"In order to complicate listening to radiation from the [screen], THL blinks encrypted messages in morse code on the keyboard LEDs."

Leon drew my attention to this. The first paragraph on the project page explains it all, really:

It started as a secure, single floppy, bootable Linux distribution for storing PGP keys and then encrypting, signing and wiping files. At some point it became an exercise in over-engineering.

(The quote that is this article's title comes from the README.)