An interface that does a subpar job of encrypting text.

To encrypt, put your desired plaintext (unencrypted text) into the "text" box, and then type in your key in the "Key" box, a whole number (the longer the better). Click "Encrypt" and you'll be good to go!

To decrypt, paste your encrypted text from earlier into the "text" box. Then, put the same key you used last time in the "Key" box. Hit decrypt.

If you see the "□" character, this means your text contained an unrecognized character.