Protected access with ST25R25 or CR95HF

[STHOR.1]

Dear Sir/Madame,

I'm currently using ST25R95 for a design and I have a question from my software colleagues.

Is the device capable of writing on Tags with a protected acess (by password for example)  ? 

We are using NFC TAGs Type 1.

We would like to garantee that we can read and write the memory of the tags but without the possibility to copy what we are reading.

We would like to ensure that no other reader than our can access to the memory of the tags.

Thx in advance,

Sincerely,

S.T

[Ulysses HERNIOSUS]

Hi STHOR.1,

what you describe will require strong cryptography. Type 1 Tag according to NFC Forum spec does not implement any protection / cryptography.

An NFC reader/writer is able to arbitrary frames. All protection etc is up to the upper software layers using the chip / our software libraries.

Best Regards, Ulysses

[Brian TIDAL · Accepted solution]

Hi Sebastien,

for your information, a C library for the ST25R5 is available on st.com (X-CUBE-NFC3 package). It provides a polling demo (polls for various tag technologies and displays tag UID) and NDEF demo (NDEF read and write). It is a good starting point for customer application development.

Another information, type 1 tags are getting soon deprecated by NFC Forum. I would rather recommend to use ST25TA or ST25TV tags that support password protection features. The X-CUBE-NFC3 supports the ST25TV password protection commands

Rgds

BT

[STHOR.1]

Hi Ulysses and Brian,

Thank you for your both answers.

Regards,

S.T.