A new cartoon introduction to cryptography doesn't gloss over the details, but it all seems so much easier in black-and-white.
A Microsofty going by the name Planky has generously posted a cartoon video explaining the ideas that are central to modern cryptography. It covers encryption, certificates, public/private key and digital signatures and all in a way that you can understand.
If you don't believe me just watch, but be warned it is 30 minutes long and you will probably not want to get up and do anything else until it is finished:
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