CyberCertPrepMobile Security FundamentalsMobile Data StorageEASYFree question
Scenario
You are a mobile application security engineer reviewing how this app stores sensitive data at rest.
Which iOS NSFileProtection class should a developer choose for a file that must remain readable while the app processes background uploads even after the device is locked by the user?
- A.NSFileProtectionComplete
- B.NSFileProtectionCompleteUntilFirstUserAuthentication
- C.NSFileProtectionCompleteUnlessOpen
- D.NSFileProtectionNone
Why C is correct
NSFileProtectionCompleteUnlessOpen keeps a file accessible as long as it was opened before the lock; it stays open for background tasks even after the screen locks. NSFileProtectionComplete revokes access immediately on lock, breaking background uploads. NSFileProtectionCompleteUntilFirstUserAuthentication is accessible after first unlock until reboot but does not distinguish whether the file is open. NSFileProtectionNone offers no protection and is the wrong choice for sensitive files.
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