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Authentication is very important in the security and technology of electronic accounting system. It is the first protector and the portal of network system. The purpose of authentication is verifying the identity of two communication parts and prevents the illegal users steal the data of accounting system. In the secure network communications, the parts of communications only can achieve access to different users must certify their identification first. The one-time password technology is the important technological measure. This technique contains high safety, less computation and it also provides the function of mutual authentication. It can also resist the replay attack, imitate attack and analysis of violence. So it can strengthen the safety of electronic accounting system.