Whisper Systems was an enterprise mobile security company that was acquired by Twitter in November 2011. The company was co-founded by security researcher Moxie Marlinspike and roboticist Stuart Anderson in 2010. Some of Whisper Systems' software was made available under free software licenses after the acquisition, which led to the creation of OpenWhisperSystems. https://en.wikipedia.org/wiki/Whisper_Systems
Not Whisper Text.
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