I have recently discovered the existence of the Project Toth, telematic network Criptored. He publish minivideos with an approximate duration of three minutes, in which we can learn many basic notions about cryptography.
Here you can see the first three pills, I have added to the video library, and I will be adding on while they are being published.
Pill 1 – Computer security or information security?
Pill 2 – What is Cryptography?
Pill 3 – Since when does the Cryptography?