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Being the hottest issue of today's time there as a lot of work to be done on mobile commerce. In mobile commerce mobile is used to avail a lot of services. One of these services includes online purchasing of different items. Mobile subscribers can by items anywhere at any time by using their mobile. The bills are compensated by their network operators. Different security issues are involved during such transactions. One of the issues that of non-repudiation. This service prevents the sender and receiver to deny their participation in the transaction and to ensure the integrity of the message. This paper represents the mechanism for non-repudiation in m-commerce using joint signatures.
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