TrueCrypt is best freeware program for encryption. With TrueCrypt you can encrypt for important and private files with 11 algorithms
.You can store your encrypted data in files (containers) or partitions (devices). TrueCrypt works hard to offer powerful data protection, recommending complex passwords, explaining the benefits of hidden volumes, and erasing telltale signs of the encryption process, including mouse movements and keystrokes.
TrueCrypt is a must have tool for encryption.
File Size :- 3 MB
License :- Freeware
Homepage :- http://www.truecrypt.org