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Electron government affair realized the organization of government,optimized the flow of job,and improved the efficiency about administration, economy and service .There are some risk from element, physics and society. Risk evaluation is one of the most important content about security risk,and plays a very important role in the establish process of information safety.Firstly, this paper summarize the actuality and problem about electron government affair information system safety risk evaluation, analyzed the content and characteristic of the electron government affair information system, consult some rule of law, listed the factor and process of electron government affair information system risk evaluation.Secondly, introduced the mode and way about information safety risk evaluation, about OCTAVE、SSE-CMM、FAT、AHP etc,considering the electron-government-affair is a complicated network system, take digital archives of one city for example, as the information-safety risk-evaluation role,so it is very exact.Thirdly, we carry through asset evaluation, threat evaluation and frangibility evaluation about digital archives system, to get which is important information asset, what is the threat, how to rely on this asset, what is the loss if blow the gaff and bring forward the estimation rule about asset, threat and frangibility, list all kinds of safeguard. At last,combine practice and take numeric archives information safety risk evaluation of a city for example, evaluate the bulk about risk, wish this paper have some value to electron government affair information safety risk evaluation.
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