FILE SECURITY SYSTEM USING SECURITY LEVEL AND METHOD FOR MANAGING ENCRYPTION KEY

摘要

PURPOSE: A file security system using a security level and a method for managing an encryption key are provided to encrypt or decrypt a file having the security level by using the encryption key of each security level, and to offer the file to a user, or save the file in a disk. CONSTITUTION: The disk(130) stores the encryption key matched with the security level set by an access control module(120), a key file storing the encryption key, and the file encrypted by the encryption key. A kernel memory(140) stacks the encryption key stored in the disk(130) according to the driving of the encryption file system(110). The encryption file system(110) draws out the encryption key matched with the security level of the file to read or stored by the user from the kernel memory(140), and transmits the file decrypted or encrypted by the encryption key to the user, or stores the file in the disk.