Which android unique identifiers requests do not raise privacy concerns?

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I have an app in which I want to create unique identifier per device. Which properties can I access from the sdk which will not ask special permissions at install time (so it won't raise privacy concerns from users), that can help? I was thinking imei, android-advertising-id, mac-address, installed-apps, etc.

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Try using the Build.FINGERPRINT because Accessing Build.VERSION.SDK_INT doesn't require any special authorities.