Enforcing screenshot prevention rules, mitigating cheating in games (not just competitive ones, but also just to force microtransactions).
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They're barely even using that narrative. They don't seem worried about perception but rather anti-trust issues from their messaging on it.
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Note how https://developer.android.com/training/safetynet/attestation.html … makes it out to be some kind of compatibility / anti-fragmentation feature. Standard excuse they have.
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It's not at all what it checks though. The only relation to compatibility is that they have a system for approving devices for Google Play.
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So they are already set up to gather information about each build of every device shipping Google Play, and they could provision TZ keys.
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Or use existing hardware-bound keys like the Qualcomm Crypto Engine hardware-bound key that's specific to TrustZone rather than the OS one.
End of conversation
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