Transaction MAC Feature
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The Transaction MAC (TMAC) feature allows smart cards like MIFARE DESFire EV3 and MIFARE Plus EV2 to generate a message authentication code (MAC) for offline transactions between a reader terminal and the smart card. The TMAC helps establish trust by proving the authenticity and validity of transactions when reported to the backend system. It can detect fraudulent activities like replayed, forged, manipulated, or missing transactions by verifying the MAC covers all transaction details and is generated with a secure TMAC key. Technical details are provided on how to enable and use the TMAC feature for different applications and data blocks on each card.
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Transaction MAC Feature
- 1. EXTERNAL NXP, THE NXP LOGO AND NXP SECURE CONNECTIONS FOR A SMARTER WORLD ARE TRADEMARKS OF NXP B.V. ALL OTHER PRODUCT OR SERVICE NAMES ARE THE PROPERTY OF THEIR RESPECTIVE OWNERS. ? 2020 NXP B.V. 3 1 S T J U LY 2 0 2 0 Sandra Fuchs Principal Customer Application Engineer TRANSACTION MAC A MIFARE? DESFire? EV3 & MIFARE Plus? EV2 KEY FEATURE VIDEO
- 2. 1EXTERNAL TRANSACTION MAC TO HELP PREVENT FRAUDULENT MERCHANT ATTACKS O F F L I NE T R AN S AC T I O N S W I T H S E C U R E VAL I D AT I O N ? The Transaction MAC (TMAC) feature allows the infrastructure operator / POS operator / merchant to prove the genuineness and authenticity of executed transactions between the reader terminal and the IC inside a smart card ? Helps to establish trust in a multi-service provider system ? Proving that every transaction is genuine towards the backend system via secure verification of transaction validity ? Card generated TMAC covers all transaction details, allowing to detect: ? Forged or fraudulent transactions ? Replay of transactions ? Unreported and missing transactions Preventing fraudulent merchant attacks Generating a MAC for the transaction, proves genuineness of executed transactions Allows to detect replayed, manipulated or missing transactions using the TMAC counter
- 3. 2EXTERNAL TRANSACTION MAC TO HELP PREVENT FRAUDULENT MERCHANT ATTACKS O F F L I NE T R AN S AC T I O N S W I T H S E C U R E VAL I D AT I O N Backend Clearing House Offline Transaction TMAC Key AES128 TMAC TMAC Key AES128 Reader Terminal Service Provider Y Reader Terminal Service Provider Z
- 4. 3EXTERNAL TECHNICAL DETAILS: HOW TO ENABLE TRANSACTION MAC FEATURE ON THE CARD On MIFARE DESFire EV3 ? Can be enabled independently for each application ? Established by creating a Transaction MAC file inside the application ? Correct access rights for Transaction MAC file need to be set ? Desired Transaction MAC key needs to be written into Transaction MAC file in a secure way ? Once enabled, Transaction MAC will be calculated automatically by the IC with every CommitTransaction command targeting the application, and returned to the reader On MIFARE Plus EV2 ? In total, four Transaction MAC Keys can be configured on the IC ? Each TMAC Key is connected to one TransactionMACBlock which contains current TMAC Value and Counter plus one TransactionMACConfiguratinBlock ? TransactionMACConfiguratinBlock specifies which MIFARE Plus data or value blocks shall be protected by Transaction MAC ? Once enabled, Transaction MAC will be calculated automatically by IC when updating one or more protected blocks ? Write / Transfer / Increment Transfer / Decrement Transfer commands trigger Transaction MAC finalization and updating of TransactionMACBlocks
- 5. 4EXTERNAL MORE INFORMATION ABOUT TRANSACTION MAC FEATURE Item Number Availability Datasheet - MIFARE DESFire EV3 DS4489 NXP Docstore (confidential) Datasheet - MIFARE Plus EV2 DS5223 NXP Docstore (confidential) Application Note - MIFARE DESFire EV3 Quick-Start Guide AN5755 NXP website (public) Application Note - MIFARE DESFire EV3 Features and Hints AN5881 NXP Docstore (confidential) Application Note - Feature and Functionality Comparison between MIFARE DESFire EV2 and MIFARE DESFire EV3 AN5756 NXP website (public) Application Note - MIFARE Plus EV2 Features and Hints AN5760 NXP Docstore (confidential) Application Note - Comparison between MIFARE Plus EV2 and previous types AN5762 NXP Docstore (confidential) RFID Discover Software SW1866 NXP Docstore (confidential) NXP Reader Library (Windows based) SW1717 NXP Docstore (confidential) https://www.nxp.com/products/rfid-nfc/mifare-hf/mifare-desfire https://www.nxp.com/products/rfid-nfc/mifare-hf/mifare-plus https://www.docstore.nxp.com/
- 6. NXP, THE NXP LOGO AND NXP SECURE CONNECTIONS FOR A SMARTER WORLD ARE TRADEMARKS OF NXP B.V. ALL OTHER PRODUCT OR SERVICE NAMES ARE THE PROPERTY OF THEIR RESPECTIVE OWNERS. ? 2020 NXP B.V.