The Design and Implementation of Tripwire: A File System Integrity Checker (1993)

 

 

Purdue Technical Report CSD-TR-93-071

 

At the heart of most computer systems is a file system. The file system contains user data, executable programs, con guration and authorization information, and (usually) the base executable version of the operating system itself. The ability to monitor file systems for unauthorized or unexpected changes gives system administrators valuable data for protecting and maintaining their systems. However, in environments of many networked heterogeneous platforms with different policies and software, the task of monitoring changes becomes quite daunting. Tripwire is tool that aids UNIX system administrators and users in monitoring a designated set of files and directories for any changes. Used with system files on a regular (e.g., daily) basis, Tripwire can notify system administrators of corrupted or altered files, so corrective actions may be taken in a timely manner. Tripwire may also be used on user or group files or databases to signal changes. This paper describes the design and implementation of the Tripwire tool. It uses interchangeable "signature" routines to identify changes in files, and is highly configurable. Tripwire is no-cost software, available on the Internet, and is currently in use on thousands of machines around the world. [via]
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The Design and Implementation of Tripwire: A File System Integrity Checker

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