,
Youming Qiao
,
Chuanqi Zhang
Creative Commons Attribution 4.0 International license
In Diffie-Hellman key exchange, the commutativity of power operations is instrumental in the agreement of keys. Viewing commutativity as a law in abelian groups, we propose Diffie-Hellman key exchange in the group action framework (Brassard-Yung, Crypto'90; Ji-Qiao-Song-Yun, TCC'19), for actions of non-abelian groups with laws. The security of this protocol is shown, following Fischlin, Günther, Schmidt, and Warinschi (IEEE S&P'16), based on a pseudorandom group action assumption. A concrete instantiation is proposed based on the monomial code equivalence problem.
@InProceedings{duong_et_al:LIPIcs.ITCS.2026.52,
author = {Duong, Dung Hoang and Qiao, Youming and Zhang, Chuanqi},
title = {{Diffie-Hellman Key Exchange from Commutativity to Group Laws}},
booktitle = {17th Innovations in Theoretical Computer Science Conference (ITCS 2026)},
pages = {52:1--52:20},
series = {Leibniz International Proceedings in Informatics (LIPIcs)},
ISBN = {978-3-95977-410-9},
ISSN = {1868-8969},
year = {2026},
volume = {362},
editor = {Saraf, Shubhangi},
publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
address = {Dagstuhl, Germany},
URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ITCS.2026.52},
URN = {urn:nbn:de:0030-drops-253396},
doi = {10.4230/LIPIcs.ITCS.2026.52},
annote = {Keywords: Diffie-Hellman, Key Exchange, Group Laws, Group Actions, Code Equivalence}
}