TrustKey is a project to make secure PDA software that links to
your PC. The first implementation of the code is written in yabasic
under FreeBSD. The code uses One Time Pad- and Spread Spectrum-style
technologies to make very strong encryption.
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.