Application of Cryptography and Digital Water-Mark in Electronic Cachet
Xie Wei-xin · Microcomputer Development · 2004
To improve the safety of the electronic cachet and the electronic documents,design a schema of three layer watermarking with the combination of cryptology and digital water-mark. The presentation layer shows the picture of the electronic cachet.The half transparent crisped watermark can protect from being copied and tampered. The last layer have a strong invisible watermark for the uniqueness.Use the smart card to store the secret key, and save the cachet image into the cachet server to improve the system safety. In the end,introduced how to make the cachet and the design of the system.