A Complexity-Theoretic Approach to the Design of Good Measures of Cryptographic Strength. - Juan David González Cobas; José Antonio López Brugos (EUROCAST, 2001)

How Many Rounds to KO?, or Complexity Increase by Cryptographic Map Iteration. - Juan David González Cobas; José Antonio López Brugos (EUROCAST, 2003)

Complexity-Theoretical Approaches to the Design and Analysis of Cryptographical Boolean Functions. - Juan David González Cobas; José Antonio López Brugos (EUROCAST, 2005)