An add-on for the class of today.
CryptoParty (Crypto-Party) is a grassroots global endeavour to introduce the basics of practical cryptography such as the Tor anonymity network, key signing parties, TrueCrypt, and virtual private networks to the general public. (wikipedia)

Here is the handbook for the courageous:
http://key.cryptoparty.is/files/cryptoparty-handbook-2013-08-21/cryptoparty-handbook-2013-08-21.pdf

There is one in Amsterdam next week:
https://decorrespondent.nl/212/laat-je-computer-beveiligen-op-mijn-correspondent-avond/5976916-ad3a5a96