FreeOTFE – Free Open Source On the Fly Transparent Disk Encryption Program
http://www.freeotfe.org/

FreeOTFE is a free, open source, “on-the-fly” transparent disk encryption program for PCs and PDAs. Using this software, you can create one or more “virtual disks” on your PC/PDA. These disks operate exactly like a normal disk, with the exception that anything written to one of them is transparently, and securely, encrypted before being stored on your computer’s hard drive. Features include: 1) Source code freely available; 2) Easy to use; full wizard included for creating new volumes; 3) Both PC and PDA versions are available; data encrypted on your PC can be read/written on your PDA, and vice versa; 4) No need to install it; making it ideal for use on USB memory drives, etc; 5) Optional support for smartcards and security tokens; 6) It’s powerful: Supporting numerous hash (including SHA-512, RIPEMD-160, Tiger) and encryption algorithms (including AES, Twofish and Serpent) in several modes (CBC, LRW and XTS) – providing a much greater level of flexibility than a number of other (including commercial!) OTFE systems; 7) Encrypted volumes may either be file, partition, or even disk based; and 8) Much more! This has been added to Privacy Resources Subject Tracer™ Information Blog.