摘要随着科学技术的飞速发展，网络传感器技术已经被应用在各个领域。与其同时，安全问题也随着增加。单纯的密码技术的安全体系无法抵挡来自系统内部由于节点的被俘获而产生的攻击，建立有效的信任机制来识别恶意节点，保护网络的安全性是目前网络安全问题的重中之重。66100

本文介绍了运用在Ad hoc网络和无线传感器网络中的信任机制模型，对国内外研究学者提出的各种信任模型进行分析和比较。选择其中一种基于自适应遗忘机制的半环信任模型，该模型在可以进行直接和间接可信度计算的同时，还通过引入遗忘因子使得可信度具有动态性，提高网络的实时监测能力，增强了网络的安全性。

本文对它其中的可信度计算进行了介绍和说明，并使用MATLAB软件进行了仿真，证实这种模型对监测异常节点并进行有效抵御有着极大的作用。

毕业论文关键词  Ad hoc网络  无线传感器网络  信任模型  自适应遗忘机制 半环

毕业设计说明书（论文）外文摘要

Title    Computations and applications of turst in networks     with open environment                                                

Abstract

With the rapid development of science and technology，sensor technology has been used various fields. In the same time, security issues are becoming important. Encryption-based security mechanisms can’t resolve internal attacks that caused by nodes been captured sometimes. Therefore, we need to establish an effective trust mechanism for distinguish captured nodes from networks timely. Protecting the security of network is one of the most important issues nowadays.

In this paper, we propose various trust models of Ad hoc network and WSNs. Analysis and comparison all the trust models proposed by academics from around the word. One of them is semi-ring trust model based on adaptive forgetting scheme, forgetting factor is introduced in this models to improve the security of networks.

Calculating of the trust value is also introduced and descripted in this paper. Finally, we verified that this model distinguishes malicious nodes and resists on-off attacks effectively, which improves the security of Ad

Hoc networks

Keywords :Ad hoc Networks  Wireless Sensor Networks  Trust Model  Adaptive Forgetting Scheme  Semi-ring

目   录

1  绪论 2

1.1  研究背景 2

1.2.1  无线传感器网络中基于信任模型的自适应拓扑控制算法研究 3

1.2.2  无线传感器网络中的分组多层次信任模型研究 4

1.2.3  基于自适应遗忘机制的半环信任模型 4

1.3  研究内容和研究目标 4

1.4  论文章节结构 5

1.5  本章小结 6

2  开放型网络的信任机制 6

2.1  Ad hoc网络 6

2.1.1  Ad hoc网络的概念 6

2.1.2  Ad hoc网络的应用 6

2.2  无线传感器网络 7

2.2.1  无线传感器网络的概念 7

2.2.2  无线传感器网络的应用