In iOS you can specify that files in an app's sandbox are "encrypted" when the device is locked. https://developer.apple.com/library/mac/documentation/FileMana

In iOS you can specify that files in an app's sandbox are "encrypted" when the device is locked. https://developer.apple.com/library/mac/documentation/FileManagement/Conceptual/FileSystemProgrammingGuide/FileSystemOverview/FileSystemOverview.html#//apple_ref/doc/uid/TP40010672-CH2-SW21 https://developer.apple.com/library/mac/documentation/FileMa... (See "Files Can Be Encrypted On Disk") Implementing the feature is pretty trivial and works on a file by file basis https://developer.apple.com/library/ios/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/StrategiesforImplementingYourApp/StrategiesforImplementingYourApp.html#//apple_ref/doc/uid/TP40007072-CH5-SW21 https://developer.apple.com/library/ios/documentation/iPhone... (See "Protecting Data Using On-Disk Encryption") More details about the options here: https://developer.apple.com/library/ios/documentation/Cocoa/Reference/Foundation/Classes/NSData_Class/index.html#//apple_ref/c/econst/NSDataWritingFileProtectionComplete https://developer.apple.com/library/ios/documentation/Cocoa/... https://developer.apple.com/library/ios/documentation/Cocoa/Reference/Foundation/Classes/NSFileManager_Class/index.html#//apple_ref/c/data/NSFileProtectionComplete https://developer.apple.com/library/ios/documentation/Cocoa/...