Didn't we all use secret codes as children to send messages to each other that no one else would understand? Those codes were usually pretty easy to launch and to break, and sometimes even involved a magic decoder ring found in a box of cereal. But some codes and ciphers took vast teams to solve, or remained secret for hundreds of years. It's pretty hard to solve a code when the person who designed it is long dead, and the you don't even know what the original language might be. Yet the right person with the right skills can do it. In this video, we learn the stories behind nine famous codes that were once considered unbreakable intil someone figured them out. They include the Enigma code, Linear B, the Purple code, the Vigenère cipher, the Zodiac killer's cryptograms, the Copiale cipher, the Voynich manuscript, Holy Roman Emperor Charles V's letters, and Edgar Allan Poe's ciphers, which turned out to be the least important of them all.