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Links and catalogues of freely licensed and other freely available content on the web
Ways of squeezing information from the web
A generic and powerful spider for searching web documents and local files
The public-key system PGP in principle
An introduction to casual use of PGP/GnuPG with webmail services or mailers without PGP integration
How S/MIME message descryption with a smart card works in detail
A TCP relay implementing a time-honoured method against man-in-the-middle attacks
Collected technical documentation and tutorials on the open but underdocumented mapping data project
Observe network protocols in transit for education and troubleshooting