Can you give me some suggestions

My purpose is to design file monitor tool
Now I can get the hash value for every file and put the filename and hash value into MS access database.
If the content of file modifyed, the hash value have been changed. So I can know whether the file have been modified by md5 value.
Considering security, whether I should encrypt the hash value

THANKS silk.m
yes, it's running locally to prevent local users from
modying files.
Can you descibe the system-wide hooks ,etc more
detailly. Well, on windows you can redirect calls to certain API's. Say, for opening a file.
If me (joe hacker) wants to modify filea.txt I can write a hook that looks for a call to open this file, and instead of giving you that file back, you will get backup-filea.txtSo to you, these files will be the same (cause I just copied it and renamed it), but I have silently modified the real file and am doing naughty things with it :)
Basically - you need to lockdown the computer, and really try hard to prevent users from installing things on it.
Also, you should definately first determine who your attacker is (i.e: threat model) because if it's just the secretary of the company there is less risk (though still some risk).
Good luck.

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