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Sign electronic file in any format. A file can be signed by many persons
Later signer can make his signature depend on one or more existing signatures
Signer's advises can be involved in the signature
Two signing models - Web Key Sign and Local Key Sign
At 'net anonym' or 'net login' model, verificat, signature file automatically
Solidify signature file for archiving
By signature verification, we can know:
[a] Signer and his or her advise and role
[b] Whether the file and additional information have been changed after signing
RSA key (1024 bits) ensures signature safety
Dynamic transport encryption protects transported information.
Login system supports intrusion monitoring and shielding
Records all valid signatures for user auditing
Records all wrong logins (existent username but wrong password) for user auditing
Anti-counterfeit signature page printing
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