its a caesar decryptor If you want to encrypt, then: 1. Type your message 2. Put in a number, (without a "-" sign please.) This is the key. 3. Ctrl/Cmnd + C, Ctrl/Cmnd + V If you want to decrypt, then: 1. Type your message 2. Put in the key (with a "-" sign please.) 3. Ctrl/Cmnd + C, Ctrl/Cmnd + V