Screaming Penguin

developerWorks has a great article and code example of using a simple checksum to keep an eye on your filesystem. This is simple yet tremendously useful in terms of security. It will alert you when anything changes, even if the name AND size are the same (which some clever trojans can do.) Very good stuff (and yes, mentioned here once before, worth another mention trust me.)   usign checksums to keep an eye on the filesystem: developerWorks