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Hello, is it possible to prevent third parties from accessing an external nand-flash or sd card were the firmware resides, encryption or some other ic in between? the mcu i have to use is sam9x25 from atmel thanks
If you used another IC in between, then the output of that one would be unencrypted. The only useful solution is decryption inside the processor.
-- Marcus http://www.doulos.com/arm/