topic Re: Lpc55s69 PUF fingerprint extraction in LPC Microcontrollers

Lpc55s69 PUF fingerprint extraction

satsok_n — Wed, 12 Jan 2022 22:42:41 GMT

I am using lpc55s69 in order to get advantage of the PUF example which is given by the SDK. Is there any way to extract the complete available fingerpring of the PUF memory? I would like to use it in a different way than the one which is given in the example.

Re: Lpc55s69 PUF fingerprint extraction

ZhangJennie — Thu, 13 Jan 2022 07:23:39 GMT

Hi satsok_n

I may not understand your question. Could you please specify what is " complete available fingerpring of the PUF memory"? Do you mean you want to extract all KC(key code)?

Thanks,

Jun Zhang

Re: Lpc55s69 PUF fingerprint extraction

satsok_n — Thu, 13 Jan 2022 08:14:06 GMT

Hi Zhang

By fingerprint I mean all the stable cells of memory which is used by PUF. I would like to create a stability map in order to use it in a different way.

Thanks

Re: Lpc55s69 PUF fingerprint extraction

satsok_n — Thu, 13 Jan 2022 13:05:11 GMT

In order to be more specific I took this figure from PUF manual. I would like to have independent access to SRAM stable data and the final Digital fingerprint.

Re: Lpc55s69 PUF fingerprint extraction

ZhangJennie — Fri, 14 Jan 2022 09:52:09 GMT

Hi satsok_n

PUF SRAM s not constant. Each new Enroll generates new data.

And there is no way to extract PUF SRAM data. If this can be done, the chip is not safe.

Have a nice day,

Jun Zhang

Re: Lpc55s69 PUF fingerprint extraction

satsok_n — Fri, 14 Jan 2022 10:03:41 GMT

Hi Zhang

Thanks for the response. I have 2 more questions. First, If I use the same activation code after the enroll to start the PUF means that I would have same SRAM cells values. Secondly, how do I get the same intrinsic key to use after I restart the device?

Re: Lpc55s69 PUF fingerprint extraction

ZhangJennie — Fri, 14 Jan 2022 14:46:13 GMT

Hi satsok_n

These questions are not related with the original question of fingerprint extraction. In order to seperate different subject, I would suggest you creating a new thread. We will help you further.

Thanks,

Jun Zhang