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> This can mean several things, but it also means that users can never be 100 percent certain that the app they are downloading is entirely secure.

I wonder in what circumstances the author thinks users can be 100% certain that the app they are downloading is entirely secure. Cause, yeah, there aren't any.

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Presumably, if

1. the user is side-loading an app they wrote themselves (or is an internal Apple/Google developer who uploaded an app to their app store and audited the entire sausage-making process as it transpired),

and 2. the app does literally nothing,

then the user can be 100 percent certain that the app does what it does securely.

Only if your compiler/build process is trust worthy ;-)

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