> If China was allowing Signal to operate within China, the most logical and simple explanation would have been that China had backdoor access. It still isn't

> If China was allowing Signal to operate within China, the most logical and simple explanation would have been that China had backdoor access. It still isn't the simplest explanation. The simplest one is probably that there were simply too few Signal users. The complete source code for the Signal applications and the Signal server is available on GitHub. This way, anyone can review the code for security and correctness. An existing backdoor would mean that every expert review of the source code in this field has been faulty. And the fact that I can set up my own Signal server and compile my own client supports Signal's claim of being a secure messenger. The possibility of manipulation through Apple and the App Store process remains. However, this is by no means the simplest solution.