Power Glitch AT89C51 Links

Русская фирма, занимающаяся чтением защищенных микросхем:
https://russiansemiresearch.com/ru/catalog/


Ссылки на фирмы и описание стирания локбита:
https://www.eevblog.com/forum/microcontrollers/need-a-help-for-chip-dump/
Power glitch protection unlock worked on  very old date code AT89C51/52. That was fixed in early 2000's IIRC. Very unlikely that you have a microcontroller that old unless they used really old stock. The trick was to start erasing and shut down the power almost instantly. Lock bit became erased while firmware itself remained intact (first byte often got also corrupted but could be easily restored by manual brute force).


Форум: https://www.edaboard.com/showthread.php?2383-breaking-8051-lock-bits
I tried the method in the above url. It works!!
It will only do very old 8051. I was ALSO able to unlock an 89C51 (up to date code year 1999) using a power glitch method. It was very easy. How could atmel have made these ridiculous mistakes back then? Of course, they fixed the problems and my method does not work in year 1999 chips and newer.


Мнетод power glitch:
Copy Protection in Modern Microcontrollers - Sergei P. Skorobogatov
https://www.cl.cam.ac.uk/~sps32/mcu_lock.html
Если я правильно понимаю метод - предлагается вызывать сбой питания. Либо просто отключая его рандомно, либо подключить через резистор осцилл и померять сколько кушает питания чип и подать напряжение только для переходных процессов.


AT89C51 glitching
http://caps0ff.blogspot.com/2019/10/at89c51-glitching.html

Видео про power glitch
https://www.youtube.com/watch?v=6Pf3pY3GxBM

iCEBreaker Glitcher
https://www.youtube.com/watch?v=FVUhVewFmxw
https://github.com/SySS-Research/icebreaker-glitcher


V4:Tutorial A3 VCC Glitch Attacks
https://wiki.newae.com/V4:Tutorial_A3_VCC_Glitch_Attacks