Technical Report CS0887

Title: Cryptanalysis of the Portz Interconnection-Network Block-Cipher
Authors: A. Biryukov and S. Even
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Abstract: A probabilistic polynomial complexity cryptanalysis of the Portz cipher is presented. The analysis applies to a class of similar systems as well, and relies on the symmetry of the interconnection network and on the linearity of the control function for setting the switches.
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