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DESPass
For DES encrypting password files suitable for uploading to web servers.
Enigma Simulator
Fully functional, accurate simulator of the infamous German Enigma encryption machine invented in 1918.
GnuPG
Port of GnuPG (Privacy Guard) by Steffan Bellon.
PGP and Security Utilities
A collection of security utilities for RISC OS. Includes front ends for PGP, allowing PGP to be used for e-mail and files.
PhotoSteg
Will disguise any type of data within pre-drawn RISC OS 24- or 32-bit sprites.