# Refining Authenticated Key Agreement with Strong Adversaries

 Title: Refining Authenticated Key Agreement with Strong Adversaries Authors: Joseph Lallemand (joseph /dot/ lallemand /at/ loria /dot/ fr) and Christoph Sprenger (sprenger /at/ inf /dot/ ethz /dot/ ch) Submission date: 2017-01-31 Abstract: We develop a family of key agreement protocols that are correct by construction. Our work substantially extends prior work on developing security protocols by refinement. First, we strengthen the adversary by allowing him to compromise different resources of protocol participants, such as their long-term keys or their session keys. This enables the systematic development of protocols that ensure strong properties such as perfect forward secrecy. Second, we broaden the class of protocols supported to include those with non-atomic keys and equationally defined cryptographic operators. We use these extensions to develop key agreement protocols including signed Diffie-Hellman and the core of IKEv1 and SKEME. BibTeX: @article{Key_Agreement_Strong_Adversaries-AFP, author = {Joseph Lallemand and Christoph Sprenger}, title = {Refining Authenticated Key Agreement with Strong Adversaries}, journal = {Archive of Formal Proofs}, month = jan, year = 2017, note = {\url{https://isa-afp.org/entries/Key_Agreement_Strong_Adversaries.html}, Formal proof development}, ISSN = {2150-914x}, } License: GNU Lesser General Public License (LGPL)