期刊名称：International Journal of Advanced Research in Computer Engineering & Technology (IJARCET)
印刷版ISSN：2278-1323
出版年度：2013
卷号：2
期号：5
页码：1757-1761
出版社：Shri Pannalal Research Institute of Technolgy
摘要：Network coding in Peer-to-Peer content distribution system provides a promising alternative to the traditional store-and-forward transmission paradigm but they suffer from pollution attacks which have detrimental effect on them. Existing systems verify blocks with traditional cryptographic signatures and hashes. However, these techniques do not apply well to more elegant schemes that use network coding techniques for efficient content distribution. In this work, we propose a novel, complete defense system for network coding-based P2P systems that can (i) detect polluted blocks early at intermediate peers (ii) identify the exact location of all colluding peers thus making it possible to eliminate them. (iii) Reduce the cost of verification thus preventing the propagation of malicious blocks. Here users not only cooperate to distribute the content, but (well-behaved) users also cooperate to protect themselves against malicious users by informing affected nodes when a malicious block is found. Our mechanisms introduce significantly less communication and computation overhead than other comparable state-of the- art schemes for P2P systems.
