Is it possible for a "secure messaging app" to operate on an insecure hardware or insecure operating system like iOS or Android? In other words, can a messaging app "compensate for" unknown exploits/backdoors in the underlying hardware or operating s

**TL;DR:** Is it possible for a "secure messaging app" to operate on an insecure hardware or insecure operating system like iOS or Android? In other words, can a messaging app "compensate for" unknown exploits/backdoors in the underlying hardware or operating system?

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