Tripwire is an integrity checking product, triggering alarms when important files (e.g. system or configuration files) are modified.
This is a tool that is not likely to be used by hackers, other than for studying its workings in order to circumvent it.
Other programs are password-cracking programs and are likely to be used by security administrators as well as by hackers. More info regarding Tripwire available on the Tripwire, Inc. Web Site. NOTE: The biggest competitor to the commercial version of Tripwire is the freeware version of Tripwire. You can get the Open Source version of Tripwire at the following URL: http://sourceforge.net/projects/tripwire/