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= Guide to Using Matrix with the Element App =

Matrix is a secure, decentralized communication protocol that supports end-to-end encryption (E2EE). This guide covers creating a Matrix account, installing the Element app via F-Droid, setting it up, and using key features such as verification, encryption, key backup, and data backup.

== Benefits of Using Matrix ==

* '''Decentralization:''' Matrix operates on a federated network, allowing users to choose or run their own homeserver, reducing reliance on centralized providers.
* '''End-to-End Encryption (E2EE):''' Messages in 1:1 chats and optionally in group rooms are encrypted by default, ensuring only communication partners can read the content.
* '''Privacy:''' By selecting privacy-friendly servers (e.g., in the EU) and using E2EE, users retain control over their personal data.
* '''Interoperability:''' Matrix supports bridges to other platforms (e.g., Signal, WhatsApp, IRC), enabling cross-platform communication.
* '''Open Source:''' The Matrix standard and clients like Element are open-source, promoting transparency and community development.
* '''Flexibility:''' Users can choose from various clients (e.g., Element, FluffyChat) and devices (desktop, mobile, web) without losing functionality.
* '''Self-Hosting:''' Organizations or individuals can run their own Matrix servers for full control over data and infrastructure.
* '''Scalability:''' Matrix is suitable for private chats, large community rooms, and even institutional communication (e.g., at universities).
* '''Verification:''' QR code or emoji-based verification ensures protection against man-in-the-middle attacks.
* '''Cost-Free:''' Matrix and clients like Element are free to use, with many public servers offering free registration.

== Installing the Element App via F-Droid ==
The Element app is the recommended client for Matrix. For Android users, installing via F-Droid is a secure and privacy-friendly option. Alternatively, you can use the FluffyChat app, the Element browser app, or the Element or FluffyChat desktop app.

# Download the F-Droid version of the Element X app from the official website (https://f-droid.org) and install it.
# Open F-Droid and search for “Element X” (ensure you select the “Element X” app if creating a new account).
# Install the app and open it.

== Creating a Matrix Account ==
Matrix accounts are created via a Matrix server (homeserver). You can create a new account on public servers like matrix.org or others listed below.

# Download the Element app (see “Installing the Element App” section).
# Open the app and select “Register” (for public servers).
# Keep the default server as “matrix.org” or enter a server of your choice.
# Enter a username, password, and optionally an email address during registration.
# Follow the instructions for verification (e.g., via email).

'''Note:''' Ensure you update the app via F-Droid to receive the latest security updates.

== Setting Up the Element App ==
After installation, configure the app to use Matrix optimally.

# After successful registration or login:
# Enable desktop notifications (optional, can be adjusted later).
# Set up key backup (see “Key Backup and Data Backup”) to ensure encrypted chats remain accessible.
# Verify your devices (see “Verification and Encryption”) to ensure security.

'''STORE YOUR PASSWORD AND KEYS IN A SECURE LOCATION!'''

'''Note:''' Use the Element desktop client or mobile app instead of a browser tab to avoid encryption issues. A closed browser tab may result in encrypted messages becoming unreadable.

== Public Matrix Servers ==
Public Matrix servers allow new user registration and are ideal for those without access to institutional servers. Below is a selection of stable, public homeservers suitable for beginners (based on hello-matrix.net):

* '''matrix.org''': The official homeserver of the Matrix Foundation. Very stable but occasionally overloaded due to its popularity. Suitable for general use, though it may test pre-release server software, causing occasional instability.
* '''allmende.io''': Operated by the ecobytes association in Germany, focused on socio-ecological projects. Stable and privacy-friendly, ideal for users in Germany.
* '''matrix.sp-codes.de''': A public server in Germany, operated by Samuel Philipp. Suitable for users preferring a smaller, community-oriented server.
* '''matrix.ctseuro.com''': A public server focused on privacy, operated by Karl M. Joch. A good alternative to matrix.org.
* '''matrix.luug.ru''': Operated by the Linux User Group Novosibirsk, hosted on Hetzner (Germany). Good connectivity for European users, especially from Russia.
* '''matrix.hackerspaces.be''': A server run by the Belgian hackerspace community, open for public registration. Ideal for tech-savvy users.
* '''matrix.polish.social''': A server in Poland, primarily serving the Polish Matrix community but open to all. Suitable for European users.
* '''chat.karotte.org''': A server in France, operated by a computer science student. Offers a stable platform for international users.

'''Notes on Server Selection:'''
* Choose a server geographically close to you to minimize latency.
* Check the server’s privacy policies, as some may store metadata (e.g., usernames or room affiliations).
* Avoid registering only on matrix.org to support federation and reduce server overload.
* A more comprehensive list of public servers is available at https://www.hello-matrix.net.

== Key Features: Verification and Encryption ==
Matrix supports end-to-end encryption (E2EE), where messages are decrypted only on the communication partners’ devices. This requires verification and key backup.

=== End-to-End Encryption (E2EE) ===
* '''How it works:''' Messages are encrypted on your device and decrypted only on the recipient’s device. Even the server operator cannot read the content.
* '''Default:''' 1:1 chats are E2EE-encrypted by default. For group rooms, E2EE must be manually enabled (Settings > Room > “Enable encryption”).
* '''Note:''' Once E2EE is enabled for a room, it cannot be disabled. Verifying all participants in large rooms can be time-consuming.

=== Verification ===
Verification ensures you are communicating with the correct person and prevents man-in-the-middle attacks.

# Open a chat or room and click the person icon (top right).
# Select the person to verify and click “Verify.”
# Choose a verification method:
* '''QR Code:''' Scan the other device’s QR code during an in-person meeting.
* '''Emojis:''' Compare the displayed emojis with your communication partner (e.g., over the phone or in person).
# Confirm if the codes/emojis match (“They match”).
# Repeat for each device used by you or your communication partner.

'''Note:''' Without verification, messages may be marked as “unverified,” compromising security. Enable the setting (Security & Privacy > “Encrypt to verified sessions only”) to communicate only with verified devices.

== Key Backup and Data Backup ==
Key backup is critical to access encrypted messages after logging out, switching devices, or closing a browser tab. Without key backup, encrypted chats may be lost.

=== Setting Up Key Backup ===
# After your first login, Element prompts you to set up key backup. Click “Continue.”
# Choose between:
* '''Security Phrase:''' Create a strong, memorable password. This is required at each login to sync keys.
* '''Security Key:''' The generated security key (12 blocks of 4 characters, starting with “E”) is saved securely as “security-key.txt” and can be printed.
# Store the security key securely (e.g., in a password manager, as a file, or printed).
# Confirm your identity with your Element account password.

'''Note:''' Key backup stores your cryptographic keys encrypted on the homeserver. Without the security phrase or key, you cannot access old encrypted messages.

=== Backing Up Keys ===
* '''Why it’s important:''' Without a backup, you lose access to encrypted chats if you log out, close a browser tab, or lose a device.
* '''Steps:'''
# Export room keys manually (Settings > Security & Privacy > Encryption > “Export E2E room keys”).
# Store the exported file securely (e.g., on a USB drive or in a password manager).
# Import keys on a new device if needed (Settings > Security & Privacy > “Import E2E room keys”).
* '''Recommendation:''' Keep at least one verified session active (e.g., on a desktop client or smartphone) to avoid key loss. In the future, the “dehydrated devices” feature will simplify this.

=== Resetting Key Backup ===
If you lose your security phrase and key:
# Log out of all sessions except one where you still have access to encrypted messages.
# Export room keys (see above).
# Delete the old key backup (Settings > Security & Privacy > “Secure Backup” > “Reset backup”).
# Set up a new key backup and store the new security key securely.
'''Note:''' Without access to an existing session or security key, encrypted messages are permanently lost.

== Tips and Notes ==
* Use the Element desktop client or mobile app to avoid key loss from closed browser tabs.
* Always verify new devices with an existing verified device or your security phrase/key.
* Matrix does not support email invitations. Use the username or Matrix ID (@username:server.de) to invite people.

== Sources ==
* Matrix documentation from TU Dresden: https://doc.matrix.tu-dresden.de
* Matrix documentation from Darmstadt University of Applied Sciences: https://its.h-da.io
* Matrix documentation from KIT: https://docs.matrix.kit.edu
* Blog post on Matrix encryption: https://sp-codes.de
* List of public Matrix servers: https://www.hello-matrix.net

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Waldbursche: Die Seite wurde neu angelegt: „= Guide to Using Matrix with the Element App = Matrix is a secure, decentralized communication protocol that supports end-to-end encryption (E2EE). This guide…“