In this video, explore the fascinating history of ciphers, from ancient Greek military communication to modern-day cryptography. Discover unsolved cases like Kryptos at CIA HQ, the Zodiac Killer ciphers, and the mysterious Dorabella Cipher. Plus, learn about the embarrassing unsolved D'Agapeyeff cipher.

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More information on the images used in this video:

00:42 Kryptos background - Kryptos01_1,_background_removed.png: *Kryptos01_1.jpg: Jim Sanbornderivative work: Minh Nguyễn (talk, contribs)Kryptos01_1.jpg: Jim Sanbornderivative work: Minh Nguyễn (talk, contribs), CC BY-SA 3.0 https://creativecommons.org/licenses/..., via Wikimedia Commons

Kryptos image by Lars Plougmann (Attribution-ShareAlike (CC BY-SA 2.0)) obtained from https://flic.kr/p/ahSRby

Vigenere Table with Numbers - Armchair, CC BY-SA 4.0 https://creativecommons.org/licenses/..., via Wikimedia Commons

06:24 My Name is Cipher - Zodiac
2230redondo, CC BY-SA 4.0 https://creativecommons.org/licenses/..., via Wikimedia Commons

09:01 Octaves-notes-ru
Sergey Pushkin, CC BY-SA 4.0 https://creativecommons.org/licenses/..., via Wikimedia Commons