TrueCrypt 5.0A

TrueCrypt is an open-source encryption software that allows users to create virtual encrypted disks and encrypt entire partitions or storage devices. It supports a variety of encryption algorithms, including AES, Serpent, and Twofish, and can be used on multiple operating systems, including Windows, Linux, and macOS. The software also includes features such as hidden volumes, which allow users to create two separate encrypted volumes within one disk or partition, and the ability to encrypt the entire operating system partition, providing an additional layer of security.