miss.cabul/Shutterstock Signal is one of the most secure private messaging apps around. Developed by the nonprofit organization Signal Foundation, the free messaging service offers end-to-end encryption for all communications sent through the platform, including text, voice calls, images, and videos — made possible by its innovative open source Signal Protocol. As a result, no one can access your conversations with others on Signal, not even the Signal organization itself. In addition, the messaging app only requires users to submit their telephone number to sign up, with Signal Foundation promising no ads, affiliate marketers, or tracking. As such, Signal has become a popular choice for hackers and activists, with the company openly supporting protests in 2020 and even rolling out a feature that easily allows users to blur faces  to help protect protestor identities.…