flexDF2 DESFire EV2 8kB NFC

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

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$249.00 $199.00

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WARNING This kit definitely contains dangerous things. The flexDF2 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.

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.

Professional installation notes

Installation of a flexDF2 device should always be done by a professional.

  • Do not install under any gripping surface (e.g. no palm side installations)
  • Do not install atop or parallel to any joints (flex devices are only “semi-flexible”)
Scalpel Procedure
  • Make a 8mm wide incision in skin
  • Lift & separate dermal layer using elevator tool
  • The subdermal “pocket” should be at least 35mm deep
  • Remove all tools from installation site
  • Slide flex device under skin with sterile gloves – no forceps or tools
  • Suture to close wound – do not pierce flex device while suturing
Needle Procedure
  • Incise skin using a 4g (5mm diameter) piercing needle, bevel side down
  • Carefully insert the needle to a depth of at least 35mm
  • Be sure to lift the skin ahead of the needle’s point as you insert it
  • Slide flex device under skin with sterile gloves – no forceps or tools
  • Achieve complete hemostasis before applying bandaging
  • Use re-enforced butterfly bandage or dermal strips to pull wound closed
  • Apply transparent film (tegaderm) dressing overtop the dermal strips
  • While hemostasis is maintained, do not remove bandaging for 7-10 days

Important things to know about the flexDF2

– The biopolymer is ISO 10993 and USP Class IV tested and certified, however the final product has not been tested post-processing, meaning material changes during processing could render the final product unsafe in some way. Testing is planned for later, however beta testers have had the flexNT since April 2016 and report no issues. Dangerous Things founder and CEO Amal Graafstra underwent the first installation of a flexNT beta device on 03/02/2016 above the second metacarpal of the middle finger of his left hand. So far the installation has healed excellently and there are no signs of rejection or irritation at the installation site.

– There is no “preferred” location for installation of a flex device. Customers are free to install a flex into any area of the body their installation professional is comfortable with, as long as it is in the fascia layer between dermis and muscle tissue and not in an area of flexion or under a gripping surface. Even though we use images which suggest installation above the second metacarpal of one of the fingers, it is not an ideal location for such a device. Fingers are filled with tendons, nerve bundles, and very important things all packed into a very tight space. We urge you to think about easier locations like the back of the hand or in the arm/wrist.

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
  • INS code ’88’ for INTERNAL AUTHENTICATE
  • INS code ’82’ for EXTERNAL AUTHENTICATE

Interesting DESFire EV2 features