Are there not any apps that do this? I notice that signal unlocks when you unlock the phone; are there not e2e messaging apps that require authentication (wheth

Are there not any apps that do this? I notice that signal unlocks when you unlock the phone; are there not e2e messaging apps that require authentication (whether passcode or biometric) on unlocked devices? Just checked, Signal has this; does this actually serve to unencrypt the encryption key or is that still accessible as root?