基于可靠性理论的双枝模糊pctri网攻击模型分析-analysis of bi-branch fuzzy pc tri network attack model based on reliability theory.docx

Study of Fuzzy Petri Net Attack Models ?ased onReliability and Both-branch Fuzzy Set TheoryMajor:Management Science and EngineeringName:Wang JinchcngInstructor:Prof.Huang GuangqiuAbstractWith the increasing ly serious problem of network security，network attack on the defense put forward ever-increasi ng demands. In order to design a higher security，more comprehensive network defen se system，de巳p and systematic understanding of attacking process is needed urgently，and the concept ofNetwork Attack Model is prcsented. This pape飞 on the basis of prev ious research ，establishes Nelwork Attack Model with formalized method p巳tri Net，combined both -branch fuzzy set theory and reliabi litytheory.Bccausc Both-branch fuzzy set applicated in attack modcl can expand attacking effect factors from the single espect of promoting attack to both espects of promoting and counteracting aαa饨，it describes attacking process more acωally. In this paperrel iability theory is introduced 10 altacking model ，which develops attacking modelfrom static to dynamic.Firstly，some common limitations of previous attack model based on Petri Net is pointed out，and a new consislenl Network Attack model-CBBVFP，which based on both-branch fuzzy set and fuzzy Petri Nct ，is establishcd. This model extends the two basic structure AND and OR，and meanwhi le introduces several methods to avoid the inconsistency in this attack model. Besides，for consistency necessary，new formulaof reasoning propositions truth degree and reasoning algorithm of model are presented . Secondly，from the reliability point of view，this paper mak臼 use of fuzzy timed Petri net (FTPN) to m础e a dynamic reliability network attack model-DRFTPN. Comparing with previous attack models，the obvious improvement of DRFTPN is introducing thetime factor，which improves static models to dynamic models. In tbe new model，anattacking process is described 出 an unrcpairablc complicated system ，and attackingstates described by Pla