Encrypted communications: how do they work?

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Music in this video: Intro music: edited version of "Free Jingle | Intro - Fremantle" by Lino Rise Media. The work by Lino Rise Media is licensed under a Creative Commons Attribution 3.0 Unported License. Based on a work at www.linorise.com. ... https://www.youtube.com/watch?v=NDlv0pN1niU