Abstract. Many visual similarity-based phishing page detectors have been developed to detect phishing webpages, however, scammers now create polymorphic phishing pages to breach the defense of those detectors. We call this kind of countermeasure phishing page polymorphism. Polymorphic pages are visually similar to genuine pages they try to mimic, but they use different representation techniques. It increases the level of difficulty to detect phishing pages. In this paper, we propose an effective detection mechanism to detect polymorphic phishing pages. In contrast to existing approaches, we analyze the layout of webpages rather than the HTML codes, colors, or content. Specifically, we compute the similarity degree of a suspect page and an authentic page through image processing techniques. Then, the degrees of similarity are ranked by a classifier trained to detect phishing pages. To verify the efficacy of our phishing detection mechanism, we collected 6, 750 phishing pages and 312 mimicked targets for the performance evaluation. The results show that our method achieves an excellent detection rate of 99.6%.

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In this work we propose a seamless vertical handoff solution. We realize the seamlessness by adding a virtualinterface module into current Linux kernel. Different from the mobile-IP based-vertical-handoff systems, there is no need of extra agents or handoff servers in our system. In the experiment, we show that the handoff latency is so short that it is unnoticeable to the applications. Rebuilding transport layer connections is also not required during the period of the handoff. Our system is simple and can be applied to current IP network. Therefore, it is instantly ready for real-world deployment.

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Abstract-The critical tasks in designing a real-time communication system, such as online games, voice chat, and video conference applications, is to keep the end-to-end delay and jitter as low as possible. Delays and jitters are usually caused by network congestion and packet losses. A packet loss event will trigger the timeout retransmission mechanism at the transport layer, however, it is time consuming. Therefore, it is important to detect a loss event and do the retransmission efficiently. To achieve this goal, we propose a Bayesian loss detection mechanism based on the round trip time. We show that our loss detector can achieve high accuracy and high probability of detection as the false alarm ratio is lower than 20%. In addition, we also present a piggyback scheme for packet retransmission. Cooperated with the loss detector, the piggyback scheme can reduce the end-to-end delay and jitter to less than half of that of the original real-time communication system. Moreover, it generates few overheads to the network.