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  Selected File: TrueCrypt Encryption Software by TrueCrypt Foundation
available versions :
TrueCrypt v6.3a

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Free open-source disk encryption for Windows Vista/XP/Vista/...

Main Features:

    * It can create a virtual encrypted disk within a file and mount it as a real disk.

    * It can encrypt an entire hard disk partition or a device, such as USB memory stick, floppy disk, etc.

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

      1) Hidden volume (more information may be found here).

      2) No TrueCrypt volume can be identified (TrueCrypt volumes cannot be distinguished from random data).

    * Encryption algorithms: AES-256, Blowfish (448-bit key), CAST5, Serpent (256-bit key), Triple DES, and Twofish (256-bit key). Supports cascading (e.g., AES-Twofish-Serpent).

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http://truecrypt.sourceforge.net/