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Marlinspike could help the then-startup improve its security". The acquisition was done "primarily so that Mr. Neither company disclosed the financial terms of the deal. In November 2011, Whisper Systems announced that it had been acquired by Twitter.
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All of these were proprietary enterprise mobile security software and were only available for Android. Whisper Systems also produced a firewall and tools for encrypting other forms of data. The beta versions of RedPhone and TextSecure were first launched in May 2010 by Whisper Systems, a startup company co-founded by security researcher Moxie Marlinspike and roboticist Stuart Anderson. Signal is the successor of the RedPhone encrypted voice calling app and the TextSecure encrypted texting program. It also adds support for encrypted group calling. Signal starts transitioning to a new encrypted group chat system with support for group admins, and more granular permissions. Signal adds message requests and one-to-one voice and video calling to Signal Desktop. Signal adds support for iPads, view-once images and videos, stickers, and reactions. Moxie Marlinspike and Brian Acton launch the Signal Foundation with an initial $50 million in funding from Acton, who had left WhatsApp's parent company Facebook in September 2017. OWS transitions Signal's calling system from RedPhone to WebRTC and adds the ability to make video calls with the mobile apps. OWS announces the deprecation of their Chrome App and the release of a new Electron-based Signal Desktop. Signal Desktop is launched as a Chrome App.
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RedPhone is merged into TextSecure on Android and the app is renamed as Signal. At the same time, OWS adds encrypted IM to Signal on iOS. 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.
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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.
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Signal also has an official client app for iOS and desktop programs 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 client software includes 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 Foundation and Signal Messenger LLC.
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