Research Of Network Dependability Evaluation Based On Event Injection

Development of network technology and expansion of network applications make the architectures of network system become more complicated and users' requirement on network much higher, and hence the trustiness degree of network systems shows more importance. Traditional reliability evaluation can not reflect the trustiness degree of network any longer, how to evaluate network dependability has become an emphasis in dependability researches. Besides of reliability, the concept of dependability is further perfected. The attributes of availability, safety, security and maintainability are added into it, which make the dependability evaluation more difficult. The objects of dependability evaluation include network hardware, software and human factors, and the evaluation is of multi-attribute and multi-index features. After systematically studying and summarizing the newest research, this paper deeply studies the dependability evaluation, the work are mainly listed as follows:Firstly, development of research on dependability and its related concepts is introduced, including concepts of dependability, trusted computing, trustworthy computing and survivability. Research and findings related to dependability evaluation are summarized, including research progress or findings on hardware reliability evaluation in network system, software reliability evaluation, network security and safety evaluation, and then shortcomings of current research on dependability evaluation are pointed out.Secondly, by analyzing the existing researches, dependability evaluation index framework of computer network is constructed, which includs reliability, availability, safety, security and maintainability of hardware and software, and this framework contains all attributes and important evaluation indexes of network dependability evaluation. Thirdly, to meet the requirements of network dependability evaluation, event injection model used in network dependability evaluation is proposed and consummated. Differences between event injection model and traditional fault injection model and the advantages of event injection model are analyzed, key technologies are proposed and event injection system used to evaluate the network dependability is designed.Fourthly, applying event injection technology, experimental researches on evaluating of some attributes of network system dependability are carried out. Experimental results validate that the event injection model is valid and feasible.At last, considering the influences of multi-attribute, multi-index and multi-factors on network dependability evaluation, fuzzy comprehensive evaluating is introduced into the network dependability evaluation.In a word, research on network dependability evaluation is in an immature stage, and this paper intends to construct an integrated and feasible dependability evaluation index framework, proposes a novel network dependability evaluation model, and carries out some research on experimental schemes. The work done in this paper can set up the foundation for future network dependability evaluation.