This is mozaiq's steganograpy service. With this tool, you can hide messages in plain site inside of pictures that you can then safely share. No one will be able to see or read the message.
You can either choose your own picture or have mozaiq choose one at random for you. The password is optional but will be required to reveal the message, so don't forget it!
To retrieve the hidden message, use the decryption page. Be sure to share the decryption page with your intended recipient separately from the message.