integrit is a more simple alternative to file integrity verification programs like tripwire and aide. It helps you determine whether an intruder has modified a computer system.

Without a system like integrit, a sysadmin can’t know whether the tools he/she uses to investigate a potential break in are trojan horses or not. A system like integrit works by creating a database that is a snapshot of the most essential parts of your computer system. You put the database somewhere safe, and then later you can use it to make sure that no one has made any illicit modifications to the computer system. In the case of a break in, you know exactly which files have been modified, added, or removed. integrit is a robust, stable piece of software designed for professional use.

For more information about integrit chek out: http://integrit.sourceforge.net/