In addition to text and SMS messaging, Signal also supports secure voice (VoIP) and video calls between users. The beauty of this system is that Signal is almost transparent in use, which should make it easier to convince friends, family, and colleagues to use the app! I will discuss this issue more a little later. Because it is designed to replace your regular SMS client, Signal requires that you register with a valid phone number. This setup ensures that Signal is seamless to use when sending text messages to both other Signal users and to non-users. When sending an insecure text message you are warned that it is insecure and are encouraged to invite your contact to use Signal.
Messages to and from non-Signal contacts are sent using regular SMS text messaging and are not secure. Messages to and from other Signal users are sent over the internet and protected by very strong end-to-end encryption. Signal is primarily a secure and open source messaging app that replaces your Android phone or iPhone’s regular SMS app.
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