An art installation known as Kryptos was inaugurated at CIA headquarters in late 1990. The main attraction was a curved copper screen inscribed with a secret message. Three-quarters of the code have since been broken, but the final segment has resisted all attempts at decipherment. This video chronicles the cracking of the first three segments and examines the many clues that may one day lead someone to decipher the fourth. 𝐂𝐫𝐞𝐝𝐢𝐭𝐬, 𝐫𝐞𝐟𝐞𝐫𝐞𝐧𝐜𝐞𝐬, 𝐚𝐧𝐝 𝐦𝐨𝐫𝐞 𝐒𝐮𝐩𝐩𝐨𝐫𝐭 𝐦𝐞 𝐨𝐧 𝐏𝐚𝐭𝐫𝐞𝐨𝐧 𝐒𝐮𝐩𝐩𝐨𝐫𝐭 𝐦𝐞 𝐨𝐧 𝐘𝐨𝐮𝐓𝐮𝐛𝐞 𝐒𝐨𝐜𝐢𝐚𝐥𝐬 Bluesky: 𝐂𝐡𝐚𝐩𝐭𝐞𝐫𝐬 00:00 Intro 02:30 The Vigenère Table 05:45 Partial Decipherment of Kryptos 07:46 Identifying Ciphers Within the Code 11:09 Breaking K2 15:21 Breaking K3 and K1 17:49 The K1-K3 Plaintext 24:02 The Mystery of K4 27:21 The Intended Solutions 36:50 The IDBYROWS Mishap 39:56 The K4 Clues 41:44 Hypothetical Solutions to K4 45:45 Outro