【摘要】：自P2P網(wǎng)絡(luò)問(wèn)世以來(lái),就受到了越來(lái)越多的關(guān)注,現(xiàn)已被使用在各種各樣的網(wǎng)絡(luò)應(yīng)用中。P2P網(wǎng)絡(luò)改變了傳統(tǒng)網(wǎng)絡(luò)中的客戶端/服務(wù)器模式,采用端對(duì)端原則,網(wǎng)絡(luò)中所有實(shí)體之間都是平等的,每個(gè)實(shí)體既是服務(wù)的提供者也是服務(wù)的享用者。然而,P2P網(wǎng)絡(luò)的開放性特點(diǎn)也給其安全性帶來(lái)了影響,阻礙了P2P網(wǎng)絡(luò)的進(jìn)一步發(fā)展。 目前,基于P2P網(wǎng)絡(luò)的文件共享、視頻點(diǎn)播、即時(shí)通信、電子商務(wù)等應(yīng)用逐漸成為一種主流應(yīng)用模式。但在P2P網(wǎng)絡(luò)中存在一些惡意的參與者,他們通過(guò)網(wǎng)絡(luò)傳播病毒,散播廣告等。為了解決這一問(wèn)題,學(xué)者們將人類社會(huì)關(guān)系中信任的概念引入到P2P網(wǎng)絡(luò)中,以模仿人與人之間的信任關(guān)系來(lái)建立網(wǎng)絡(luò)中節(jié)點(diǎn)與節(jié)點(diǎn)之間的信任關(guān)系�，F(xiàn)有的研究表明,信任模型可以在一定程度上解決P2P網(wǎng)絡(luò)中的信任問(wèn)題,遏制節(jié)點(diǎn)的惡意行為。然而,在現(xiàn)有模型中,多采用連續(xù)或離散的單一值刻畫信任,并依據(jù)該信任值做出信任決策,方法過(guò)于簡(jiǎn)單。 本文針對(duì)現(xiàn)有信任模型中存在的信任刻畫粗糙及信任決策方法過(guò)于簡(jiǎn)單的問(wèn)題,提出一種基于有序偏好的P2P網(wǎng)絡(luò)信任模型。首先,將服務(wù)刻畫成n維屬性向量,以便能夠更加細(xì)致地表現(xiàn)節(jié)點(diǎn)在各個(gè)屬性方面的能力；其次,考慮到每個(gè)節(jié)點(diǎn)對(duì)所請(qǐng)求服務(wù)的各屬性可能存在不同偏好這一事實(shí),我們利用AHP(Analytical Hierarchy Process)方法,將定性化的用戶偏好信息轉(zhuǎn)化為定量化的有序偏好,并據(jù)此求出請(qǐng)求節(jié)點(diǎn)的期望向量。最后,將請(qǐng)求節(jié)點(diǎn)的期望向量與每個(gè)響應(yīng)節(jié)點(diǎn)的信任向量進(jìn)行結(jié)合,以計(jì)算出各響應(yīng)節(jié)點(diǎn)的評(píng)估值,以幫助請(qǐng)求節(jié)點(diǎn)進(jìn)行信任決策。 模擬實(shí)驗(yàn)結(jié)果表明,本文的模型能夠有效提高節(jié)點(diǎn)信任決策的滿意度,并能夠有效抵抗節(jié)點(diǎn)的惡意攻擊行為。
[Abstract]:Since the advent of P2P network, more and more attention has been paid to it, which has been used in various network applications. P2P network has changed the client / server mode in traditional network and adopted the end-to-end principle. All entities in the network are equal, and each entity is both a service provider and a service user. However, the open characteristic of P2P network also affects its security and hinders the further development of P2P network. At present, P2P network based file sharing, video on demand, instant messaging, e-commerce and other applications have gradually become a mainstream application mode. However, there are some malicious participants in P2P networks, who spread viruses and advertisements through the network. In order to solve this problem, scholars introduced the concept of trust in human social relations into P2P networks, and established the trust relationship between nodes and nodes in the network by imitating the trust relationship between people. The existing research shows that the trust model can solve the trust problem in P2P network to some extent and restrain the malicious behavior of the nodes. However, in the existing models, it is too simple to use a single continuous or discrete value to describe trust and make a trust decision based on the trust value. In this paper, a P2P trust model based on ordered preference is proposed to solve the problems of rough description of trust and too simple method of trust decision in existing trust models. First, the service is characterized as an n-dimensional attribute vector, so that the ability of the node in each attribute can be represented in greater detail; secondly, considering the fact that each node may have different preferences for each attribute of the requested service, By using the AHP (Analytical Hierarchy Process) method, the qualitative user preference information is transformed into the quantitative ordered preference, and the expectation vector of the request node is obtained. Finally, the expectation vector of the request node is combined with the trust vector of each response node to calculate the evaluation value of each response node to help the requesting node to make the trust decision. The simulation results show that the proposed model can effectively improve the degree of satisfaction of the node trust decision and can effectively resist the malicious attack behavior of the node.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TP393.08

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本文編號(hào)：2291121