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With the economy developing and popular Internet, the general concept of contract signing has changed. In the past, people usually sign a contract at the same time and same place face to face, but actually each party involved in contract may live in different part of earth, they want to sign something for business or some other things in economic, efficient, secure and fairway. A fair contract signing protocol allows two potentially mis-trusted parities to exchange their commitments (i.e.,doi:10.5121/ijnsa.2012.4509 fatcat:okwvb635cngzfdbwzvo4rk2lgm