A Watermark Algorithm Applied for Electronic Seal Service
Fei Tian-hao · Aeronautical Computing Technique · 2008
Signature image is widely applied in actual business activities.In order to avoid forgery,cipher signature and digital water-mark are integrated into the electronic seal.And it can prevent secret documents from being illegally modified while achieve the identity authentication and non-repudiation.To secure the electronic seal in analog form,we developed a new watermark algorithm in DCT domain,which is strongly robust in printing or scanning process,and also is of high transparency.