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When it comes to the information society, Internet is one of the biggest push issue to the transform. Key aspects were the increased availability of computer networks and the trend towards teamwork. So comes out the CSCW technique. EC is one of the typical uses of CSCW, so the paper introduces the basic conception of CSCW and EC, and then gives the secure analysis to EC, emphasis on the techniques of it. Then the paper gives a detailed analysis on mobile EC, it's the tendency of EC, gives out the PKI and other techniques used in mobile EC to solve the secure problems.