Integrated circuit

An integrated circuit comprising:

• a safety processor;
• a memory;
• a secure computing module comprising:
• a secure processor;
• first and second cryptographic units for encrypting and decrypting data in the memory;
• and
• first and second data transfer units for transferring data between the memory and the first and second cryptographic units respectively,
• wherein the first cryptographic unit and the first data transfer unit provide a first cryptographic data handling system, and the second cryptographic unit and the second data transfer unit provide a second cryptographic data handling system;
• and
• a switch,
• wherein the secure computing module further comprises:
• selector circuitry for selectively coupling and uncoupling the first and second cryptographic data handling systems in response to control signals from the switch, such that:
• in a first mode, the first and second cryptographic data handling systems are uncoupled and operable independently of each other;
• and
• in a second mode, the first and second cryptographic data handling system are coupled and operable together to provide hardware redundancy,
• wherein the secure computing module further comprises a first cryptographic signature or hash engine and a second cryptographic signature or hash engine, and
• wherein:
• the first cryptographic data handling system and the first cryptographic signature or hash engine are operable to process a first code block in a booting process;
• and
• the second cryptographic data handling system and the second cryptographic signature or hash engine are operable to process a second code block during the booting process.