Vigenére Ciphers

A 16th century French diplomat, Blaise de Vigenere, created a very simple cipher that is moderately difficult for any unintended parties to decipher. It is somewhat like a variable Caesar cipher, but the N changed with every letter. You would "encode" your message with a passphrase, and the letters of your passphrase would determine how each letter in the message would be encrypted.

This is the exact opposite of a "Variant Beaufort." To do the variant, just "decode" your plain text to get the cipher text and "encode" the cipher text to get the plain text again.

If you wanted even more security, you can use two passphrases to create a keyed Vigenere cipher, just like the one that stumped cryptologists for years. Again, a pretty simple trick, but it can ensure that your message is even harder to crack.

Recently, a judge created his own "Smithy Code" in a legal document, but some errors were made. You can see what people consider to be the correct code with the fixes in upper case.


Your message:

This is your encoded or decoded text:

Hoyle wrote his first rule book in 1742, "A Short Treatise on the Game of Whist." Besides Whist, it also listed rules for every game from backgammon to quadrille. He soon became the authoritative source for rules for all card and board games. Tyler Akins <>
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