Stealth (SSH-based Trust Enhancement Acquired through a Locally Trusted Host) is a file integrity scanner. It differs from a program like Tripwire in that it does not require the use of read-only media or modifiable logs. It leaves (almost) no trace on the computer being checked. It is very difficult for intruders to detect or evade, and cannot be modified by intruders. It can be used to perform integrity checks on many computers without a heavy maintenance burden. It can be used without being installed on the target computer.
mach allows you to set up clean roots from scratch for any distribution or distribution variation supported. Currently, this is limited to RPM-based distributions. This clean build root can be used for making clean packages, running jailed services, testing builds, or making disk images of clean roots.