Electronic stamp system based on password layered system

The invention relates to an electric seal system based on a password layering system; the system can be used for carrying out the functional operations like sealing, validating, encrypting, decrypting, and the like, on an electric document. The system integrals three key technologies which include digital singing technology, digital watermark technology and biometric recognition technology; a complex arithmetic which supports digital signing, digital watermark and biometric recognition is comprehensively used.