E-mail Anti-virus Gateway

With the swift and violent development of Internet, e-mail has been becoming thefastest and most economical modern way for communication. It offers people greatconvenience. However, e-mail begins to be the carrier of Spam, virus, the maliciousprogram or some secret mails, which fiercely threaten the safety of the computersystem. So how to solve its security problem properly has become a significant andpractical topic. The e-mail antivirus gateway is one of the key technologies used to weaken oreliminate these troubles. So this essay demonstrate how to establish and finish such asystem in 64 bytes mips platform by making analysis and research to the keytechniques related to the e-mail antivirus gateway from the view of softwareengineering. First, this essay discusses the current situation and the harm of e-mail virus, depictsthe history of the e-mail virus and anti e-mail virus and put forwards some measures,some key techniques as well. Simultaneously, it gives analyses and studies to the e-mailsystem and structure, especially takes a penetrating study on the e-mail virus from theburst mode and hiding techniques, in addition, has established the e-mail antivirusgateway model. Next, the essay makes a detailed introduction and analysis of the separation of thee-mail content according to the following process: hacking network package, protocolanalysis, recombine, and the separation of the e-mail content. Moreover, make a systemdesign of the module according to the following object: the modularization, the highperformance and so on. Finally, the essay presents analysis and research on the function demand andperformance demand of the virus scan engine from the view of virus library and virusdetecting engine. It gives a detailed description by demonstrating the safety of the viruslibrary, the form of the virus character, the structure of the virus library, and the load ofthe virus library. It provides the effective way and process to analyze the virus detectingengine by the idiographic virus detecting method, rapid matching arithmetic, and thestructure of the scan engine. Besides, it gives an implementation as has been noted. The essay give a detailed anatomy of the key techniques of the e-mail antivirusgateway, especially the virus techniques, it may be of a little value for the researcherand developer in the field.