TrueCrypt is one of the most popular encryption tools which is designed for on-the-fly encryption even though it is going on for several years without being updated. This tool can be used to encrypt the entire storage device, a part of the storage device or to create a virtual encrypted disk in a file.
TrueCrypt enables the security professionals to encrypt layered content to use two different types of access control. This is one of the reasons that TrueCrypt remains to be popular through the necessary updates that have not been given for many years.
Download Link- https://github.com/FreeApophis/TrueCrypt