To play another user, please enter a nickname above. Once you have done that, you click on the name of the opponent you wish to play from the list of available players.
You will then be taken to the next screen where you will select if you want to play using Caesar or Vigenère cipher. Caesar cipher is the easier one to start with.
You take turns being the defender that asks the question (encrypting) and being the attacker that answers the question (decrypting). The player that starts the game will start as defender. The system checks that you have done the encryption correctly. You alternate between defender and attacker after each round. There are 10 rounds, 5 as attacker, 5 as defender.
There are 4 minutes for the defender to ask a question and 4 minutes for the attacker to answer the question.