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PQCRYPTO
2010

Properties of the Discrete Differential with Cryptographic Applications

10 years 4 months ago
Properties of the Discrete Differential with Cryptographic Applications
Abstract. Recently, the Csignature scheme has been completely broken by Dubois et al. [2, 3]. As a consequence, the security of SFLASH and other multivariate public key systems have been impaired. The attacks presented in [2, 3] rely on a symmetry of the differential of the encryption mapping. In [1], Ding et al. experimentally justify the use projection as a method of avoiding the new attack. In this paper, we derive some properties of the discrete differential, give a theoretical justification for the reparation in [1], and establish the exact context in which this attack is applicable. Key words: Matsumoto-Imai, multivariate public key cryptography, discrete, differential, SFLASH, symmetry, HFE
Daniel Smith-Tone
Added 18 Oct 2010
Updated 18 Oct 2010
Type Conference
Year 2010
Where PQCRYPTO
Authors Daniel Smith-Tone
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