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86 lines
1.9 KiB
Markdown
86 lines
1.9 KiB
Markdown
# Signal
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Open source application for secure messaging.
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Available for [Android][android app], [iOS][iOS app], Linux, Mac OS X, and Windows.
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1. [TL;DR](#tldr)
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1. [Further readings](#further-readings)
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1. [Sources](#sources)
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## TL;DR
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Conversations are end-to-end encrypted.
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Each and every one-to-one chat has its own unique _safety number_.<br/>
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It allows verifying one is communicating with the correct contact.
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When a safety number is marked as verified, a checkmark will appear in the chat header by that contact's name.<br/>
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It will remain like that unless the safety number changes or one manually changes the verification status.
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Signal notifies the user whenever a safety number has changed.
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When the safety number changes, it's as if one changed the locks and keys for the conversation.<br/>
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Messages sent _before_ the safety number changed use the old locks, and as such they will **not** be deliverable.
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SMS/MMS messaging _was_ supported in Android systems, but it has been removed
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[since october 2022][removing sms support from signal android].
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<!-- Uncomment if used
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<details>
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<summary>Setup</summary>
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```sh
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```
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</details>
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-->
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<!-- Uncomment if used
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<details>
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<summary>Usage</summary>
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```sh
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```
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</details>
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-->
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<!-- Uncomment if used
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<details>
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<summary>Real world use cases</summary>
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```sh
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```
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</details>
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-->
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## Further readings
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- [Website]
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- [Codebase]
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### Sources
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- [Help]
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- [Removing SMS support from Signal Android]
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<!--
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Reference
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═╬═Time══
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-->
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<!-- In-article sections -->
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<!-- Knowledge base -->
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<!-- Files -->
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<!-- Upstream -->
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[Android app]: https://play.google.com/store/apps/details?id=org.thoughtcrime.securesms
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[Codebase]: https://github.com/signalapp
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[Help]: https://support.signal.org/hc/en-us
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[iOS app]: https://apps.apple.com/app/id874139669
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[Removing SMS support from Signal Android]: https://signal.org/blog/sms-removal-android/
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[Website]: https://signal.org/
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<!-- Others -->
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