NTP53X2 datasheet(112/133 Pages) NXP

112 / 133 page

NXP Semiconductors

NTP53x2

NTAG 5 link - NFC Forum-compliant I2C bridge

NTP53x2

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Product data sheet

Rev. 3.3 — 3 July 2020

COMPANY PUBLIC

544533

112 / 133

This signature can be retrieved using the READ_SIGNATURE command or with

the READ CONFIG command and can be verified in the NFC device by using the

corresponding ECC public key provided by NXP. In case the NXP public key is stored

in the reader device, the complete signature verification procedure can be performed

offline.

To verify the signature (for example with the use of the public domain crypto library

OpenSSL) the tool domain parameters shall be set to secp128r1, defined within the

standards for elliptic curve cryptography SEC.

NTAG 5 link provides the possibility to customize the originality signature to personalize

the IC individually for specific application. At delivery, the NTAG 5 link is pre-programmed

with the NXP originality signature described above. This signature is unlocked in the

dedicated memory. If needed, the signature can be reprogrammed with a custom-specific

signature using the WRITE CONFIG command during the personalization process by

the customer. The signature can be permanently locked afterwards by setting the Config

Header to “locked” with the WRITE CONFIG command to avoid further modifications.

In any case, it is recommended to permanently lock the originality signature during the

initialization process by setting the Config Header to lock with the WRITE CONFIG

command.

How to use and verify Originality Signature in applications is described in AN11350.

How to generate Originality Signature is described in AN11859.

NTP53X2 Datasheet(PDF) 112 Page - NXP Semiconductors