Tripwire is a very popular system integrity checker, a utility that compares properties of designated files and directories against information stored in a previously generated database. Any changes to these files are flagged and logged, including those that were added or deleted, with optional email and pager reporting. Support files (databases, reports, etc.) are cryptographically signed.
e09a7bdca9302e704cc62067399e0b584488f825b0e58c82ad6d54cd2e899fad