GNU/Linux Desktop Survival Guide by Graham Williams
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TrueCrypt Encryption

20191225 It is good practise to at least ensure all of your local disks (e.g., USB disk drives) are encrypted at rest. If your USB drive is physically stolen then the thieves will be quite challenged to access your data. The TrueCrypt application, even though it is no longer under development since 2014 (version 7.1a), provides a solid platform for securing data on disk.

TrueCrypt will encrypt a drive and also supports the creation of a hidden drive which lives stealthily within an encrypted drive and supports plausible deniability. As the documentation says, if you are being extorted in order to provide access to your data, you can plausibly decrypt the outer volume whilst retaining the protection of the hidden volume. There is no evidence from the disk itself of the existence of the hidden volume.

TrueCrypt can be installed from a Ubuntu PPA as truecrypt:

$ wajig addrepo ppa:stefansundin/truecrypt
$ wajig update
$ wajig install truecrypt
$ truecrypt

Plug in the USB disk drive that is to be used for the encrypted file system. From the command line enter the command truecrypt or else from the application menus. On the TrueCrypt GUI click the Create Volume button to bring up another window. Choose to Create a volume within a partition/drive. Next choose the Hidden TruCrypt volume option. Next identify the Volume Location, which might be the device /dev/sdb1. Note that all data on the device will be lost following a device format. The administrator password will be requested so that the formatting can begin.

For the Outer Volume Encryption Options stay with the defaults, namely AES as the Encryption Algorithm and RIPEMD-160 as the Hash Algorithm. Provide an Outer Volume Password. Then with the Outer Volume Format move the mouse around randomly within the window to create entropy for the encryption keys. Then click Format and the disk will be formatted appropriately. This can take multiple hours for larger disk drives.

More information on TrueCrypt is available from https://www.grc.com/misc/truecrypt/truecrypt.htm.