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With the rapid development of information technology , information security problem has become increasingly prominent . Digital signature as one of the core technologies of information security can provide authentication , integrity and non-repudiation , and plays an important role in the fields of military , communications , e-commerce and e-government . This paper first introduces the basic concepts of cryptography and digital signatures , to the basic issues of principle as well as the current domestic and international research status , given the theoretical model of digital signature , digital signature algorithm proposed to provide a theoretical basis for the implementation and testing ; research mathematical model of the classic digital signature algorithm , MD5, DES, RSA, ECC algorithm is described in detail , and summarizes the strengths and weaknesses of the various algorithms . On this basis , in-depth research , a PKI - based digital signature scheme , the design and development of a digital signature with visual function prototype system based on public key infrastructure PKI digital signature technology . The system uses RSA and MD5 algorithm , integrated digital signature to the office office software , visual signatures on documents such as word, excel, visio , the signature is more convenient and intuitive ; document using XML technology and AcitiveX technology embedded signature , the signature is more secure and reliable . Finally, experimental test of the prototype system , the experimental results demonstrate the feasibility and correctness of the system .
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