Algebraic Attacks on the Courtois Toy Cipher

@article{Albrecht2008AlgebraicAO,
  title={Algebraic Attacks on the Courtois Toy Cipher},
  author={Martin R. Albrecht},
  journal={Cryptologia},
  year={2008},
  volume={32},
  pages={220-276}
}
Block ciphers are fundamental building block of modern cryptography. Recently, a new technique to attack block ciphers has emerged called “algebraic attacks”. These attacks work by expressing block ciphers as quadratic equation systems and solving those systems of equations. In May 2006 Nicolas Courtois – author of many influential research papers on algebraic attacks – presented a toy cipher called CTC and claimed to have broken this cipher in a configuration where the block size is 255-bit… CONTINUE READING

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