Secret MCU decryption technology
Lead: At present, chip decryption is mainly used in PCB copy board. In addition to the simple concept of board copying, PCB copy board also includes the decryption of some encryption chips on the board. With the strengthening of patent concepts and knowledge protection, chip decryption will gradually develop towards the direction of program research services, rather than the current direction of product replication.
Chip decryption is also called single-chip decryption, single-chip crack, chip crack, IC decryption, we decrypt CPLD, DSP decryption is used to call chip decryption. The MCU attacker uses the special or self-made equipment to exploit the loopholes or software defects in the design of the MCU chip, and extracts the key information through various technical means. The program in the MCU is the chip decryption technology.
Chip decryption belongs to the industry at the edge of the law, but the benevolent sees the wise and sees wisdom. A person in charge said that the chip decryption is just a knife, and there is no right or wrong in itself. However, it is in the hands of the person who holds it, and what to do with the knife, finally determines the quality of its nature.
Regardless of the nature of chip decryption, the chip decryption technology itself is also a sophisticated high-end technology, which requires a solid reverse engineering knowledge and rich decryption experience. Otherwise, it is very likely that the decryption failed, and the "master piece" was lost. General decryption methods include: software attacks, electronic detection attacks, fault generation techniques, and probe techniques.
Software attack technology
Software attack decryption technology, that is, soft decryption technology, is to find out the design defects of the single-chip computer through software, and read the internal OTP/falsh ROM or eeprom code. This chip decryption method is not optimal because the research time is too long and the same series The microcontrollers are not the same for each.
Electronic detection attack technology
Electronic detection attack techniques typically monitor the analog characteristics of all power and interface connections of the processor during normal operation with high temporal resolution and perform attacks by monitoring its electromagnetic radiation characteristics. Because the microcontroller is an active electronic device, when it executes different instructions, the corresponding power consumption of the power supply changes accordingly. In this way, by using special electronic measuring instruments and mathematical statistical methods to analyze and detect these changes, specific key information in the microcontroller can be obtained.
Fault generation technology
The fault generation technique uses abnormal working conditions to cause the processor to fail and then provides additional access to the attack. Attacks that use the widest range of faults include voltage surges and clock surges. Low voltage and high voltage attacks can be used to disable protection circuitry or force the processor to perform erroneous operations. Clock transients may reset the protection circuit without damaging the protected information. Power and clock transients can affect the decoding and execution of a single instruction in some processors.
Probe technology
Decryption of probe technology and FIB technology is a very popular method of chip decryption, but at a certain cost. First, save the Config (configuration file) of the MCU with the programmer, use it after the file is made, and then use the nitric acid to remove the package. Under the microscope, use the micro-probe to test the result. The microscope is taken into a picture and completed by FIB connection or cutting. Of course, there is also a need to use the programmer to read the program without using the FIB probe.
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