Cipher guide
Vigenère cipher
A Vigenère cipher changes the move for each letter. A keyword repeats under the message. Each key letter tells you how far to move.
See a simple example
Give A the value 0, B the value 1 and so on. For the word MAP and the key KEY, M plus K gives W, A plus E gives E, and P plus Y loops round to N. The code is WEN.
Try it step by step
Write the repeated keyword under the coded message. Keep the letters in a straight line. To decode, move back by the value of each key letter.
Watch out for these mistakes
Do not lose your place when you reach a space. Use the same value system each time. When decoding, move back rather than forward.
Try it in Seven Worlds
The Vigenère board shows the keyword and the changing text while you work. This guide uses a new example, not a key or answer from the story.