3 ms·How do I know that you, the creator of the password pairs, are not an enemy's spy?by motxilo 16y agoHow do I know that you, the creator of the password pairs, are not an enemy's spy?Gupie 16y agoHow do I know that you, the selector of the 100 digit number, are not an enemy spy?motxilo 16y agoEvery "good" spy chooses his X, and sends the corresponding Y to the guards. No need to involve a 3rd person in between like in your solution.