Systems And Methods For Integrity Checking Of Code Or Data In A Mixed Security System While Preserving Confidentiality

A method for providing secure integrity checking of code stored in a microcontroller including a processor and one or more memory devices collectively defining a memory space of the microcontroller, the memory space including a plurality of memory regions, the method comprising:

• storing, in a security attribution unit of the microcontroller, security attributes of each of the plurality of memory regions, the security attributes defining at least one secure memory region and at least one non-secure memory region;
• storing a plurality of integrity check tables in the memory space of the microcontroller, wherein each integrity check table is stored in one of the plurality of memory regions and includes information indicating a storage location of a respective piece of code within the memory space of the microcontroller;
• performing, by an integrity checking unit of the microcontroller, an integrity check management process including:
• receiving an integrity check request for checking the integrity of a first piece of code stored in the memory space of the microcontroller;
• based on the received integrity check request, accessing a first integrity check table of the plurality of integrity check tables, the first integrity check table indicating a storage location of the first piece of code;
• determining whether the first integrity check table and the first piece of code are stored in the same memory region of the plurality of memory regions;
• determining whether to perform the requested integrity check based at least on the determination of whether the first integrity check table and the first piece of code are stored in the same memory region;
• and
• if it is determined to perform the requested integrity check, accessing and performing an integrity check of the first piece of code.