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Peer-To-Peer Storage: Security and Protocols (Computer Science, Technology and Applications)

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Peer-to-peer (P2P) has proven as a most successful way to produce large scale, reliable, and cost-effective applications, as illustrated for file sharing or VoIP. P2P storage is an emerging field of application which allows peers to collectively leverage their resources towards ensuring the reliability and availability of user data. Providing assurances in both domains requires not only ensuring the confidentiality and privacy of the data storage process, but also thwarting peer misbehavior through the introduction of proper security and cooperation enforcement mechanisms. Misbehavior may consist in data destruction or corruption by malicious or free-riding peers. Additionally, a new form of man-in-the-middle attack may make it possible for a malicious peer to pretend to be storing data without using any local disk space. New forms of collusion also may occur whereby replica holders would collude to store a single replica of some data, thereby defeating the requirement of data redundancy. Finally, Sybil attackers may create a large number of identities and use them to gain a disproportionate personal advantage.The continuous observation of peer behavior and monitoring of the storage process is an important requirement to secure a storage system. Observing peer misbehavior requires appropriate primitives like proofs of data possession, a form of proof of knowledge whereby the holder interactively tries to convince the verifier that it possesses the very data without actually retrieving them or copying them at verifier’s memory. We present a survey of such techniques and discuss their suitability for assessing remote data storage.



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