RT Journal Article
T1 HM-AKA+: Protecting against a semi-trusted third party with  Hybrid Crypto
A1 Munilla-Fajardo, Jorge
A1 Braeken, An
K1 Sistemas de telecomunicaciones
AB Hybrid protocols that combine Post-Quantum (PQ) and traditional primitives, allowing flexible switching based on the threat level, provide optimal trade-offs between efficiency and security. The recently published HM-AKA scheme introduced a basic framework for this setup, but it fails to provide security against impersonation attacks by a semi-trusted TTP in some of its proposed modes. This vulnerability arises due to the asymmetric behavior of PQ primitives compared to traditional public-key primitives. We identify this threat and propose an enhanced version, HM-AKA+, that maintains the framework’s flexibility while ensuring security.
PB Springer
YR 2026
FD 2026
LK https://hdl.handle.net/10630/46329
UL https://hdl.handle.net/10630/46329
LA eng
NO Munilla, J., Braeken, A. HM-AKA+: Protecting against a semi-trusted third party with Hybrid Crypto. Cryptogr. Commun. (2026)
NO Funding for open access publishing: Universidad de Málaga/CBUA
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 12 abr 2026