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—Authentication and authorization are two of the most important security features for mobile transaction systems. Most commonly, these schemes depend on three factors: what you know (secret), what you have (token), and what you are (biometrics). In this paper, we propose a location-based authentication and authorization scheme for mobile transactions using(More)
Security is an important factor for the wide acceptance of the electronic commerce services. Special security mechanisms are needed for the implementation of secure electronic payment systems that permit the integration of the electronic transactions. In the framework of the information brokerage system that has been developed by the GAIA project of the(More)