OWS discontinues support for encrypted SMS/MMS messaging in TextSecure, while retaining its encrypted IM capabilities. OWS releases Signal as a RedPhone counterpart for iOS. OWS adds end-to-end encrypted group chat and instant messaging capabilities to TextSecure. Moxie Marlinspike leaves Twitter and founds Open Whisper Systems (OWS) as a collaborative open source project for the continued development of TextSecure and RedPhone. TextSecure and RedPhone are released as free and open-source software under the GPLv3 license. Marlinspike could help the then-startup improve its security.' Whisper Systems is acquired by Twitter, 'primarily so that Mr.

Moxie Marlinspike and Stuart Anderson ( Whisper Systems) launch TextSecure and RedPhone on Android. 1.3 2018–present: Signal Technology Foundation.Signal has been installed on more than 50 million Android devices. As of January 2021, Signal had more than 105 million total downloads, and the app had approximately 40 million monthly active users. The non-profit Signal Foundation was launched in February 2018 with initial funding of $50 million from Brian Acton. Signal also has an official client app for iOS and desktop apps for Windows, macOS and Linux (although registration requires an iOS or Android device). The official Android app generally uses the proprietary Google Play Services (installed on most Android devices), though it is designed to still work without them installed. Its mobile clients are published under the GPL-3.0-only license, while the desktop client and server are published under the AGPL-3.0-only license. Signal's software is free and open-source. The apps include mechanisms by which users can independently verify the identity of their contacts and the integrity of the data channel.

Signal uses standard cellular telephone numbers as identifiers and secures all communications to other Signal users with end-to-end encryption. It can also be used to make one-to-one and group voice and video calls, and the Android version can optionally function as an SMS app. Users can send one-to-one and group messages, which can include files, voice notes, images and videos. Signal is a cross-platform centralized encrypted instant messaging service developed by the non-profit Signal Technology Foundation and Signal Messenger LLC.

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