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Tool to check for trojans, CERT advisories, and system file permission correctness.
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Practical measures for critical infrastructure protection, intrusion prevention and threat assessment.
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Make your system seem to have network security bugs, and log attack attempts.
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Fakes trojan servers (Back Orifice, NetBus) and logs every attempt from client.
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Examines source code looking for security weaknesses.
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Free software (GNU license) from Bell Labs for protecting internet servers from buffer overflow attacks, one of the most commonly exploited security vulnerabilities.
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A tool for file integrity checking that optionally can be used as a client/server application for centralized monitoring of networked hosts.
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Tripwire, file integrity assessment tool for UNIX.
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Various computer security related papers.