Encouraging the Adoption of Post-Quantum Hybrid Key Exchange in Network Security

Post-Quantum Cryptography (PQC) is under standardization, and a transition from "classic" cryptography to PQC is likely to occur. Combining classic cryptography with PQC in a Hybrid form can ease such transition. In this context, this research aims at the challenges of designing a Post-Quantum Hybrid Key Exchange (KEX). The focus here is on the hybrid forms and in their adoption in widely-used network protocols. The methodology of this research includes: (1) a systematic review of the challenges of the design of Hybrid KEX; (2) to evaluate proposals in network protocols (such as TLS 1.3); and (3) to provide security analysis for the proposals. It is believed that these hybrids will contribute to the evolution of network security: by giving protection against attackers with or without quantum capabilities but also minimizing possible compatibility issues.