TrueCrypt is an awesome open-source software program for on the fly file encryption. Here’s some of the 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: LRW.
The software runs on Windows Vista/XP/2000 and Linux. It allows you to create a mountable volume on your computer in order to store files that are fully and securely encrypted. Excellent program and free. Check it out.