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+---
+layout: doc
+title: Signal
+permalink: /doc/signal/
+---
+
+Signal
+======
+
+What is [Signal]?
+
+[According to Wikipedia:][signal-wikipedia]
+
+> Signal is an encrypted instant messaging and voice calling application
+> for Android and iOS. It uses end-to-end encryption to secure all
+> communications to other Signal users. Signal can be used to send and receive
+> encrypted instant messages, group messages, attachments and media messages.
+> Users can independently verify the identity of their messaging correspondents
+> by comparing key fingerprints out-of-band. During calls, users can check the
+> integrity of the data channel by checking if two words match on both ends of
+> the call.
+> 
+> Signal is developed by Open Whisper Systems. The clients are published as free
+> and open-source software under the GPLv3 license.
+
+How to install Signal in Qubes
+------------------------------
+
+If you're a Signal user on Android, you can now have Signal inside Qubes.
+
+1. Install the Chromium browser in a TemplateVM.
+2. Shut down the TemplateVM.
+3. Create a new AppVM based on this TemplateVM.
+4. Launch Chromium browser in the new AppVM, type `chrome://extensions/` in the
+   address bar, and follow the link to the Chrome app store.
+4. In the app store, search for "Signal Private Messenger" and install the app.
+5. The app launches automatically on first install. Follow the prompts to "link"
+   this app with your phone.
+6. Signal should now work in your AppVM.
+
+Creating a Shortcut in KDE
+--------------------------
+
+Let's make Signal a bit more usable by creating a shortcut in our desktop
+panel that launches Signal directly. This assumes that you're using KDE in Dom0
+and that your AppVM is named `Signal`.
+
+1. Create a Chromium shortcut (Q -> Domain: Signal -> Signal: Add more
+   shortcuts... -> Select "Chromium web browser")
+2. Follow [these instructions][shortcut] to create a desktop shortcut.
+3. Right-click on Chromium icon in panel and select "Icon Settings".
+4. Change the "Command" field of the "Application" tab to:
+
+        qvm-run -a --tray Signal '/usr/lib64/chromium-browser/chromium-browser.sh --profile-directory=Default --app-id=<long string which you'll get from the properties of the desktop shortcut you created above>'
+
+   **Note:** Another method (more "correct" but less straightforward) is to [use
+   the way Qubes handles shortcuts internally to create a `.desktop`
+   file][shortcut-desktop].
+5. (Optional) Copy the Signal app icon file from the Signal AppVM to dom0.
+   (**Warning**: copying untrusted files to dom0 is dangerous! Do this only if
+   you understand and accept the risks!)
+
+        [user@dom0]$ qvm-run --pass-io Signal 'cat /home/user/.local/share/icons/hicolor/48x48/apps/chrome-<long-appID>-Default.png' > /home/users/signal-icon.png
+6. (Optional) Change your new shortcut's icon from Chrome to Signal by pointing
+   it to `/home/users/signal-icon.png`.
+
+-----
+
+These instructions were contributed by Qubes community member Alex (IX4 Svs) in
+a [message] to the `qubes-users` [mailing list]. Thanks, Alex!
+
+
+[Signal]: https://whispersystems.org/
+[signal-wikipedia]: https://en.wikipedia.org/wiki/Signal_(software)
+[shortcut]: http://support.whispersystems.org/hc/en-us/articles/216839277-Where-is-Signal-Desktop-on-my-computer-
+[shortcut-desktop]: /doc/managing-appvm-shortcuts/#tocAnchor-1-1-1
+[message]: https://groups.google.com/d/msg/qubes-users/rMMgeR-KLbU/XXOFri26BAAJ
+[mailing list]: /mailing-lists/
+