On the Design of SP Networks From an Information Theoretic Point of View
نویسندگان
چکیده
Abstract : The cryptographic strength of an SP network depends crucially on the strength of its substitution boxes (S-boxes). In this paper we use the concept of information leakage to evaluate the strength of Sboxes and SP networks. We define a n equivalence class on n x n S-boxes that is invariant in information leakage. Simulation results for a 16x 16 SP network suggest that after a sufficient number of rounds the distribution of the output XOR in the SP network looks random. We further present simulation results to show that the information leakage for a n SP network diminishes more rapidly with the number of rounds when the S-boxes are cryptographically strong.
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