本文選題：對等網(wǎng)絡(luò)　切入點(diǎn)：Beta信任模型　出處：《安徽師范大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：對等網(wǎng)絡(luò)(簡稱P2P網(wǎng)絡(luò))在分布式存儲、協(xié)同工作、大規(guī)模并行計(jì)算等方面表現(xiàn)出巨大的優(yōu)勢，成為新的研究熱點(diǎn)。然而，P2P具有的開放性、匿名性以及節(jié)點(diǎn)之間松耦合等特點(diǎn)使得節(jié)點(diǎn)可以肆意散布非法內(nèi)容，濫用網(wǎng)絡(luò)資源，，導(dǎo)致節(jié)點(diǎn)之間信任缺失，嚴(yán)重阻礙了P2P的進(jìn)一步發(fā)展。 信任反映的是一個(gè)主體對另一個(gè)主體行為以及能力的綜合評價(jià)，P2P網(wǎng)絡(luò)中節(jié)點(diǎn)之間的信任是促使節(jié)點(diǎn)合作、激勵節(jié)點(diǎn)共享資源的有力保障，直接影響到P2P系統(tǒng)的整體性能。本文主要圍繞P2P環(huán)境下基于貝葉斯理論的信任模型進(jìn)行研究，主要工作如下： (1)應(yīng)用貝葉斯理論中的Beta分布計(jì)算信任度的方法，提出了一種非結(jié)構(gòu)化P2P環(huán)境下的Beta信任模型，該模型通過自適應(yīng)算法構(gòu)建非結(jié)構(gòu)化網(wǎng)絡(luò)拓?fù)�，能夠�(qū)π湃味冗M(jìn)行計(jì)算、存儲以及動態(tài)更新，實(shí)現(xiàn)了完整的信任模型體系結(jié)構(gòu)。 (2)應(yīng)用貝葉斯理論的Dirichlet分布計(jì)算信任度的方法，提出了一種結(jié)構(gòu)化P2P環(huán)境下的Dirichlet雙信任模型，將信任分為服務(wù)信任和反饋信任，用于度量節(jié)點(diǎn)的不同行為，從而提高信任計(jì)算的準(zhǔn)確度。 (3)針對P2P環(huán)境中常見的安全問題，如搭便車(Free Riding)、詆毀(Slander)、共謀(Collusion)、波動攻擊(Oscillation Attack)、策略攻擊(Strategy Attack)等，基于以上惡意行為特有的行為屬性，提出了相應(yīng)的防護(hù)機(jī)制。仿真實(shí)驗(yàn)表明，本文信任模型相對于其他信任模型在抵御這些攻擊方面表現(xiàn)出更好的性能。
[Abstract]:Peer-to-Peer (P2P) network has great advantages in distributed storage, collaborative work and large-scale parallel computing, and has become a new research hotspot. Anonymity and loose coupling between nodes enable nodes to wantonly distribute illegal content abuse network resources and lead to lack of trust between nodes which seriously hinders the further development of P2P. Trust reflects the comprehensive evaluation of the behavior and ability of one entity to another. The trust between nodes in P2P network is a powerful guarantee to encourage nodes to cooperate and encourage nodes to share resources. This paper focuses on the trust model based on Bayesian theory in P2P environment. The main work is as follows:. 1) using the Beta distribution in Bayesian theory to calculate the trust degree, a Beta trust model in unstructured P2P environment is proposed. The model can calculate the trust degree by using adaptive algorithm to construct the unstructured network topology. Storage and dynamic update to achieve a complete trust model architecture. 2) applying the Dirichlet distribution of Bayesian theory to calculate the trust degree, a Dirichlet double trust model in structured P2P environment is proposed, which divides trust into service trust and feedback trust, which is used to measure the different behaviors of nodes. In order to improve the accuracy of trust calculation. 3) aiming at the common security problems in P2P environment, such as free rider, slander, collusion, Oscillation attack, strategy attack and so on, the corresponding protection mechanism is put forward based on the specific behavior attributes of the above malicious acts. The simulation results show that, Compared with other trust models, this trust model has better performance in resisting these attacks.
【學(xué)位授予單位】：安徽師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TP393.08;TP393.02

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