Device and method for executing protected iOS software modules

A method for executing code of an application of an application package comprising a first version and a second version of the application, the first version intended to be executed on a genuine device and the second version intended to be executed on a jailbroken device, the method comprising in a device:

• determining by at least one hardware processor a jailbreak status of the device;
• computing by the at least one hardware processor an integrity value for the code;
• deriving by the at least one hardware processor a decryption key based on at least the jailbreak status and the integrity value;
• and
• in case the jailbreak status indicates that the device is genuine:
• decrypting by the at least one hardware processor using the decryption key at least a first part of the first version stored in a memory of the device to obtain a first processed part;
• and
• executing, by the at least one hardware processor using the first processed part, the first version;
• and
• in case the jailbreak status indicates that the device is jailbroken:
• decrypting by the at least one hardware processor using the decryption key at least a second part of the second version stored in the memory to obtain a second processed part;
• and
• executing by the at least one hardware processor the second processed part.