“Open Source Tripwire® software is a security and data integrity tool useful for monitoring and alerting on specific file change(s) on a range of systems. The project is based on code originally contributed by Tripwire, Inc. in 2000.”
A crude yet effective intrusion detection system such as Tripwire can alert systems administrators to possible intrusion attempts by periodically verifying the integrity of a server’s file systems. Systems intruders will often use trojan binaries for login, su, ps, and ls, etc. to cover their tracks and keep a low profile on the system. Under normal circumstances even astute systems administrators may not observe the intrusion because the trojan binaries mimic the system binaries so well.
This tool is a MUST have for all security conscious Linux System administrators. For step by step instructions on how to implement this on your server, you can [read entire article here].
Thanks to Linux Security, The central voice for Linux and Open Source security news for this very helpful information. Additionally, Yunliang Yu from Duke University has written a HOWTO on implementing this across an entire network. You can read his article here.
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It’s a real plsuaere to find someone who can think like that