FreeOTFE - Open Source Disk Encryption Solution

Key Features

• FreeOTFE4PDA is a free, open source, \"on-the-fly\" (OTFE) transparent disk encryption program.Using this software, you can create one or more \"virtual disks\" on your PC - anything written to which will be automatically, and securely, encrypted before being stored.Features include:- 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 doesn\\'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.- 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).- Plus more...!

Technical Specifications

• **Publisher:** Freeotfe.org
• **License:** Freeware
• **Operating System:** Windows 7, Windows 8, Windows 10, Windows 11
• **Last Updated:** October 15, 2025
• **Category:** Utilities / Encryption