Application of digital signature on official document transmission

Under the trend of official business work on Internet,the security of official document transmission,Internet authentication and so on is drawing more and more attentions.The DR of digital signature provides safe and efficient measures for official business on Internet.How to use MD5 and RSA computing methods to realize digital signature in official document transmission is introduced.The modifying and replacing are prevented by other people during the transmission of official document to ensure the validity and authen-ticity ofdocuments.By taking advantage of advanced response protocolbetween sender and receiver,the shortage of pure digital signature is avoided.It is suitable for current B/S frame OA products.The paper not only provides safe and reliable computing methods MD5 and RSA but also point out the shortage of separate usage.