University of Twente Student Theses


The Post-Quantum Signal Protocol : Secure Chat in a Quantum World

Duits, Ines (2019) The Post-Quantum Signal Protocol : Secure Chat in a Quantum World.

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Abstract:The Signal Protocol provides end-to-end encryption, forward secrecy, backward secrecy, authentication and deniability for chat applications like WhatsApp. The Signal Protocol does this by using the ECDH Curve25519 key exchanges and SHA-512 key derivation. However, the ECDH key exchange is not quantum-safe. A post-quantum Signal Protocol requires a substitute for the ECDH key exchanges. Therefore, we look at post-quantum cryptography, which is secure against a quantum computer. In this thesis we analyse the Signal Protocol and explain our research. We compared 11 different post-quantum algorithms: SIDH and 10 different key encapsulation mechanism, which are in the NIST post-quantum standardisation process: BigQuake, BIKE, Frodo, Crystal-Kyber, Leda, Lima, New Hope, Saber, SIKE and Titanium. We conclude that it is feasible to have different post-quantum Signal Protocols considering the state of 2018 for an average user.
Item Type:Essay (Master)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:54 computer science
Programme:Computer Science MSc (60300)
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