Resolve-Impossibility for a Contract-Signing Protocol

[MukhamedovRyan2006] Aybek Mukhamedov and Mark Ryan. Resolve-Impossibility for a Contract-Signing Protocol. In 19th Computer Security Foundations Workshop (CSFW), pages 167-176, IEEE Computer Society Press. 2006.
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Available from: ftp://ftp.cs.bham.ac.uk/pub/authors/M.D.Ryan/06-csfw2.pdf