Signal earned the title of the most secure instant messaging app for a reason. First, Signal uses end-to-end encryption that encodes and decodes messages of any kind only by using the dedicated sender’s and recipient’s devices. Second, Signal protects not only its users’ correspondence but their metadata as well. Very few peer-to-peer encrypted messaging apps do so. Moreover, to eliminate MITM attacks, the Signal Protocol was enhanced with the Double Ratchet algorithm. In addition to public and private keys, it creates session keys that are linked to a particular message and self-destruct after the recipient receives that message. With a well-thought-out approach to its users’ security and privacy, neither the server owner nor the hackers are able to intercept messages in the Signal app.