http://qvt3o2ipzxx3gtoyafd3ptqwsxjs52enlwlxuryn2xjkm7hnp5icd6yd.onion/coyim/whats-new-v04/introduction/2022/02/13/whats-new-in-v04-improved-security.html
We also added support for something called channel binding, which ties
together the SCRAM authentication with the current TLS session. In this way, it becomes harder for an attacker to replay
or use the SCRAM challenge in a different connection. All of these are incremental improvements, but they move the CoyIM
state of security forward.