Hi Alex,
Thank you for your reply. I am trying to break AES OFB, I am not sure if I can get access to the data due to limited access to the chip. There is a probe point that I can use to check decrypted data on start up but I haven’t checked if I can get data out of it during normal operation yet.
As this is just to prove that the key is recoverable, being able to use it on the data it’s self wasn’t actually a goal from this.
The main thing is I can’t remove or modify the chip and I can’t control the data that it is receiving and encoding. Hence why I was originally looking at a tempest attack but then I came across the ChipWhisperer and it seemed like it would solve alot of other issues I expected to encounter with interference.
The clock speed is only 4 Mghz, is this something that can be used against it?
I will investigate further exactly what access I can get as there may be another point on the circuit board that I can get the input or output data rather than directly from the chip.
Thank you once again for your reply and I would appreciate any assistance in pointing me in the right direction.
Regards,
Max