ELI5: How do we know that "secure" chat apps like Signal are actually secure?

This page summarizes the projects mentioned and recommended in the original post on /r/explainlikeimfive
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  • TextSecure

    A private messenger for Android.

  • Signal is open source. So anyone can view the code, propose changes, or make their own variant of it. This means experts can inspect and review the code for backdoors and flaws. You can find the Android source here. While being open source does not guarantee security, a popular open source project will have many eyes on it. As a result glaring flaws can and will get noticed and reported.

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NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.

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