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A number of asymmetrical payment methods have been developed to enable mobile users to buy goods online by charging them to their mobile phone bills by their network operators. It has been recognized that these methods must be used in conjunction with the security services of authentication and non-repudiation of the origin of the request(s) sent from a(More)
In this paper, we present a novel joint signature protocol suited to applications run on UMTS and heterogeneous networks. The protocol enables a mobile user to securely delegate his/her signing power to an assisted server so that the assisted server can perform signature generation and verification on behalf of the user. By shifting computational expensive(More)
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