Apple iOS 4 Security Evaluation
Apple iOS 4 Security Evaluation
Apple iOS 4 Security Evaluation
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Encryption LayersEntire filesystem is encrypted using block-based encryption with File SystemKeyFSK is stored on the flash, encrypted using key derived from UID KeyEach file has a unique encryption key stored in an extended attribute,protected by Class KeyClass Keys are stored in the System KeyBagSome Class Keys are protected by a key derived from the user’s passcode(Passcode Key)Certain Class Keys are also protected by the device-specific UID Key that isembedded in hardware and inaccessible to code running on CPU
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