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- W55486550 abstract "In this paper, we study the security proofs of GCM (Galois/Counter Mode of Operation). We first point out that a lemma, which is related to the upper bound on the probability of a counter collision, is invalid. Both the original privacy and authenticity proofs by the designers are based on the lemma. We further show that the observation can be translated into a distinguishing attack that invalidates the main part of the privacy proof. It turns out that the original security proofs of GCM contain a flaw, and hence the claimed security bounds are not justified. A very natural question is then whether the proofs can be repaired. We give an affirmative answer to the question by presenting new security bounds, both for privacy and authenticity. As a result, although the security bounds are larger than what were previously claimed, GCM maintains its provable security. We also show that, when the nonce length is restricted to 96 bits, GCM has better security bounds than a general case of variable length nonces." @default.
- W55486550 created "2016-06-24" @default.
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- W55486550 date "2012-01-01" @default.
- W55486550 modified "2023-09-27" @default.
- W55486550 title "Breaking and Repairing GCM Security Proofs" @default.
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- W55486550 doi "https://doi.org/10.1007/978-3-642-32009-5_3" @default.
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