Abstract: Based on Chinese remainder theorem, this paper proposes an authentication\|doubled access control scheme for information protection system .The main contribution of this method is that by a simple modulo operation on the keys and locks of the user and the file, the access right of a user to the file is derived, and the action of inserting, deleting a user/file, or updating the access right of a user to a file can be done by modifying only one key and one clock, and the authenticating mechanism is strengthened.