TLDR: Its a relatively easy way to create encrypted digital virtual drives. --------------------------------------------- Details: Truecrypt creates a .txt f

TLDR: Its a relatively easy way to create encrypted digital virtual drives. --------------------------------------------- Details: Truecrypt creates a .txt file - via a GUI - which is complete gibberish... until you unlock it. It is then a mounted drive. At time of creation of the Truecrypt volume you: * set the drive size - it can be very small (ex: 1mb) to very large (many GB iirc) * set the access credentials. This can be a password, or it can be a password and key-file - that is a file you must pass in addition to the password. The file can be any kind of file. A jpg, an MS Word doc file, a OS iso, a .pem or .ppk... it doesn't matter. I think the hash generated by the file is essentially a second passphrase. Change the contents of the file and you change the hash... it doesn't work. Pick your favorite picture among the tens of thousands you have backed up several places online... and it's much less obvious than the one or two .ppk files you have tucked away in you lastpass account. * you can have a "hidden volume." Say for example somebody drugs you and hits you over the head with a wrench to get your Truecrypt volume access credentials. You give them the credentials, they unlock and mount the drive... and inside is your grandma's banana bread recipe... not your bitcoin wallet details. You gave them the passphrase to a "dummy volume." If you follow the instructions correctly regarding this you can have the actually valuable information hidden within the Truecrypt volume. There's no indication that any particular volume has a hidden volume in it or not. So there's a kind "plausible deniability" about what's there.