http://trac.sagemath.org/sage_trac/ticket/681 
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See attachment:MPolynomialSystem/mpolynomialsystemgenerator.py  see http://trac.sagemath.org/sage_trac/ticket/681 
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* AES (SR) see attachment:MPolynomialSystem/sr.py might still contain bugs * CTC 
* AES; see http://trac.sagemath.org/sage_trac/ticket/681 * CTC; not published yet 
MPolynomialSystem
Introduction
This page's purpose is to describe the design of a MPolynomialSystem class. This class is supposed to model multivariate polynomial systems as they e.g. appear in algebraic cryptanalysis. The proposed and almost implemented design is as follows. There is a class MPolynomialSystem which models the actual polynomial system. Also there is a base class called MPolynomialSystemGenerator which is meant as a base class for specific generators for polynomial systems like AES or the Courtois Toy Cipher.
MPolynomialSystem
see http://trac.sagemath.org/sage_trac/ticket/681
MPolynomialSystemGenerator
see http://trac.sagemath.org/sage_trac/ticket/681
Implemented Polynomial System generators
 CTC; not published yet