【摘要】：信任模型在網(wǎng)絡(luò)安全問題中具有舉足輕重的地位。網(wǎng)格技術(shù)的出現(xiàn)，使得對用戶的管理方式已經(jīng)不再是集中的、封閉的、可控的管理方式，傳統(tǒng)的信任模型已不能較好地解決網(wǎng)格中所面臨安全問題。網(wǎng)格環(huán)境中的信任問題已經(jīng)成為當(dāng)前網(wǎng)格安全研究的一個熱點。 本文首先分析了分布式環(huán)境下信任模型研究的現(xiàn)狀；其次總結(jié)出當(dāng)前信任模型的利弊及所涉及的問題；最后從信任的定義、信任的屬性、信任的計算等方面出發(fā)，提出了基于虛擬域的網(wǎng)格多維信任模型與基于模糊綜合評判的網(wǎng)格多維信任模型，并分析了后者模型的優(yōu)勢。 本文主要的工作如下： 1.將信任的多維概念引入到基于虛擬域的信任模型中，提出了一種基于信任域的網(wǎng)格多維信任模型。由于不同的目標(biāo)節(jié)點要求服務(wù)的內(nèi)容不同，因此，在計算請求節(jié)點的信任度時，從不同的方面計算請求節(jié)點的信任度更符合目標(biāo)節(jié)點的需求。 2.在基于虛擬域的多維信任模型中，對于域內(nèi)推薦信任，如果鄰居節(jié)點已知，則可以通過鄰居節(jié)點的推薦直接獲取目標(biāo)節(jié)點的信任值；否則，信任代理將作為推薦者，即節(jié)點完全相信信任代理的推薦。這樣可大大減輕信任代理的推薦負(fù)擔(dān)。對于域間推薦信任，本文利用最短路徑最大信任值的方法，簡化了推薦信任的計算方法，，降低了網(wǎng)格性能的消耗。 3.鑒于信任所具有的不確定性與主觀性，提出了基于模糊綜合評判的網(wǎng)格多維信任模型，該方法利用模糊理論表達(dá)網(wǎng)格中信任的不確定性，并且借用模糊數(shù)學(xué)中的綜合評判計算請求節(jié)點的信任度。在該模型中，利用格貼近度公式來計算推薦節(jié)點的權(quán)值，結(jié)果表明推薦節(jié)點的信任權(quán)值更加準(zhǔn)確合理，進(jìn)一步增強(qiáng)了信任值的客觀性。
[Abstract]:Trust model plays an important role in network security. With the advent of grid technology, the management of users is no longer centralized, closed and controllable. The traditional trust model can not solve the security problems in the grid. Trust in grid environment has become a hot topic in grid security research. Firstly, this paper analyzes the current situation of trust model research in distributed environment, and then summarizes the advantages and disadvantages of the current trust model and the problems involved in it. Finally, from the definition of trust, the attributes of trust and the calculation of trust, this paper proposes a grid multidimensional trust model based on virtual domain and a grid multidimensional trust model based on fuzzy comprehensive evaluation, and analyzes the advantages of the latter model. The main work of this paper is as follows: 1. The multidimensional concept of trust is introduced into the trust model based on virtual domain, and a grid multidimensional trust model based on trust domain is proposed. Because different target nodes require different contents of service, when calculating the trust degree of the request node, the trust degree of the request node can be calculated from different aspects more in line with the needs of the target node. 2. In the multi-dimensional trust model based on virtual domain, if the neighbor node is known, the trust value of the target node can be obtained directly by the recommendation of the neighbor node. Otherwise, the trust agent will act as a recommendation, that is, the node completely believes in the recommendation of the trust agent. This can greatly reduce the trust agent recommendation burden. For inter-domain recommendation trust, the shortest path maximum trust value method is used to simplify the calculation method of recommendation trust and reduce the grid performance consumption. 3. In view of the uncertainty and subjectivity of trust, a multi-dimensional trust model based on fuzzy comprehensive evaluation is proposed. The fuzzy theory is used to express the uncertainty of trust in grid. And the trust degree of the request node is calculated by the comprehensive evaluation in fuzzy mathematics. In this model, the weight of the recommended node is calculated by using the lattice-closeness formula. The results show that the trust weight of the recommendation node is more accurate and reasonable, and the objectivity of the trust value is further enhanced.
【學(xué)位授予單位】：曲阜師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TP393.08

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