Hur säkert är Privnote?

Briar is a messaging app designed for activists, journalists, and anyone else who needs a safe, easy and robust way to communicate. Unlike traditional messaging apps, Briar doesn’t rely on a central server - messages are synchronized directly between the users’ devices. If the internet’s down, Briar can sync via Bluetooth or Wi-Fi, keeping the information flowing in a crisis. If the internet’s up, Briar can sync via the Tor network, protecting users and their relationships from surveillance.

Briar is designed to resist surveillance and censorship by an adversary with the following capabilities:

All long-range communication channels (internet, phone network, etc) are comprehensively monitored by the adversary.
The adversary can block, delay, replay and modify traffic on long-range communication channels.
The adversary has a limited ability to monitor short-range communication channels (Bluetooth, WiFi, etc).
The adversary has a limited ability to block, delay, replay and modify traffic on short-range communication channels.
The adversary can deploy an unlimited number of devices running Briar.
There are some users who can keep their devices secure - those who can’t are considered, for the purposes of the threat model, to be controlled by the adversary.
The adversary has a limited ability to persuade users to trust the adversary’s agents - thus the number of social connections between the adversary’s agents and the rest of the network is limited.
The adversary can’t break standard cryptographic primitives.