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• W1483290420 abstract "The strongest standard security notion for digital signature schemes is unforgeability under chosen message attacks. In practice, however, this notion can be insufficient due to “side-channel attacks” which exploit leakage of information about the secret internal state. In this work we put forward the notion of “leakage-resilient signatures,” which strengthens the standard security notion by giving the adversary the additional power to learn a bounded amount of arbitrary information about the secret state that was accessed during every signature generation. This notion naturally implies security against all side-channel attacks as long as the amount of information leaked on each invocation is bounded and “only computation leaks information.” The main result of this paper is a construction which gives a (tree-based, stateful) leakage-resilient signature scheme based on any 3-time signature scheme. The amount of information that our scheme can safely leak per signature generation is 1/3 of the information the underlying 3-time signature scheme can leak in total. Signature schemes that remain secure even if a bounded total amount of information is leaked were recently constructed, hence instantiating our construction with these schemes gives the first constructions of provably secure leakage-resilient signature schemes. The above construction assumes that the signing algorithm can sample truly random bits, and thus an implementation would need some special hardware (randomness gates). Simply generating this randomness using a leakage-resilient stream-cipher will in general not work. Our second contribution is a sound general principle to replace uniform random bits in any leakage-resilient construction with pseudorandom ones: run two leakage-resilient stream-ciphers (with independent keys) in parallel and then apply a two-source extractor to their outputs." @default.
• W1483290420 created "2016-06-24" @default.
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• W1483290420 date "2010-01-01" @default.
• W1483290420 modified "2023-09-23" @default.
• W1483290420 title "Leakage-Resilient Signatures" @default.
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• W1483290420 doi "https://doi.org/10.1007/978-3-642-11799-2_21" @default.
• W1483290420 hasPublicationYear "2010" @default.
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