Android 17 introduces new security features, including the ability to grant apps temporary access to precise location without sharing the entire address book. It enhances the "Mark as lost" feature in the Find Hub, allowing users to lock a missing device with biometrics. The update improves Live Threat Detection to block more suspicious applications and scams, and upgrades Advanced Protection mode. Stricter measures for PIN entry have been implemented, reducing the frequency of PIN guesses and increasing wait times between failed attempts.