PCWorld: Keep Data Safe, Use Free Cryptainer LE
Cryptainer is not too difficult to set up, easy to use and not much slower than moving files to and from an unencrypted drive.
“Cryptainer LE encrypts your data and stores it in a large file that, once you’ve provided a password, mounts as a virtual drive. You may use the virtual drive as just as you would any other drive under Windows: drag and drop, copy, delete, move, and so on. Cryptainer LE also provides a program interface to configure the program and enable the drives.
The first time you run Cryptainer LE, you set the location for the encrypted file, provide an eight-character (or greater) password, select between Blowfish 448-bit or AES 256-bit encryption, set the volume drive letter, and you’re good to go. You can create additional encrypted files/volumes, but Cryptainer LE keeps track of the default volume’s location only. There is no default file extension, so I recommend that you create a folder for your additional volumes and name it in a suitably memorable fashion.”