I'm looking for an app (mobile or web) that can encrypt messages with a good level (like Signal or Telegram, but on which the users are anonymous.
On signal or telegram, you can be sure of the other's identity because it is ensured by their phone number. I want the users to have personals ID (random numbers or nicknames) that don't have any link with their real identity.
Thus, if I want to communicate with a friend, we just have to exchange our IDs.
Is there such an app?