Signal protocol used by Signal provides end-to-end encryption for voice, video and instant messaging. It was developed by Open Whisper Systems in 2013 and it was later introduced to create the open-source TextSecure App.
Signal protocol development is based an earlier protocol called TextSecure by Whisper systems. Later encryption of voice lead to the RedPhone. All of this together got into Signal. another company called G Data Software launched a messaging app called Secure Chat which used Signal protocol. Google's Allo messaging app also uses Signal. Google discontinued Allo in favor of Messages app on Android. Microsoft and Whisper Systems announced Signal support for Skype in an optional Skype feature called Private Conversations.
Signal App can do most of what WhatsApp can do. This is because, WhatsApp is based on Signal. The WhatsApp's Status feature uses Signal to secure its contents. Facebook has a feature called Optional Mode, Secret Conversations in Facebook messenger which provides end-to-end encryption using an implementation of the Signal Protocol.
Signal has a long history of its encryption features that has been leverage by many.
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