A question regarding security

[Quark]

In our product, we use fds_record_write to store some user data on NRF52's internal flash. Is it possible for a hacker to read out the user's data even we have set the read protect, such as hacking from the chip command level? If there is a potential way to do this, is there a suggestion for storing sensitive user's data? Thank you!

[Jared]

Hi,

Enabling read back protection by writing to the APPROTECT register will disable the SWD interface which blocks the debugger from writing and reading to all CPU registers and memory-mapped addresses. The only way to recover is to issue a nrfjprog --recover command which will erase the memory on the chip and enable the SWD interface. 

regards

Jared

[Quark]

That's exactly what we needed. Thank you, Jared!