The group's name and password have to be the same for all participants, username can be anything.
Most importantly their ECDH shared keys are XORed with the SHA-256 hashed group password, which results in that their communication cannot be deciphered via participants using another password - if multiple groups being created under the same name but with different passwords, then each group member will be visible only to the ones that entered with the common one.
CHATCRYPT's unique tri-layer encryption starts with a traditional secured Web Socket (wss) connection to the application server, then it builds up a custom Transport Layer Security within it, using ECDH (with NIST P-521 curve) for key exchange and AES-256 (in CTR mode) for ciphering.
On this second layer the messages sent from the server are signed with ECDSA (using ED25519 curve) and verified with a public key at the client.
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