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Communication Dans Un Congrès Année : 2015

Key-Recovery Attacks on ASASA

Résumé

The ASASA construction is a new design scheme introduced at Asiacrypt 2014 by Biryukov, Bouillaguet and Khovratovich. Its versatility was illustrated by building two public-key encryption schemes, a secret-key scheme, as well as super S-box subcomponents of a white-box scheme. However one of the two public-key cryptosystems was recently broken at Crypto 2015 by Gilbert, Plût and Treger. As our main contribution, we propose a new algebraic key-recovery attack able to break at once the secret-key scheme as well as the remaining public-key scheme, in time complexity 2^63 and 2^39 respectively (the security parameter is 128 bits in both cases). Furthermore, we present a second attack of independent interest on the same public-key scheme, which heuristically reduces its security to solving an LPN instance with tractable parameters. This allows key recovery in time complexity 256. Finally, as a side result, we outline a very efficient heuristic attack on the white-box scheme, which breaks an instance claiming 64 bits of security under one minute on a single desktop computer.

Dates et versions

hal-01245381 , version 1 (17-12-2015)
hal-01245381 , version 2 (06-01-2017)

Identifiants

Citer

Brice Minaud, Patrick Derbez, Pierre-Alain Fouque, Pierre Karpman. Key-Recovery Attacks on ASASA. International Conference on the Theory and Application of Cryptology and Information Security 2015 - ASIACRYPT 2015, IACR, Nov 2015, Auckland, New Zealand. ⟨10.1007/978-3-662-48800-3_1⟩. ⟨hal-01245381v1⟩

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