TrueCrypt is a popular and free open-source disk encryption software for Windows Vista/XP , Mac OS X, and Linux. Version 5.0 was just released.

Main Features:

Creates a virtual encrypted disk within a file and mounts it as a real disk.

Encrypts an entire hard disk partition or a storage device such as USB flash drive.

Encryption is automatic, real-time (on-the-fly) and transparent.

Provides two levels of plausible deniability, in case an adversary forces you to reveal the password:

1. Hidden volume (steganography – more information may be found here).
2. No TrueCrypt volume can be identified (volumes cannot be distinguished from random data).

Encryption algorithms: AES-256, Serpent, and Twofish. Mode of operation: XTS.Download TrueCrypt 5.0

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