Protecting user data in the face of attack

Attackers attempting to extract user data often try a number of techniques: extracting the encrypted data to another medium for brute-force attack, manipulating the operating system version, or otherwise changing or weakening the security policy of the device to facilitate attack. Attacking data on a device often requires communicating with the device using physical interfaces like Lightning or USB. Apple devices include features to help prevent such attacks.

Apple devices support a technology called Sealed Key Protection (SKP) that works to ensure cryptographic material is rendered unavailable off device, or if manipulations are made to operating system version or security settings without appropriate user authorization. This feature is not provided by the Secure Enclave, instead it is supported by hardware registers that exist at a lower layer in order to provide an additional layer of protection to the keys necessary to decrypt user data independent of the Secure Enclave.

Note: SKP is available only on devices with an Apple-designed SoC.

Feature	A10	A11, S3	A12, S4	A13, S5	A14, M1, S6
Sealed Key Protection

iPhone and iPad can also be configured to only activate data connections in conditions more likely to indicate the device is still under the physical control of the authorized owner.

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Protecting user data in the face of attack