本文選題：本體 + 上下文��； 參考：《曲阜師范大學》2014年碩士論文

【摘要】：云計算是一種融合分布式計算、網格計算和并行計算等技術的新型商業(yè)計算模式，它利用虛擬化技術，將存儲資源、計算資源、網絡資源和應用資源等以服務的形式對外發(fā)布。云計算用戶可以“輕而易舉”獲取“彈性且無處不在”的服務。 云計算的服務思想一方面可以縮短用戶重新部署或升級IT資源的時間，另一方面可以降低軟件和基礎設施成本，從而在時間和空間上都能給用戶帶來極大的益處。然而，云計算服務在提供上述優(yōu)勢的同時帶也來了新的安全問題：由于服務相對于用戶來說是位置、應用透明的，不受用戶直接控制，因而用戶既擔心存放到云端的隱私信息和核心數(shù)據(jù)被泄露，又質疑與之共享、交互服務的可信度。由此可見，無論是用戶利用云計算平臺進行數(shù)據(jù)存儲、科學計算，還是與其他用戶協(xié)作完成自己的作業(yè)任務，信任都成為不得不考慮的重要問題。 在保持云服務優(yōu)勢的同時，針對如何提高交互服務間的信任度，本文從云計算的視角對信任機制做了如下四方面的研究： 第一，針對云計算環(huán)境，對信任及信任關系進行了詳細研究，給出了綜合服務消費者動機（需求信息和反饋信息等）、行為上下文（交互時間、歷史交易記錄和軟硬件環(huán)境等）和服務自身質量（SLA和QoS等）有關的信任要素構造信任本體的方法。 第二，從云服務的角度對信任管理模型進行分類，在分類的基礎上，，構建了一種融合云服務的信任管理架構，并詳細分析了該架構所包含的與信任有關的要素。 第三，給出了一種云計算環(huán)境下基于上下文本體的信任評估方法。該方法利用本體既可以對屬性進行一致性語義描述，又可以借助時間和交互次數(shù)對信任進行動態(tài)評估。利用信任本體具有的語義特性和推理機制，描述了信任評估的具體過程。 第四，提出了一種基于本體的自動信任協(xié)商模型，該模型從本體自身的特點和本體信息的傳輸過程兩個層面對敏感信息進行保護。 總之，本文從云服務協(xié)作的角度對信任有關的關鍵要素進行分類和綜合，構建了信任本體；對信任管理模型從策略、推薦、聲譽和預測四個角度進行分析，提出了一種適合云計算環(huán)境的信任管理分層架構，并將信任本體中的信任要素與本文提出的信任管理模型的三層架構進行了對應和分析，對云環(huán)境的安全建設具有理論和實踐意義；利用信任本體記錄服務的運行和交互的歷史信息，提出了一種基于本體的信任度評估方法，用仿真實驗驗證了該方法的有效性；利用本體自身的層次性，從信任協(xié)商的請求和應答兩個層面對敏感信息保護的策略進行了詳述。為進一步保證敏感信息在傳輸過程層面的安全性，提出了一種基于本體的自動信任協(xié)商模型。
[Abstract]:Cloud computing is a new business computing model which combines distributed computing, grid computing and parallel computing. It uses virtualization technology to release storage resources, computing resources, network resources and application resources as services. Cloud computing users can easily access "flexible and ubiquitous" services. On the one hand, the service idea of cloud computing can shorten the time for users to redeploy or upgrade IT resources, on the other hand, it can reduce the cost of software and infrastructure, which can bring great benefits to users in time and space. However, cloud computing services offer these advantages with new security issues: because the service is located relative to the user, the application is transparent and not directly controlled by the user. Therefore, users not only worry that the privacy information and core data stored in the cloud will be leaked, but also question the credibility of the interactive services. It can be seen that whether users use cloud computing platform for data storage, scientific computing, or cooperate with other users to complete their own tasks, trust has become an important issue to be considered. While maintaining the advantage of cloud service, aiming at how to improve the trust degree between interactive services, this paper makes the following four aspects of research on trust mechanism from the perspective of cloud computing: Firstly, trust and trust relationship are studied in detail in cloud computing environment, and the comprehensive service consumer motivation (requirement information and feedback information), behavior context (interaction time, etc.) are given. The method of constructing trust ontology is based on the historical transaction record and software / hardware environment) and the quality of service (SLA and QoS etc.). Secondly, the trust management model is classified from the point of view of cloud service. On the basis of the classification, a trust management architecture integrating cloud services is constructed, and the factors related to trust are analyzed in detail. Thirdly, a trust evaluation method based on context ontology in cloud computing environment is presented. In this method, ontology can be used not only to describe attribute consistency semantics, but also to evaluate trust dynamically by time and interaction times. The process of trust evaluation is described by using the semantic characteristics and reasoning mechanism of trust ontology. Fourthly, an automatic trust negotiation model based on ontology is proposed, which protects sensitive information from two aspects: ontology's own characteristics and ontology's information transmission process. In a word, this paper classifies and synthesizes the key elements related to trust from the perspective of cloud service collaboration, constructs trust ontology, and analyzes trust management model from four angles: policy, recommendation, reputation and prediction. In this paper, a trust management hierarchical architecture suitable for cloud computing environment is proposed, and the trust elements in the trust ontology are compared with the three-tier framework of the trust management model proposed in this paper. It has theoretical and practical significance for the security construction of cloud environment, and uses trust ontology to record the running and interactive historical information of the service, proposes an ontology-based trust evaluation method, and verifies the effectiveness of the method by simulation experiments. Based on the hierarchy of ontology, the strategy of protecting sensitive information is described in detail from two levels: request and response of trust negotiation. In order to ensure the security of sensitive information in the transmission process, an ontology based automatic trust negotiation model is proposed.
【學位授予單位】：曲阜師范大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TP393.08

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