proxmark3 snoop crack M1

use a proxmark3 to sniff the communication between a mifare card reader and mifare use the sniffed data to crack the method is suitable for all mifare can use nested command to crack other keys of the card. 1. connect the proxmark3 to the computer, connect the hf antenna to proxmark3. 2. open the software, typte hf 14a snoop to let the proxmark3 into sniff mode. 3. put the hf antenna near the mifare card, It will sniff the communication between reader a