Useful tools

• TCP Wrapper http://www.cert.org/ftp/tools/tcp_wrappers/

• Tripwire http://www.cert.org/ftp/tools/tripwire/

• Crack http://www.cert.org/ftp/tools/crack/

• SSH (Secure Shell) ftp://ftp.arnes.si/security/ssh/

• Pretty Good Privacy http://www.pgpi.com/

• Argus http://www.ciac.org/ciac/ToolsUnixNetMon.html

• SATAN http://www.ciac.org/ciac/ToolsUnixNetSec.html

• ISS http://www.iss.net/

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