Secure Files Management System in Intranet

Documents and source codes is the core assets in an enterprise. For preventing the dates to be leaked, some enterprises don't allow them to be transmitted or copied. This results in the rigid workflows. Others just adopt the software. This results in the compromise of the files. In this paper, a system is proposed based on access control, encryption and digital watermark. The system can prevent the leakage of files in intranets, and avoid rigid workflows. In the system, two digital watermarks are embedded in a file. The first watermark prevents the file to be tampered. The second watermark denotes the security level of the file. Only the file that is embedded second watermark can be transmitted or copied. The file which first watermark is embedded in, is encrypted before the second watermark is embedded. Thus only the authorized users can decrypt the file and read it.