Send Signal Messages with Kicksecure

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How-to: Use Signal Private Messenger with Kicksecure.

Info COMMUNITY SUPPORT ONLY : THIS WHOLE WIKI PAGE is only supported by the community. Kicksecure developers are very unlikely to provide free support for this content. See Community Support for further information, including implications and possible alternatives.

Introduction[edit] is a well-respected, free, open source, cross-platform encrypted messaging service. It supports individual and group messages (files, voice notes, images and video) as well as one-to-one voice and video calls. All communications are encrypted end-to-end for security, and mechanisms exist to independently verify the identity of contacts as well as the integrity of the data channel. The encryption keys are generated and stored at the endpoints (user devices), rather than by the servers. Both the client and server code is openly published, and the software is recommended by noted privacy advocates Edward Snowden and Bruce Schneier, among others. This is due to the strong architecture and limited metadata available in the ecosystem. [1] [2] [3]

It is possible to install the standalone Signal Desktop application for Linux in Kicksecure. However, this configuration is not recommended because Signal requires the user provide a phone number for verification. [4] See Phone Number Validation vs User


Signal must already be installed on your Android or iOS device -- first follow the download on the Signal homepage if required. [5]

It is also recommended to create a separate Kicksecure that is only used for Signal because these instructions require the enabling of the Ubuntu Xenial repository for the desktop client. [6] The Signal developers do not maintain specific versions for other distributions, which is why Ubuntu is defaulted to.

Install the Signal Desktop Client[edit]

This configuration allows the standalone Signal desktop client to link with the mobile device and send/receive messages from a laptop or desktop computer. [7] As of late-2020, the desktop application also now supports one-to-one voice and video conversations. [8] After launching the desktop client, it must be linked with the (mobile) phone. Be aware that messages are synchronized with Signal on the mobile phone.

warning Security warning: Adding a third party repository and/or installing third-party software allows the vendor to replace any software on your system. Including but not limited to the installation of malware, deleting files and data harvesting. Proceed at your own risk! See also Foreign Sources for further information. For greater safety, users adding third party repositories should always use Multiple Kicksecure to compartmentalize VMs with additional software.

Kicksecure default admin password is: changeme Documentation in the Kicksecure wiki provides guidance on adding third-party software from different upstream repositories. This is especially useful as upstream often includes generic instructions for various Linux distributions, which may be complex for users to follow. Additionally, documentation Kicksecure usually has a higher focus on security, digital software signatures verification.

The instructions provided here serve as a "translation layer" from upstream documentation to Kicksecure, offering assistance in most scenarios. Nevertheless, it's important to acknowledge that upstream repositories, software may undergo changes over time. Consequently, the documentation on this wiki might need occasional updates, such as revised signing key fingerprints, to stay current and accurate.

Please note, this is a general wiki template and may not apply to all upstream documentation scenarios.

Users encountering issues, such as signing key problems, are advised to adhere to the Self Support First Policy and engage in Generic Bug Reproduction. This involves attempting to replicate the issue on Debian bookworm, contacting upstream directly if the issue can be reproduced as such problems are likely unspecific to Kicksecure. In most cases, Kicksecure is not responsible for, nor capable of resolving, issues stemming from third-party software.

For further information, refer to Introduction, User Expectations - What Documentation Is and What It Is Not.

Should the user encounter bugs related to third-party software, it is advisable to report these issues to the respective upstream projects. Additionally, users are encouraged to share links to upstream bug reports in the Kicksecure forums and/or make edits to this wiki page. For instance, if there are outdated links or key fingerprints in need of updating, please feel free to make the necessary changes. Contributions aimed at maintaining the currentness and accuracy of information are highly valued. These updates not only improve the quality of the wiki but also serve as a useful resource for other users.

The Kicksecure wiki is an open platform where everyone is welcome to contribute improvements and edits, with or without an account. Edits to this wiki are subject to moderation, so contributors should not worry about making mistakes. Your edits will be reviewed before being made public, ensuring the integrity and accuracy of the information provided.

1. Add the Signal GPG key to the APT keyrings. [9]

Securely download the key.

If you are using Kicksecure (kicksecure), run.


If you are using a Qubes Template (kicksecure-17), run. [10] [11]

http_proxy= https_proxy= scurl-download

Display the key's fingerprint. [12]

gpg --keyid-format long --import --import-options show-only --with-fingerprint keys.asc

Verify the output.

  • Digital signatures: A tool enhancing download security. Commonly used across the internet.
  • Learn more: Curious? Learn more about digital software signatures.
  • Optional: Digital signatures are optional. If you've never used them before, there might be no need to start now.
  • No worries: New to digital software signatures? It's okay, no need to worry.
  • Not a requirement: Not mandatory for using Kicksecure, but an extra security measure for advanced users.

The most important check is confirming the key fingerprint exactly matches the output below. [13]

Key fingerprint = DBA3 6B51 81D0 C816 F630 E889 D980 A174 57F6 FB06


Do not continue if the fingerprint does not match -- this risks using infected or erroneous files! The whole point of verification is to confirm file integrity.

Copy the signing key to the APT keyring folder. [14]

sudo cp keys.asc /usr/share/keyrings/signal-desktop-keyring.asc

2. Add the Signal third-party APT repository. [15] [16] [17]

echo 'deb [arch=amd64 signed-by=/usr/share/keyrings/signal-desktop-keyring.asc] tor+ xenial main' | sudo tee /etc/apt/sources.list.d/signal-xenial.list

3. Install Signal.

Install package(s) signal-desktop. Follow steps A to D.

A. Platform specific notice.

B. Update the package lists and upgrade the system The Web Archive Onion Version .

sudo apt update && sudo apt full-upgrade

C. Install the signal-desktop package(s).

Using apt command line --no-install-recommends The Web Archive Onion Version is in most cases optional.

sudo apt install --no-install-recommends signal-desktop

D. Platform specific notice.

E. Done.

The procedure of installing package(s) signal-desktop is complete.

4. Done.

The process of installing Signal is complete.

5. Note.

  • Kicksecure: No extra steps required.
  • Kicksecure-Qubes: Shutdown kicksecure-17 Template. Restart Kicksecure (kicksecure App Qube).

Start Signal[edit]

To launch Signal, run.


Figure: Signal Desktop in Kicksecure

Broken Metadata Protection[edit]

Signal's metadata protection (who is communicating with whom) might be ineffective.

Hi, thank you for this thought provoking talk. You said so many things I disagree with it is tough to pick a question. But the one I want to ask is: The features that you have about private groups and sealed sender, those seem to be protecting data at rest for when the server is compromised the data that's on it is less useful to the attacker, but if the server is already compromised it is not really providing traffic analysis protection - your metadata protection is effectively a pinky-promise oriented architecture and you have outsourced the keeping of the promise to a defense contractor owned by the richest man in the world; so my question it: How confident are you that Amazon is keeping the promises that you are making?

See this question and Moxie's (founder of Signal) answer Moxie failed to deny or refute this.

Amazon NSA collusion:

Amazon is proud of their cooperation with law enforcement and providing them with recordings from Amazon Ring the doorbell snitch. Hard to believe they don't collaborate with higher agencies such as the NSA of the security apparatus ladder.

Claims That Signal Encryption Is Broken[edit] formerly they were able to decrypt Signal encryption. However, the article details were later removed [18] because it was debunked by Moxie (co-founder and currently CEO of Signal Messenger), Edward, and Filippo Signal also responded to this false claim.

Note: cryptographer Bruce Schneier wrote an article about this issue in his blog entitled "Cellebrite Can Break Signal", but he later for his erroneous post.

Signal Delayed Updating Their Server Code On Time[edit]

Signal server code been to get updated to prevent spammers from gleaning the new anti-spam measures the company planned to enact (According to the signal CEO Moxie Marlinspike [19] [20]).

See Also[edit]


  2. For additional Signal features, see: Wikipedia: Signal (software) -
  3. Signal

    By design, Signal does not have a record of your contacts, social graph, conversation list, location, user avatar, user profile name, group memberships, group titles, or group avatars. The end-to-end encrypted contents of every message and voice/video call are protected by keys that are entirely inaccessible to us. In most cases now we don’t even have access to who is messaging whom.

  4. The number can be different form the device's SIM card; it can be a landline or VOIP number, so long as the user can receive the verification code and possesses a separate device to set up the software.
  5. Also see: Installing
  6. Common advice is to not mix repositories from related distributions like Ubuntu and Debian, since this can cause system instability.
  10. Using Qubes UpdatesProxy ( because Qubes Templates are non-networked by Qubes default and therefore require UpdatesProxy for connectivity. (APT in Qubes Templates is configured to use UpdatesProxy by Qubes default.)
  11. Even more secure would be to download the key Disposable and then it to the Qubes Template because this would avoid curl's attack surface but this would also result in even more complicated instructions.
  12. Even more secure would be to display the key in another Disposable because this would protect the Template from curl's and gpg's attack surface but this would also result in even more complicated instructions.
  13. Minor changes in the output such as new uids (email addresses) or newer expiration dates are inconsequential.
  17. See this for a comment why tor+ is useful even inside Kicksecure.

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