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.

Revisited attack with code for the GPU:

I’ve no idea it this actually works or not: