The answer you've entered is not correct. Please try again!
Are you sure you want to start over?
This will reset the puzzle to its start state and reset all the data you've added or changed.
Puzzle 1 of 1
This is an interactive version of the Vigenère cipher that animates the encryption and decryption as it’s happening, given a piece of text to encrypt or decrypt and the key.
Click Step several times, and trace what’s happening. Pay attention to:
Encrypt a message as above, then:
You should see the original text emerge.
How hard would it be to crack a message encrypted with this cipher? Does the length of the key make a difference?