Understanding Perfect Secrecy: The One-time Pad

The One-time Pad is perfectly secret.

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0:00 Cryptography seems broken
1:39 Definitions of secrecy
3:36 Perfect secrecy
5:33 The One-time Pad
7:04 Proof: The OTP is perfectly secret
8:20 Limitations
9:23 Applications

Credit:
Deep Back image: By https://www.eff.org/ - https://www.eff.org/, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=6740412
Enigma image: By William Warby from London, England - Enigma, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=46848023
CTR mode: By WhiteTimberwolf (SVG version) - Gwenda (PNG version), PNG version, Public Domain, https://commons.wikimedia.org/w/index.php?curid=26434109