Title :
Formal analysis of multi-party contract signing
Author :
Chadha, Rohit ; Kramer, S. ; Scedrov, Andre
Author_Institution :
Sussex Univ., London, UK
Abstract :
We analyze the multi-party contract-signing protocols of Garay and MacKenzie (GM) and of Baum and Waidner (BW). We use a finite-state tool, MOCHA, which allows specification of protocol properties in a branching-time temporal logic with game semantics. While our analysis does not reveal any errors in the BW protocol, in the GM protocol we discover serious problems with fairness for four signers and an oversight regarding abuse-freeness for three signers. We propose a complete revision of the GM subprotocols in order to restore fairness.
Keywords :
contracts; digital signatures; formal verification; protocols; temporal logic; Baum-Waidner protocol; Garay-MacKenzie protocol; Garay-MacKenzie subprotocols; MOCHA; abuse-freeness; fairness restoration; finite-state tool; formal analysis; game semantics; multiparty contract-signing protocols; temporal logic; Computer networks; Contracts; Electronic mail; Error correction; Logic; Protection; Protocols; Waste materials;
Conference_Titel :
Computer Security Foundations Workshop, 2004. Proceedings. 17th IEEE
Print_ISBN :
0-7695-2169-X
DOI :
10.1109/CSFW.2004.1310746
