As for MCU break (microcontroller unit), hardware security in microcontrollers is being constantly improved. Because the tools for mcu break are becoming more sophisticated, better and better security protection is required. Rapid co-evolution is driven by this continuous battle between chip manufacturers and chip attackers.
Another threat that must be considered is that a great deal of second-hand semiconductor manufacturing and testing equipment appears on the market. It cannot be used to break high-end MCUs, but should be enough to break MCU chips manufactured with older technology. For example, while 90 nm manufacturing technology is currently leading-edge, most MCUs are produced with 0.35 µm technology and smartcards with 0.25 µm technology.
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