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- W2891609868 abstract "Multi-user (mu) security considers large-scale attackers (e.g., state actors) that given access to a number of sessions, attempt to compromise at least one of them. Mu security of authenticated encryption (AE) was explicitly considered in the development of TLS 1.3. This paper revisits the mu security of GCM, which remains to date the most widely used dedicated AE mode. We provide new concrete security bounds which improve upon previous work by adopting a refined parameterization of adversarial resources that highlights the impact on security of (1) nonce re-use across users and of (2) re-keying. As one of the main applications, we give tight security bounds for the nonce-randomization mechanism adopted in the record protocol of TLS 1.3 as a mitigation of large-scale multi-user attacks. We provide tight security bounds that yield the first validation of this method. In particular, we solve the main open question of Bellare and Tackmann (CRYPTO '16), who only considered restricted attackers which do not attempt to violate integrity, and only gave non-tight bounds." @default.
- W2891609868 created "2018-09-27" @default.
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- W2891609868 date "2018-10-15" @default.
- W2891609868 modified "2023-09-27" @default.
- W2891609868 title "The Multi-user Security of GCM, Revisited" @default.
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- W2891609868 doi "https://doi.org/10.1145/3243734.3243816" @default.
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