WhatsApp confirmed the partnership to reporters, but there was no announcement or documentation about the encryption feature on the official website, and further requests for comment were declined. Open Whisper Systems said that they had already incorporated the protocol into the latest WhatsApp client for Android and that support for other clients, group/media messages, and key verification would be coming soon after. On 18 November 2014, Open Whisper Systems announced a partnership with WhatsApp to provide end-to-end encryption by incorporating the Signal Protocol into each WhatsApp client platform. TextSecure compatibility was added to the iOS application in March 2015. Signal was the first iOS app to enable easy, strongly encrypted voice calls for free. The developers said that their next steps would be to provide TextSecure instant messaging capabilities for iOS, unify the RedPhone and TextSecure applications on Android, and launch a web client. These announcements coincided with the initial release of Signal as a RedPhone counterpart for iOS. Toward the end of July 2014, Open Whisper Systems announced plans to unify its RedPhone and TextSecure applications as Signal. In February 2014, Open Whisper Systems introduced the second version of their TextSecure Protocol (now Signal Protocol), which added end-to-end encrypted group chat and instant messaging capabilities to TextSecure. Marlinspike launched Open Whisper Systems' website in January 2013. Marlinspike later left Twitter and founded Open Whisper Systems as a collaborative open source project for the continued development of TextSecure and RedPhone. RedPhone was also released under the same license in July 2012. Twitter released TextSecure as free and open-source software under the GPLv3 license in December 2011. Some criticized the removal, arguing that the software was 'specifically targeted people under repressive regimes' and that it left people like the Egyptians in 'a dangerous position' during the events of the 2011 Egyptian revolution. Shortly after the acquisition, Whisper Systems' RedPhone service was made unavailable. Marlinspike could help the then-startup improve its security'. The acquisition was done 'primarily so that Mr. The financial terms of the deal were not disclosed by either company. In November 2011, Whisper Systems announced that it had been acquired by Twitter. They also developed a firewall and tools for encrypting other forms of data. Among these were an encrypted texting program called TextSecure and an encrypted voice calling app called RedPhone. The company produced proprietary enterprise mobile security software. Security researcher Moxie Marlinspike and roboticist Stuart Anderson co-founded a startup company called Whisper Systems in 2010.

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