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Increasingly, today's mobile devices provide users a high level of convenience and flexibility. But, mobile devices are vulnerable to theft and loss, greatly increasing the likelihood of exposing sensitive data. To address this problem, Corner and Noble gave the concept of transient authentication and built a wearable token system, called ZIA system. In this paper, we design a new wearable token system using the idea of transient authentication. Our system not only preserves the same security characteristics as ZIA system, but also is more effective than ZIA system. In our system, careful key management and prudent communication mechanism allow significant performance enhancements. Due to the power constraint of the wearable token and the wireless link, the lower the costs are, the greater the chance of success the wearable token system has in practical implementation. Index Terms--Security system, mobile device, wearable token, transient authentication, key management, communication mechanism.

Very few solutions are known to protect the modular exponentiation for single-chip devices against simple power analysis (SPA) attacks. In this paper, we present a model approach to address the power analysis problem. Using the model approach, we propose a modular exponentiation algorithm, which is secure under the SPA model. Compared with the known solutions, the proposed algorithm is more suitable for real-life applications (1). Index Terms--Single-chip device, side-channel attack, simple power analysis (SPA), model approach, modular exponentiation algorithm.