Multilevel Digital Signature System for Enterprise (MDSS)
Introduce

At some organization, document multilevel signing is a necessary work everyday. Now, most organizations still sign documents by hand. Though we have electronic document, we cannot but printing, copying and looking for people for his signature and then keeping the paper file in archives. What is more, many electronic file can't be printed perfectly.
Often, we must sign file though we are in different cities. We can send file by email but can't add signature. If we post paper document and signing it before sending back, it is very inefficient.
Where is the advantage of electronic media if we do sign process by traditional way.
Like a written signature, the purpose of a digital signature is to guarantee that the individual signing the message really is who he or she claims to be. Also, it guarantee the message had not been changed from his or her signing action.
If facile and efficient digital signing can be done, we can achieve more efficiency and all advantages of electronic media again.

MDSS is a outstanding solution for electronic file signing, It is suitable for all kinds of organizations. You can know more about MDSS by visiting our web site.

To using MDSS server program and client program, intranet environment is required. Yet, after registration, a user can also do signing and view signed file without intranet.

System Requirements for client and server program
Windows 2000 Professional/Server(SP4+),Windows XP Professional/Home (SP2),Windows Server 2003, Windows Vista

Maintenance Requirements
A MDSS system administrator should be appointed in your organization. His or her main task is user accounts management and data backup. It is not a heavy task, so you need only a part-timer.
Generally, it isn't necessary to appoint a professional computer technician as the administrator. But if you use MS SQL Server, which is not the default choice, to store MDSS system data. A professional computer technician who is familiar with MS SQL Server is needed.

Main Functions

1. MDSS can sign electronic file in any format;
2. After installing MDSS on intranet, and some necessary operations, users can use MDSS to sing electronic file and verify signatures anywhere in the world.
   
3. compelling compulsory essential exigent imperative important needed obligatory required urgent
4. the customer
5. A file can be signed by many persons and later signer can make his or her signature depend on one or more existing signatures;
6. Additional information such as advise, role and department of the signer, sign date etc. can be involved in signature file. This information is also signed.
7. User can use personal signature graphics.

1. By signature verification, we can know:
• Signer’s name, his or her advise and role.
• Whether the original file and additional information have been changed after signing.
2. File administrator can solidify signature file. This can be used as file archiving.
3. User is permitted to apply many signing keys.
4. Support parallel sign process

When a file must be signed by many peoples, the common sign process is ordinal. However, MDSS allows parallel sign process which is more efficient then ordinal process

MDSS Security

1. SHA messages digest algorithm, RSA dissymmetric key encryption algorithm, Blowfish symmetric key encryption algorithm and other algorithms are used in MDSS . These algorithms are reliable and widely adopted.
2. Dynamic transport encryption are used which ensure the security of transported information.
3. An identification method similar with Kerberos is designed and realized. It supports intrusion monitoring and shielding in application layer.
4. A method which is more reliable than time-stamp is used to prevent replay attacks.
5. MDSS inspects and records all validated signatures. User can check signing records.
6. MDSS records wrong login (existent user name but wrong password). User can check wrong login records using his or her user name. When doubtful record is find, user can take action in time.
7. When print signatures,  random background grain is used in anti-counterfeit printing which makes it difficult to forge or change a printed signature page.