除密码保护外，如何改善MS Access MDB的保护？

i have a mdb access which is password protected but that can be easily cracked by a free tool found in google within like 1second. Besides paying for some expensive tools, is there a good way in how to protect a ms access databse file? I'm thinking of encrypting it then via a dll to decrypt it, get some data, and pass it to a third party app, then when the connection is close, encrypt the file again.i have a mdb access which is password protected