A New Primitive for a Diffie-Hellman-like Key Exchange Protocol Based on Multivariate Ore Polynomials
This addresses security vulnerabilities in post-quantum cryptography for users needing robust key exchange, though it is incremental as it builds on prior work.
The paper tackles the problem of securing key exchange protocols based on non-commutative polynomial rings by introducing a new primitive immune to known attacks, such as those by Dubois and Kammerer, while extending the work of Boucher et al. to allow flexibility in ring choice and application to multiple cryptographic paradigms.
In this paper we present a new primitive for a key exchange protocol based on multivariate non-commutative polynomial rings, analogous to the classic Diffie-Hellman method. Our technique extends the proposed scheme of Boucher et al. from 2010. Their method was broken by Dubois and Kammerer in 2011, who exploited the Euclidean domain structure of the chosen ring. However, our proposal is immune against such attacks, without losing the advantages of non-commutative polynomial rings as outlined by Boucher et al. Moreover, our extension is not restricted to any particular ring, but is designed to allow users to readily choose from a large class of rings when applying the protocol. Our primitive can also be applied to other cryptographic paradigms. In particular, we develop a three-pass protocol, a public key cryptosystem, a digital signature scheme and a zero-knowledge proof protocol.