Skype, the popular internet phone calling app, is shutting down after being the pioneer of end-to-end encryption.In 2012, during the Egyptian revolution, it was discovered that Egyptian spies hacked Skype calls using a software called FinFisher.Skype's end-to-end encryption was a revolutionary feature at the time, offering unparalleled privacy in the mid-2000s.While Skype's user base has declined, its legacy lives on as end-to-end encryption has become the standard for popular chat apps.