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updated template to debian-9
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doc Signal /doc/signal/

Signal

What is Signal?

According to 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

CAUTION: Before proceeding, please carefully read On Digital Signatures and Key Verification. This website cannot guarantee that any PGP key you download from the Internet is authentic. Always obtain a trusted key fingerprint via other channels, and always check any key you download against your trusted copy of the fingerprint.

  1. (Optional)Create a TemplateVM (Debian 9)

    [user@dom0 ~]$ sudo qubes-dom0-update qubes-template-debian-9

  2. Open a terminal in Debian 9

    [user@dom0 ~]$ qvm-run -a debian-9 gnome-terminal

  3. Use these commands in your terminal

    (Optional)[user@debian-8 ~]$ sudo apt-get install curl
[user@debian-8 ~]$ curl -s https://updates.signal.org/desktop/apt/keys.asc | sudo apt-key add -
[user@debian-8 ~]$ echo "deb [arch=amd64] https://updates.signal.org/desktop/apt xenial main" | sudo tee -a /etc/apt/sources.list.d/signal-xenial.list
[user@debian-8 ~]$ sudo apt update && sudo apt install signal-desktop

  4. Shutdown the TemplateVM :

     [user@dom0 ~]$ qvm-shutdown debian-9

  5. Create an AppVM based on this TemplateVM

  6. With your mouse select the Q menu -> Domain: "AppVM Name" -> "AppVM Name": Add more shortcuts (or "AppVM Name": VM Settings -> Applications). Select Signal from the left Available column, move it to the right Selected column by clicking the > button and then OK to apply the changes and close the window.