Research On Digital Signatures Based On PKI

With the rapid development of modern information technology,the importance of information security is emerging. As one of the core technology of information security,digital signatures play an important part in military affairs, telecommunication and e-commerce.First of all,the dissertation introduces basic concepts,principles and the domestic and abroad development state in this research area.Then,it studies mathematical models of the classic algorithms, and introduces MD5,DES,RSA,ECC...etc in detail.And then,it compares their advantages and their disadvantages.On this basis,the dissertation studies the digital signature technique based on PKI,proposes a PKI solution which is suitable to enterprise.And then,we design and implement a visual digital signature prototype system. This system uses the RSA and MD5. The system integrates the digital signature technique into the office software.Users can sign their documents like word documents,excel documents,visio documents and other types of documents in office software,which makes the system more convenient and more intuitive. And also,this system embeds signature into document by using the XML technique and AcitiveX technique,which makes signature safer and more reliably.Finally,prototype system was tested,experimental results demonstrate the correctness and feasibility of the system.