- The International PGP Home Page
- The GNU Privacy Guard - GnuPG.org
- MIT PGP Distribution Page
- Anonymity and privacy on the Internet
- The PGP Attack FAQ
- TrueCrypt - Free Open-Source On-The-Fly Disk Encryption Software for Windows Vista/XP/2000 and Linux - TrueCrypt is free open-source disk encryption software for Windows and Linux.
- Rubberhose cryptographically deniable transparent disk encryption system - Free cryptographically-secure HIDDEN filesystem for Linux
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