To meet security compliance , can deleted files get recovery in nRF51822

[iotdev123]

hi all

A silly question here , I am prepare to meet some security compliance , one of them is about delete files permanently.

I wonder how to get this done on nRF51822? Maybe I should ask this in another way. Is there is anyway to recovery the deleted files? 

Thanks for the answer.

[awneil]

What "files" are you referring to?

The nRF51822 itself does not have any file system

[iotdev123]

the Flash memory I mean 

[awneil]

Erasing flash does physically erase the memory contents. It's not like deleting a file in a file system which, typically, just removes the entry from the "index" - leaving the data physically present on the storage medium.

Whether it's possible to determine "previous programmed value" with, say, a scanning electron microscope after de-capping the chip - I don't know.

What level of attack are you trying to protect against?

[iotdev123]

Your reply had answered my question.

Thank you Sir.