People were concerned about the https://diceroll.games/ server being able to learn the results and potentially impersonate a player, so all of the clients now perform an N-way Diffie-Hellman shared key derivation that they then use as a symmetric session key for end-to-end encrypted dice games.
https://diceroll.games/ e2e encrypted chat comes along for free once all of the other crypto bits are there, so I added an input box to let you tell the other player when you're waiting on their roll.