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Send me a locked STM32F1 chip and I'll send you back the binary contained in it. Not kidding. The problem with general purpose MCUs is that they are trivial to
by kosma 10y ago
Send me a locked STM32F1 chip and I'll send you back the binary contained in it. Not kidding. The problem with general purpose MCUs is that they are trivial to break.
- konstmonst 10y agoI would be very interested in the information on how can you do this :) We already use a Cypress PSoC5LP MCU with a flash protection feature as a License Manager(Essentially a TPM with encyption keys in locked flash) because we had a surplus of those. I am just trying to estimate if it is dangerous an should be changed. Our case is to prohibit Customers (mostly industry) from pirating firmware for new devices.
- userbinator 10y agoVarious companies in China and Russia will read locked MCUs for a fee. Search for "MCU Break". I know someone who uses one of these services to get the firmware for old industrial equipment whose manufacturer had long gone out of business or stopped providing support and replacing would cost far more. Total cost was <$1000USD, although that was an older MCU.
- lisper 10y agoCan you do that with an F4? If so, I'd like to take you up on your offer. I'll even pay you if you tell me how you did it.
- kosma 10y agoSecurity on F4 is way better. I haven't found a way to circumvent the JTAG fuse - but to be honest, I never really tried as I don't have access to proper glitching hardware.