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- W4320082912 abstract "We give the first examples of public-key encryption schemes which can be proven to achieve multi-challenge, multi-user CCA security via reductions that are tight in time, advantage, and memory. Our constructions are obtained by applying the KEM-DEM paradigm to variants of Hashed ElGamal and the Fujisaki-Okamoto transformation that are augmented by adding uniformly random strings to their ciphertexts. The reductions carefully combine recent proof techniques introduced by Bhattacharyya’20 and Ghoshal-Ghosal-Jaeger-Tessaro’22. Our proofs for the augmented ECIES version of Hashed-ElGamal make use of a new computational Diffie-Hellman assumption wherein the adversary is given access to a pairing to a random group, which we believe may be of independent interest." @default.
- W4320082912 created "2023-02-12" @default.
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- W4320082912 date "2022-01-01" @default.
- W4320082912 modified "2023-09-27" @default.
- W4320082912 title "Memory-Tight Multi-challenge Security of Public-Key Encryption" @default.
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- W4320082912 doi "https://doi.org/10.1007/978-3-031-22969-5_16" @default.
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