May 16, 2024, 7:30 a.m. |


ePrint Report: A Deniability Analysis of Signal's Initial Handshake PQXDH

Rune Fiedler, Christian Janson

Many use messaging apps such as Signal to exercise their right to private communication. To cope with the advent of quantum computing, Signal employs a new initial handshake protocol called PQXDH for post-quantum confidentiality, yet keeps guarantees of authenticity and deniability classical. Compared to its predecessor X3DH, PQXDH includes a KEM encapsulation and a signature on the ephemeral key. In this work we show that PQXDH …

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