During the last few years, it has become more and more conpeling in mobile commerce applications, mobile commerce technology is convenient, but also produces a series of security compromise. Payment is an important part of the network security. In this paper, we proposed a secure roaming payment protocol based on IBS, which considers effective mutual authentication between customer and the forge in domain bank and realizes roaming payment. Based on IBS signature, a signature and verification scheme is designed in one round mutual authentication and roaming payment. Security analysis shows, basing on the security of IBS, the proposed protocol with universally compos able(UC)model", "it proves that the proposed protocol satisfies the definition of UC security defined in the UC model. scheme is sufficient for private key privacy, signature unforgeability.
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