T r u e C r y p t Free open-source disk encryption software for Windows 7/Vista/XP, Mac OS X, and Linux. The latest release now covers pretty much every operating system there’s no reason for not having it. Especially seeing as all user accounts can be bypassed 99% of the time in less than a few minutes, put any sensitive data in truecrypt and the only thing you have to worry about is forgetting the password… Main Features: Creates a virtual encrypted disk within a file and mounts it as a real disk. Encrypts an entire partition or storage device such as USB flash drive or hard drive. Encrypts a partition or drive where Windows is installed (pre-boot authentication). Encryption is automatic, real-time (on-the-fly) and transparent. Parallelization and pipelining allow data to be read and written as fast as if the drive was not encrypted. Encryption can be hardware-accelerated on modern processors. Provides plausible deniability, in case an adversary forces you to reveal the password: Hidden volume (steganography) and hidden operating system. More information about the features of TrueCrypt may be found in the documentation. via TrueCrypt – Free Open-Source On-The-Fly Disk Encryption Software for Windows 7/Vista/XP, Mac OS X and Linux.