Lpc55s69 PUF fingerprint extraction

[satsok_n]

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. 

[ZhangJennie]

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

[satsok_n]

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.

[ZhangJennie]

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

[satsok_n]

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?

[ZhangJennie]

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

[satsok_n]

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