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Automatic Generation of Declarative Models For Differential Cryptanalysis

Authors Luc Libralesso, François Delobel, Pascal Lafourcade, Christine Solnon



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Author Details

Luc Libralesso
  • LIMOS, CNRS UMR 6158, University Clermont Auvergne, Aubière, France
François Delobel
  • LIMOS, CNRS UMR 6158, University Clermont Auvergne, Aubière, France
Pascal Lafourcade
  • LIMOS, CNRS UMR 6158, University Clermont Auvergne, Aubière, France
Christine Solnon
  • INSA Lyon, CITI, INRIA CHROMA, F-69621 Villeurbanne, France

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Luc Libralesso, François Delobel, Pascal Lafourcade, and Christine Solnon. Automatic Generation of Declarative Models For Differential Cryptanalysis. In 27th International Conference on Principles and Practice of Constraint Programming (CP 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 210, pp. 40:1-40:18, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2021)
https://doi.org/10.4230/LIPIcs.CP.2021.40

Abstract

When designing a new symmetric block cipher, it is necessary to evaluate its robustness against differential attacks. This is done by computing Truncated Differential Characteristics (TDCs) that provide bounds on the complexity of these attacks. TDCs are often computed by using declarative approaches such as CP (Constraint Programming), SAT, or ILP (Integer Linear Programming). However, designing accurate and efficient models for these solvers is a difficult, error-prone and time-consuming task, and it requires advanced skills on both symmetric cryptography and solvers. In this paper, we describe a tool for automatically generating these models, called Tagada (Tool for Automatic Generation of Abstraction-based Differential Attacks). The input of Tagada is an operational description of the cipher by means of black-box operators and bipartite Directed Acyclic Graphs (DAGs). Given this description, we show how to automatically generate constraints that model operator semantics, and how to generate MiniZinc models. We experimentally evaluate our approach on two different kinds of differential attacks (e.g., single-key and related-key) and four different symmetric block ciphers (e.g., the AES (Advanced Encryption Standard), Craft, Midori, and Skinny). We show that our automatically generated models are competitive with state-of-the-art approaches. These automatically generated models constitute a new benchmark composed of eight optimization problems and eight enumeration problems, with instances of increasing size in each problem. We experimentally compare CP, SAT, and ILP solvers on this new benchmark.

Subject Classification

ACM Subject Classification
  • Security and privacy → Cryptanalysis and other attacks
Keywords
  • Constraint Programming
  • SAT
  • ILP
  • Differential Cryptanalysis

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