FreeOTFE is a free, open source, "on-the-fly" transparent disk encryption program for PCs and PDAs (Windows Mobile 2003/2005).Using this software, you can create one or more "virtual disks" on your PC/PDA - anything written to these disks is transparently, and securely, encrypted before being stored on your computerТ‘s hard drive. Features: • Source code freely available • Easy to use; full wizard included for creating new volumes • Data encrypted on your PC can be read/written on your PDA, and vice versa • Powerful: Supports numerous hash/encryption algorithms, and provides a greater level of flexibility than a number of other (including commercial!) OTFE systems • Hash algorithms include: MD5, SHA-512, RIPEMD-160, Tiger and many more • Cyphers include AES (256 bit), Twofish (256 bit), Blowfish (448 bit), Serpent (256 bit) and many more • "Portable mode" included; FreeOTFE doesnТ‘t need to be installed before it can be used - making it ideal for carrying your data securely on USB drives! • Operates under both PC (MS Windows 2000/XP) and PDA (Windows Mobile 2003/2005) platforms • Linux compatibility (Cryptoloop "losetup", dm-crypt and LUKS supported) • "Hidden" volumes may be concealed within other FreeOTFE volumes, providing "plausible deniability" • FreeOTFE volumes have no "signature" to allow them to be identified as such • Encrypted volumes can be either file or partition based. • Modular design allowing 3rd party drivers to be created, incorporating new hash/cypher algorithms • Decryption software available to improve transparency, and allow even the most junior software engineer to prove data is being encrypted correctly • Supports password salting (up to 512 bits), reducing the risks presented by dictionary attacks. • Allows users to backup and restore the critical areas of volume files. • Keyfile support included; store volumes and their associated metadata separately. • Uses per-sector IVs, including support for ESSIV • Volume file timestamps and attributes are reset after dismounting, increasing "plausible deniability" • Supports volumes files up to 2^63 bytes (8388608 TB) • Naturally, fully supported by SecureTrayUtil. What's New in version 4.00: • Added support for 64 bit versions of MS Windows • Added support for PKCS#11 (Cryptoki) security tokens/smartcards • Significantly improved partition selection system • Further commandline options • Various other enhancements! Download the PDA version and the source code at the developerТ‘s download page.