add support for session encryption

Cargo.toml

@@ -9,6 +9,7 @@ log = "0.4.27"
 env_logger = "0.11.8"
 tap_core = {path = "tap_core"}
 cpal = "0.18.2"
+hex = "0.4.3"
 
 [workspace]
 members = ["tap_core", "tap_gui"]