A Complexity-Theoretic Approach to the Design of Good Measures of Cryptographic Strength

  • Authors:
  • Juan David González Cobas;José Antonio López Brugos

  • Affiliations:
  • -;-

  • Venue:
  • Computer Aided Systems Theory - EUROCAST 2001-Revised Papers
  • Year:
  • 2001

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Abstract

Quality assessment for cryptographic algorithms is usually devised by a combination of statistical or information-theoretic techniques for testing a pseudo-random sequence generator (PRSG for short). Many tests among these share a common framework. The difference among tests usually relies on the choice of the computational device and its suitable definition of "size" that determines the workload needed to match the allegedly random output of a PRSG. The most outstanding examples among these are compared, showing that there appears to be a hierarchy of tests whose complexity increases with their discriminating power. The possibility of a tradeoff between computational complexity of the measure and its value in cryptographic strength assessment is explored, and the criteria towards an optimal measure of strength are proposed.