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Security Analysis of Signal's PQXDH Handshake
May 10, 2024, 3:06 a.m. |
IACR News www.iacr.org
ePrint Report: Security Analysis of Signal's PQXDH Handshake
Rune Fiedler, Felix Günther
Signal recently deployed a new handshake protocol named PQXDH to protect against "harvest-now-decrypt-later" attacks of a future quantum computer. To this end, PQXDH adds a post-quantum KEM to the Diffie-Hellman combinations of the prior X3DH handshake.
In this work, we give a reductionist security analysis of Signal's PQXDH handshake in a game-based security model that captures the targeted "maximum-exposure" security, allowing fine-grained compromise of user's long-term, semi-static, and …
analysis attacks computer decrypt diffie end eprint report future handshake harvest hellman post-quantum protect protocol quantum quantum computer report security security analysis signal work
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