How Do You Encode And Decode Using The Vigènere Cipher?
• Obtain a Vigènere Square (pictured at the end of this article) or create a Vigènere Square on your own (see the Related wikiHows). • Think of a keyword that is shorter than the phrase or phrases you want to encipher. For this example we will use: LIME • Write down your message without spaces. For this example we will use: WIKIHOWISTHEBEST • Write the keyword under your message, carefully lining each letter up with a letter from your message. Do this until you run out of message: WIKIHOWISTHEBEST LIMELIMELIMELIME • Cut the keyword to fit the phrase if needed. In the example used for this article, the word LIME fits perfectly but when the keyword is not a perfect fit, there is no need to use the full word. For example: WIKIHOWISTHEBESTOFTHEBEST LIMELIMELIMELIMELIMELIMEL • Go to the row of the first letter of the keyword in the Vigènere Square and find the first letter of your phrase. Follow that column up to the ciphered letter. In the example, that would mean going to row L and findin
