Necta /mei vending machines

They have two machines near the place I work.

An Astro Necta (food) and a Rondo Necta (coffee). They use blue RFID sticks called “Mark”made by Mei group.

They’ve a NXP PCF7931AS hitag2 chip inside.

I’ve no time to use them the way I’d like  but since I was unable to find info about Necta machines I’ll publish it here.

https://www.usenix.org/system/files/conference/usenixsecurity12/sec12-final95.pdf

Revisited attack with code for the GPU:

http://ebookbrowsee.net/gdoc.php?id=425681537&url=7d5efeca9bfb55deb4507edb2459cb35

I’ve no idea it this actually works or not: http://www.xfpga.com/html_products/Hitag2-card-key-cloner-33.html

Imagen