FlexDF2 DESFire EV2 8kB


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flexDF2 DESFire EV2 8kB NFC

The flexDF2 is one of our next generation, high performance, RFID and NFC compliant transponders. The flexDF2 is coated in USP Class VI, ISO 10993 tested biopolymer which gives it an extremely thin profile and semi-flexible structure suitable for installation just about anywhere. The DESFire EV2 8kB NFC Type 4 multi-application chip inside the flexDF2 allows large, cryptographically secured data storage. They are shipped in small sealed plastic tubes with chlorhexidine solution.


flexDF2 Specifications

WARNING This kit definitely contains dangerous things. The flexDF transponder device has not been tested or certified by any regulatory agency for implantation or use inside the human body. Use of this device is strictly at your own risk.

  • 13.56MHz ISO14443A & NFC Type 4 DESFire EV2 chip
  • Huge 8kB multi-application memory space
  • 7mm x 32mm x 0.5mm flexible biopolymer package

Flex Installation

We have installation photos of a FlexDF Installation which you can view Here

![](/images/Innovation/FlexDF/FlexDF Install markup.jpeg)

Installation procedure

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– Do not install under any gripping surface (e.g. no palm side installations) – Do not install atop or parallel to any joints (flex device are only “semi-flexible”) – Incise skin with scalpel, making 9mm wide incision – Lift/separate dermal layer using elevator tool – Remove dermal tools from installation site – Slide flexNT under skin by hand, do not use gripping tools – Suture to close wound, do not pierce flexNT with suture needle

The DESFire EV2 chip

  • 13.56MHz ISO14443A & NFC Type 4 DESFire EV2 RFID chipset
  • Full datasheet for the NXP DESFire EV2 RFID/NFC chip
  • 7 byte UID and 8K bytes of user read/write memory
  • 25 year data retention. Rated for 500k writes per memory block.
  • Encased in 3mm by 13mm bioglass with non-toxic epoxy
  • Pre-tested and pre-loaded into sterile injection assembly
  • No “anti-migration” coating means easy removal/replacement

DESFire EV2 chip specifications include

  • Common Criteria certification: EAL5+ (Hardware and Software)
  • Optional RANDOM UID for enhance security and privacy
  • Mutual three pass authentication
  • Mutual authentication according to ISO/IEC 7816-4
  • Flexible keys: 1 card master key and up to 14 keys per application
  • Hardware DES using 56/112/168 bit keys featuring key version
  • Hardware AES using 128-bit keys featuring key version
  • Data authenticity by 8 byte CMAC
  • Data encryption on RF-channel
  • Authentication on application level
  • Hardware exception sensors
  • Self-securing file system
  • Backward compatibility to MF3ICD40: 4 byte MAC, CRC 16

ISO/IEC 7816 features

  • File structure (selection by File ID or DF name)
  • APDU message structure
  • APDU wrapper for MIFARE DESFire native commands
  • INS code ‘A4’ for SELECT FILE
  • INS code ‘B0’ for READ BINARY
  • INS code ‘D6’ for UPDATE BINARY
  • INS code ‘B2’ for READ RECORDS
  • INS code ‘E2’ for APPEND RECORD
  • INS code ’84’ for GET CHALLENGE

Interesting DESFire EV2 features