iPhone data protection in depth - Sogeti ESEC Lab
iPhone data protection in depth - Sogeti ESEC Lab
iPhone data protection in depth - Sogeti ESEC Lab
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IntroductionData <strong>protection</strong>Storage encryptioniTunes BackupsConclusionIntroductionEffaceable areaHFS Content ProtectionHFSExplorerData WipeFilesystem encryptionAlgorithm• AES <strong>in</strong> CBC mode• Initialization vector depends on logical block number• Hardcoded key for system partition (f65dae950e906c42b254cc58fc78eece)• 256 bit key for <strong>data</strong> partition (EMF key)IV computationvoid iv_for_lbn ( unsigned long lbn , unsigned long *iv){for ( <strong>in</strong>t i = 0; i < 4; i ++){if(lbn & 1)lbn = 0 x80000061 ^ ( lbn >> 1);elselbn = lbn >> 1;iv[i] = lbn ;}}<strong>iPhone</strong> <strong>data</strong> <strong>protection</strong> <strong>in</strong> <strong>depth</strong> 31/59
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