Access control method using token having security attributes in computer system

A computer-readable recording medium for storing a program therein, the program comprising:

• a first function for providing a token having security attributes, such as an encryption attribute, a modification attribute, an execution attribute, and a provision attribute, to a user permitted to access an arbitrary file and a corresponding file;
• a second function for decoding a corresponding file on condition that the user has the same token as the file and providing the user with the decoded file in the case where a user attempts to read a file having an encryption attribute, or providing a user process with an enciphered file state without decoding the file in the case where a user does not have the same token as the file;
• a third function for, in case of a write request of a user on a file having a modification attribute, determining an access denial on condition that a user does not have the same token as the file, determining access permission on condition that a user has the same token as the file, enciphering and storing the file on condition that a corresponding file has an encryption attribute, and directly storing the file as it is on condition that a corresponding file has no encryption attribute;
• a fourth function for, in case of an execution request of a file having an execution attribute, determining an access denial of a user who does not have the same token as the file, and executing a corresponding file for a user who has the same token as the file;
• and
• a fifth function for, in case of an execution request of a file having a provision attribute, removing all tokens assigned to a user by the provision attribute, providing the user with a corresponding token, and executing a corresponding file.