Research Of Realizing Electronic Seal Technology In OA System

With the repaid development of the electronic information technology and nowadays the digital network, the information network has spread many fields of the society, and the rapid development of the computer network has made the electronic commerce a new mode governmental activities. In the OA system, electronic communication has widely been used in the communication of the governmental and enterprise documents, the storage of the documents and services of the governmental department, which has caused the paperless work of the governments and enterprises bring schedule. The questions need to be solved are how to safeguard the validity, uniqueness, the tractability illegal duplication-proof and illegal revision-proof of the official documents. Based on the above-mentioned questions, the article has proposed an electronic seal system, which has been used to solve a sealer of safety problems such as illegal revision-proof, illegal duplication-proof etc. The system is based on digital watermark, digital signature and Microsoft the word re-development technologies, and it has effectively combined PKI technology and USB KEY technology, molder to prevent the seal bring tampered as well as the illegal duplication. Thus make sure the archives and contract is the only and legal one.It's main idea is: Inserts through the documents owner's only symbol information and the digital signature information as the watermark to the seal picture, thus has realized the electronic seal has the only symbol and the forgery-proof, as well as the electronic seal of the archives and contracts have a series of functions such as forgery-proof and revision-proof after being stamped. Through the seal picture preservation in USB Key, takes care of by user, as well as strengthens the application and the distribution management of the seal through the PKI technology. Finally realizes the electronic archives and contract will be the only and legal one in the OA system.