Abstract:

Information security has become a heated topic in the field of computer science. In order to facilitate the users and managers of computer to protect their data better, this paper proposed a confidential mechanism for digital files. A digital file confidential cabinet based on symmetric encryption algorithm was designed to protect the local files from illegal acquisition by unauthorized persons. The digital file confidential cabinet provided a more secure protection mechanism for the users. The user could read and write a file transparently and encrypt this file at the same time. To protect sensitive files from being maliciously copied and transferred, the files located in the digital file confidential cabinet can only be used in the local computer while errors will occur in the remote use. The digital file confidential cabinet saves the safety management of the users on the file, simplifies the process of encryption software, and provides good performance of anti-crack. The digital file confidential cabinet provides an independent safety which is not rely on the third parties, but also plays a positive role in promoting its security in the process of the development of the public security intranet.

Key words: file off-site protection, digital file confidential cabinet, data leakage, symmetric encryption, DES algorithm reprogramming