Microcontroller chip with data extraction encryption function

Abstract

The invention relates to a microcontroller chip with a data extraction encryption function. A small-capacity random access nonvolatile memory is arranged in the chip while the chip is provided with an off-chip nonvolatile memory access interface. When the chip is used, after a data transformation unit embedded into the microcontroller chip carries out full-text correlative transformation on a code and critical data, the code and the critical data are split into two parts which are respectively stored in the on-chip nonvolatile memory and the off-chip nonvolatile memory, wherein the data transformation unit aggregates and recovers two parts of data whendata are read. The code and the data of the off-chip nonvolatile memory are transformed and the data are incomplete, so that the code and the data cannot be stolen or illegally accessed. According to the microcontroller chip, the risk of illegal access of data is effectively avoided when the code and the critical data of the existing embedded system are external, and meanwhile, the high operand cost of a conventional encryption algorithm and the risk introduced during key transfer are reduced, and thus an efficient and cheap data protection solution is provided for the embedded system.

Description

technical field [0001] The invention relates to the field of semiconductor chips, in particular to a microcontroller chip with data extraction and encryption functions. Background technique [0002] Embedded system is an application-centric, computer-based computer system with tailorable software and hardware, which meets the strict requirements of the application system on function, reliability, cost, volume, and power consumption. With the rapid development of embedded technology, embedded products have been widely used in various fields such as industrial control, traffic management, information appliances, furniture intelligent management system, POS (Point of Sale, sales terminal) network and e-commerce. However, with the rapid development of information technology, consumers have put forward higher requirements for the security management of embedded systems. Therefore, how to realize the anti-diffusion, anti-theft and anti-cracking of the information stored in the em...

AI Technical Summary

Problems solved by technology

When a third party obtains the non-volatile memory of the embedded system, it is very easy to obtain and crack the relevant information of the embedded system. On the one hand, the intellectual property rights of the self-developed software cannot be protected, and can be copied at a very low cost; on the other hand , the stored key data is easy to be illegally used after being cracked

Although a large number of microcontroller products have begun to embed non-volatile storage technology to protect codes and key data, the cost of embedded storage is high and the overall capacity is small, especially for smart devices that require complex software and operating system operating environments. Therefore, in many applications, the code still has to be stored in off-chip non-volatile memory

Embedded systems that store system codes in plain text have great potential information security risks. If system codes are stored in cipher text, the complex encryption algorithm will greatly reduce the operating performance of the system, and once the secret key and encryption algorithm are leaked, illegal Molecules can still obtain data access content by intercepting the interface timing between the microcontroller and the off-chip non-volatile memory

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