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- W3187030721 abstract "The key exchange protocol that establishes initial shared secrets in the handshake of the Signal end-to-end encrypted messaging protocol has several important characteristics: (1) it runs asynchronously (without both parties needing to be simultaneously online), (2) it provides implicit mutual authentication while retaining deniability (transcripts cannot be used to prove either party participated in the protocol), and (3) it retains security even if some keys are compromised (forward secrecy and beyond). All of these properties emerge from clever use of the highly flexible Diffie–Hellman protocol. While quantum-resistant key encapsulation mechanisms (KEMs) can replace Diffie–Hellman key exchange in some settings, there is no replacement for the Signal handshake solely from KEMs that achieves all three aforementioned properties, in part due to the inherent asymmetry of KEM operations. In this paper, we show how to construct asynchronous deniable key exchange by combining KEMs and designated verifier signature (DVS) schemes, matching the characteristics of Signal. There are several candidates for post-quantum DVS schemes, either direct constructions or via ring signatures. This yields a template for an efficient post-quantum realization of the Signal handshake with the same asynchronicity and security properties as the original Signal protocol." @default.
- W3187030721 created "2021-08-02" @default.
- W3187030721 creator A5011305569 @default.
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- W3187030721 creator A5062328247 @default.
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- W3187030721 date "2022-01-01" @default.
- W3187030721 modified "2023-10-02" @default.
- W3187030721 title "Post-quantum Asynchronous Deniable Key Exchange and the Signal Handshake" @default.
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- W3187030721 doi "https://doi.org/10.1007/978-3-030-97131-1_1" @default.
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