Abstract:

In view of the security issues of electronic documents in the OA system,the integrity and authenticity of documents are analyzed,which uses the Hash function and digital signature.A new scheme is presented that the signature of documents is embedded as watermark into the image of seal.On the basis of the encrypted interface of the COM technology and Microsoft CryptoAPI,a new plan of digital seal based on digital watermark technology is presented.Research shows that this plan can be applied to traditional and electronic documents and ensure their integrity and authenticity.

Key words: OA;digital signature;digital watermark;digital seal;COM technology