A blueprint for constructing 3-pass AKE protocols under commitment-based models

Computer Science > Cryptography and Security [Submitted on 22 May 2026] A blueprint for constructing 3-pass AKE protocols under commitment-based models Rodrigo Martín Sánchez-Ledesma The commitment-based AKE model provides a formal security framework for key exchange protocols that avoid long-term cryptographic material, achieving authentication through a final out-of-band verification of session-derived values. Within this model, secure KA-based and KEM-based protocols were previously constructed via a commitment-based MT compiler, yielding optimized 4-pass protocols. In this work, we show that 3-pass protocols secure under this model exist for both primitives. These protocols are constructed ad hoc, following the core ideas of the commitment-based MT authenticator, and their SK security in the unauthenticated model is proved using the same game-based techniques, achieving bounds of the same form as those previously achieved. The resulting protocols provide one-way authentication in three message exchanges. Subjects: Cryptography and Security (cs.CR) Cite as: arXiv:2605.23843 [cs.CR]   (or arXiv:2605.23843v1 [cs.CR] for this version)   https://doi.org/10.48550/arXiv.2605.23843 Focus to learn more Submission history From: Rodrigo Martín Sánchez-Ledesma [view email] [v1] Fri, 22 May 2026 16:51:59 UTC (30 KB) Access Paper: HTML (experimental) view license Current browse context: cs.CR < prev   |   next > new | recent | 2026-05 Change to browse by: cs References & Citations NASA ADS Google Scholar Semantic Scholar Export BibTeX Citation Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer (What is the Explorer?) Connected Papers Toggle Connected Papers (What is Connected Papers?) Litmaps Toggle Litmaps (What is Litmaps?) scite.ai Toggle scite Smart Citations (What are Smart Citations?) Code, Data, Media Demos Related Papers About arXivLabs Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?)