In the IEEE 802.11 WLAN, a mobile station (MS) performs a handover whenever it moves out of range of one access point (AP). However, channel scanning which discovers the new available APs is the dominating factor in handover latency, accounting more than 90% of overall latency. In order to reduce such a scanning latency, we focus on the method reducing the number of channels for the MS in handover process to scan. With the help of IEEE 802.21 information server (IS), a proper scanning order of channels is offered by the current AP. By using this scanning order, the passive scanning of a MS in normal operation enables the MS to filter out the unavailable channels, and thus to prepare the reliable group of channels to scan during the future handover process. Simulation results show that our proposed scanning group and order decision method reduces the scanning latency in handover process compared to the conventional scheme.
Mobile environments are evolving the main communication environment as a develops of communication technology. In mobile environments, sensitive information can be compromised on-line, so demand for security has increased. Also, mobile devices that provide various services are in danger from malware and illegal devices, phishing and sniffing etc, and the privacy. Therefore, MTM(Mobile Trusted Module) is developed and promoted by TCG(Trusted Computing Group), which is an industry standard body to enhance the security level in the mobile computing environment. MTM protects user privacy and platform integrity, because it is embedded in the platform, and it is physically secure. However, a security approach is required when secret data is migrated elsewhere, because MTM provides strong security functions. In this paper, we analyze the TCG standard and migration method for cryptographic key, then we propose a secure migration scheme for cryptographic key using key Backup/Recovery method.
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