Wondjina is basic proof of concept Perl code to show that binary files can be tunneled in a stealthy manner by using the HTTP/1.1 "entity tag" as a covert channel.
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Security Hardening of Windows 2000 and NT Server Machines - Contains a roundup of good security practices, hardening, ways that windows-boxes are penetrated, and a roundup of some useful tools. Written in 2001.
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OS/2 Packet Filtering - OS/2 machines are good for firewalls and the packet filtering code is not documented.
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