FreeOTFE

Source: Wikipedia, the free encyclopedia.
FreeOTFE
Developer(s)Sarah Dean
Stable release
5.21 / 7 February 2010; 14 years ago (2010-02-07)
Written in
Delphi (GUI)
Operating systemMicrosoft Windows and Windows Mobile
Available inCroatian, Czech, English, French, German, Greek, Italian, Japanese, Russian and Spanish
TypeDisk encryption software
LicenseFree and open-source software that requires attribution[1]
WebsiteFreeOTFE at the Wayback Machine (archived May 31, 2013)
FreeOTFE4PDA

FreeOTFE is a discontinued open source computer program for on-the-fly disk encryption (OTFE). On Microsoft Windows, and Windows Mobile (using FreeOTFE4PDA), it can create a virtual drive within a file or partition, to which anything written is automatically encrypted before being stored on a computer's hard or USB drive. It is similar in function to other disk encryption programs including TrueCrypt and Microsoft's BitLocker.[2]

The author, Sarah Dean, went absent as of 2011. The FreeOTFE website is unreachable as of June 2013 and the domain name is now registered by a

domain squatter. The original program can be downloaded from a mirror at Sourceforge. In June 2014, a fork of the project now named LibreCrypt appeared on GitHub.[3]

Overview

FreeOTFE was initially released by Sarah Dean in 2004, and was the first open source code disk encryption system that provided a modular architecture allowing 3rd parties to implement additional algorithms if needed. Older FreeOTFE licensing required that any modification to the program be placed in the

Open Source definition. Newer program licensing omits this condition. The FreeOTFE license has not been approved by the Open Source Initiative
and is not certified to be labeled with the open-source certification mark.

This software is compatible with Linux encrypted volumes (e.g.

LUKS, cryptoloop, dm-crypt), allowing data encrypted under Linux to be read (and written) freely. It was the first open source transparent disk encryption system to support Windows Vista and PDAs.[4][5][6][7]

Optional

RSA Laboratories
.

FreeOTFE also allows any number of "hidden volumes" to be created, giving plausible deniability and deniable encryption, and also has the option of encrypting full partitions or disks (but not the system partition).[9]

Portable use

FreeOTFE Explorer allows access to encrypted disks, without installing any drivers.

FreeOTFE can be used in "portable" (or "traveller") mode, which allows it to be kept on a USB drive or other portable media, together with its encrypted data, and carried around. This allows it to be used under Microsoft Windows without installation of the complete program to "mount" and access the encrypted data through a virtual disk.

The use of this mode requires installing

device drivers (at least temporarily) to create virtual disks, and as a consequence administrator rights are needed to start this traveller mode. As with most open source software that uses device drivers, the user must enable test signing[10] when running Windows Vista x64 and Windows 7 x64 systems.[11]

Driverless operation

Packaged with FreeOTFE is another program called "FreeOTFE Explorer",[12] which provides a driverless system that allows encrypted disks to be used without administrator rights.

This allows FreeOTFE encrypted data to be used on (for example) public computers found in libraries or computer kiosks (interactive kiosks), where administrator rights are unavailable.

Unlike FreeOTFE, FreeOTFE Explorer does not provide on-the-fly encryption through a virtual drive.

Windows Explorer
like interface.

Algorithms implemented

Due to its architecture, FreeOTFE provides great flexibility to the user with its encryption options.

Ciphers

FreeOTFE implements several ciphers, including:

It includes all National Institute of Standards and Technology (NIST) Advanced Encryption Standard (AES) finalists, and all ciphers can be used with multiple different keylengths.

Cipher modes

FreeOTFE originally offered encryption using

LRW and also the more secure XTS mode, which supersedes LRW in the IEEE P1619
standard for disk encryption.

Hashes

As with its cipher options, FreeOTFE offers many different hash algorithms:

See also

References

External links