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Several security issues arise, due to the design of the Mobile IP and its deployment in conjunction with other network protocols. Most of the work on the security of Mobile IP has focused on authentication of the control packet and the confidentiality of the content in the protocol, and there are not many proposals in the area of location privacy. In this paper, we propose a method to provide location privacy for Mobile IP users. We present two protocols that use an overlay network approach, and designed particularly for Mobile IP. We employ universal re-encryption and extend it to n-out-of-n universal reencryption to achieve our goal. In contrast to other overlay network approaches, where at least n public key encryption are required, our scheme requires only 2 public key encryption operations. Therefore, it is applicable to Mobile IP systems, where in most cases the mobile nodes are small devices and have computational limitation.

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. Towards formalizing a reputation system for cheating detection in peer-to-peerbased massively multiplayer online games. Lecture Notes in Computer Science, 7645 291-304.Towards formalizing a reputation system for cheating detection in peer-topeer-based massively multiplayer online games AbstractThe rapidly growing popularity of Massively Multiplayer Online Games (MMOGs) has given rise to an increase in the number of players world wide. MMOGs enable many players interact together through a shared sense of presence created by the game. The Peer-to-Peer (P2P) network topology overcomes communication bottleneck problems associated with centralized client/server sys-tems. Thus, P2P-based MMOGs are seen as the way of the future, and many dierent P2P-based MMOG architectures have been proposed to date. However, many architectures are proposed in an ad hoc manner and enhancing the security of such systems is an elusive research problem. In this paper, we address this important issue by making the following contributions. Firstly, we formalize the notion of P2P-based MMOGs and demonstrate that existing P2P-based MMOG architectures can be unied using our model. To our knowledge, this is the rst time that this has been done in the literature. Secondly, we use our model to develop a real-time cheating detection mechanism to identify cheating players, which can be used to expose several MMOG cheating strategies. Finally, we propose a new reputation based system for P2P-based MMOGs to enhance the cheating detection process. Abstract. The rapidly growing popularity of Massively Multiplayer Online Games (MMOGs) has given rise to an increase in the number of players world wide. MMOGs enable many players interact together through a shared sense of presence created by the game. The Peer-to-Peer (P2P) network topology overcomes communication bottleneck problems associated with centralized client/server systems. Thus, P2P-based MMOGs are seen as the way of the future, and many different P2P-based MMOG architectures have been proposed to date. However, many architectures are proposed in an ad hoc manner and enhancing the security of such systems is an elusive research problem. In this paper, we address this important issue by making the following contributions. Firstly, we formalize the notion of P2P-based MMOGs and demonstrate that existing P2P-based MMOG architectures can be unified using our model. To our knowledge, this is the first time that this has been done in the literature. Secondly, we use our model to develop a real-time cheating detection mechanism to identify cheating players, which can be used to expose several MMOG cheating strategies. Finally, we propose a new reputation based system for P2P-based MMOGs to enhance the cheating detection process.