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Title:
Secret Key Leakage from Public Key Perturbation of DLP-based Cryptosystems
Authors: Alexandre Berzati, Cécile Canovas-Dumas, Louis Goubin
Abstract:Finding efficient countermeasures for cryptosystems against fault attacks is challenged by a constant discovery of flaws in designs. Even elements, such as public keys, that do not seem critical must be protected. From the attacks against RSA, we develop a new attack of DLP-based cryptosystems, built in addition on a lattice analysis to recover DSA public keys from partially known nonces. Based on a realistic fault model, our attack only requires 16 faulty signatures to recover a 160-bit DSA secret key within a few minutes on a standard PC. These results significantly improves the previous public element fault attack in the context of DLP-based cryptosystems.
ePrint: https://eprint.iacr.org/2010/582
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