Research Of Network Grading Signature Verification System Based On C/S Structure

As an important reformation of examination domain in china, network grading has been taken broad notice by the society, though it also exist some problems for us to solve. At present, network grading management is based on password management mode, the existing status will be unable to identify or the status cheat will be unable to trace if the key is lost. Profit from the development of signature verification technology which makes the promotion of electronic signature possibly, remarking people can provides the real evidence for error tracing.Under the research and analysis of the On-line handwriting signature verification, this paper, which starts with development background and necessity of the network grading system, applies the object-oriented technology to design and realize the system base on Visual C++ 6.0 platform and SQL Sever 2005 database. At the beginning of this paper, a reasonable subsystem model is established by researching network grading of signature verification, then puts forward the solution based on 3-tier C/S structure and designs the framework of the system in view of the insufficiency of efficiency, security, reliability, stability about traditional based on 2-tier C/S structure.The sever's design of signature verification system is analyzed, including application sever and database sever. To the database sever, the design of datasheets and the trigger are introduced, the composition of signature database including the library of real signature and forged signature is discussed, and a new solution to deal with the renewal of the signature sample library is proposed. Considered the security of the system, some sensitive fields in database are encrypted. To the application sever, a COM module of ATL is developed to let application sever realize the operations of connection, inquiry, insertion, deletion with database. Furthermore, some interfaces are designed and the interface functions are realized.Through the theory of computer multilayer structure, COM/DCOM technology, data module technology, and other program development technology, this paper has completed the client's design of signature verification system, including communication mechanism between clients and sever. The signature verification system is composed of system management module, signature registration module, signature verification module, images hidden module and something else. In the system management module, the sub-modules such as the rights management module, log management module, system settings module are designed. At the end of this paper, some typical modules have been validated, which show well performance.Benefit from signature verification technology, the safety and authenticity of network grading are guaranteed, the sense of responsibility to remarking people is increased and the quality of the network grading is improved.