Pki / Ca-based Electronic Tax System

Along with the development of information technology(IT), especially electronic business, the safety of information transmitting via Network is becoming the toughest matter about which is most concerned. Research of PKI/CA is a very popular subject in the field in electronic business . Gradual perfect of cryptogram theory provides strong support to the "birth" of security system. Under this background, a thought of security system based on PKI/CA is brought up in this essay to meet the requirement of information safety. Considering the high-speed circulation of current information, a encrypt method based on PKI/CA was proposed to solve this problem.In the field of electronic business, Digital Signature based on PKI/CA is the most important technologies to deal with secure transmission of information. But unfortunately, there is not much achieved. Research on ID Authentication and Digital Signature suitable for PKI/CA system was imporntant.This paper aims at the design of PKI/CA system. According to the feature of RSA crypto system , the fast algorithms including multiply was designed. Optimization of the base algorithm was done. Main research and outcome of this essay was described briefly as follows.Security system basic knowledge was described and explained sysmetically, its function and characteristics was analyzed. It was pointed out that cryptogram technology was an important solution to current security problem. The model of Security system was developed , and each part of the model was studied and analyzed. A conclusion was drawn that the most important thing in designing PKI/CA system was the establishment of cryptogram protocol and the selection of cryptogram method.Analysis and research was done on the current main stream crypto system, which includes public-key crypto system and private-key crypto system, and a comparison was made too. Research and comparison on RSA that is the representative public-key crypto system and DES that is the representative private-key crypto system were done, and then 3DES was brought up. With the analysis on RSA security, hybrid crypto system based on RSA and DES was constructed through combining both traits of the public-key crypto system and the private-key crypto system.