Free Knowledge Culture Calendar/May 25
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![](http://upload.wikimedia.org/wikipedia/commons/thumb/c/c6/Chat_signal.png/220px-Chat_signal.png)
Today in 2014 was the first release of the encrypting communication applications RedPhone and TextSecure, which were later merged into Signal. Their groundbreaking end-to-end encryption protocol set a new standard and marked the state of the art for years and was integrated into WhatsApp, among others.