Signal is actually not a new app, rather it has been around
since around a decade. A startup called Whisper Systems, built an enterprise
mobile security software that was bought by Twitter. While Twitter wanted the
co-founder to up the security game of the said software, Matthew Rosenfeld
skipped it and created Open Whisper Systems.
The product line of Open Whisper Systems constituted of
RedPhone and TextSecure. Both of these products later on went to become Signal
in 2015. During this time, Google, WhatsApp and Facebook made Signal protocol
their security foundation for their messaging services. Signal, on the other
hand, kept on being a niche offering and only relied on Freedom of Press
Foundation.
In 2018, Signal got some spotlight when the co-founder of
WhatsApp, Brian Action invested $50 million into new Signal Foundation. “Signal
will pioneer a new model of technology nonprofit focused on privacy and data
protection for everyone, everywhere”, he noted at the time.