Applying clock glitches to some microcontrollers could be difficult. For example, the Texas Instruments MSP430 microcontroller family operates from an internal RC generator in bootloader mode and it is difficult to synchronise to the internal clock and estimate the exact time of the attack. Some smartcards benefit from having randomly inserted delays in the CPU instruction flow, which makes applying the attacks even more difficult. Using power analysis could help, but requires very sophisticated and expensive equipment to extract the reference signal in real time.

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