K-Waay: Fast and Deniable Post-Quantum X3DH without Ring Signatures

ePrint Report: K-Waay: Fast and Deniable Post-Quantum X3DH without Ring Signatures

Daniel Collins, Loïs Huguenin-Dumittan, Ngoc Khanh Nguyen, Nicolas Rolin, Serge Vaudenay

The Signal protocol and its X3DH key exchange core are regularly used by billions of people in applications like WhatsApp but are unfortunately not quantum-secure. Thus, designing an efficient and post-quantum secure X3DH alternative is paramount. Notably, X3DH supports asynchronicity, as parties can immediately derive keys after uploading them to a central server, and deniability, allowing parties to …

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