Improved multi-party contract signing

[MukhamedovRyan2007Contract] Aybek Mukhamedov and Mark Ryan. Improved multi-party contract signing. In Financial Cryptography and Data Security, volume 4889 of LNCS, pages 179-191, Springer. 2007.
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Available from: ftp://ftp.cs.bham.ac.uk/pub/authors/M.D.Ryan/07-fc07.pdf