Secure Dynamic Messaging Backend Server Example

Some of the example SDM values below were taken from AN12196: "NTAG 424 DNA and NTAG 424 DNA TagTamper features and hints".

NTAG 424 DNA: Plaintext tag UID, read counter mirroring with SDMMAC (CMAC)
/tagpt?uid=041E3C8A2D6B80&ctr=000006&cmac=4B00064004B0B3D3
NTAG 424 DNA: Encrypted PICC Data mirroring with SDMMAC (CMAC)
/tag?picc_data=EF963FF7828658A599F3041510671E88&cmac=94EED9EE65337086
NTAG 424 DNA (LRP mode): Encrypted PICC Data mirroring with SDMMAC (CMAC)
/tag?picc_data=1FCBE61B3E4CAD980CBFDD333E7A4AC4A579569BAFD22C5F&cmac=4231608BA7B02BA9
NTAG 424 DNA: Encrypted PICC Data mirroring with additional SDMFileData and SDMMAC (CMAC)
/tag?picc_data=FD91EC264309878BE6345CBE53BADF40&enc=CEE9A53E3E463EF1F459635736738962&cmac=ECC1E7F6C6C73BF6
NTAG 424 DNA TagTamper: Encrypted PICC Data mirroring with additional SDMFileData and SDMMAC (CMAC); TagTamper enabled and with TTStatusOffset = ENCDataOffset
/tagtt?picc_data=FDD387BF32A33A7C40CF259675B3A1E2&enc=EA050C282D8E9043E28F7A171464D697&cmac=758110182134ECE9
NTAG 424 DNA TagTamper (LRP mode): Encrypted PICC Data mirroring with additional SDMFileData and SDMMAC (CMAC); TagTamper enabled and with TTStatusOffset = ENCDataOffset
/tagtt?picc_data=8EE8E27DE3974FFE245F96C71087129B2E8449C9FF346F65&enc=48987A0D55638C017D1F4DC3D8ADD910&cmac=862E781E52244A75
WebNFC Example: Reading tags directly from Chrome using WebNFC feature

Source code: https://github.com/nfc-developer/sdm-backend

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