User's Manual

ACG HF Multi ISO RFID Reader V1.0
ACG Identification Technologies GmbH 105
Two-Pass Authentication Flow Diagram
Host Reader
1. Start Authentication Step 1 StartAuth 
2. Generate Random number
RndRdr
 RndRdr 3. Reply Random number
4. Generate Random number
RndH
5. Calculate the MAC of the
key management
MacH = Enc(RndRdr)
6. Transmit Random number
and MAC: RndKm,MacH
RndKm,MacH

7. Check the received MacH
RndRdr = Dec(MacH)
8. Calculate the MAC of the
reader
MacRdr = Enc(RndH)
 MacRdr 9. Reply MAC
10. Check the received
MacRdr
RndH = Dec(MacRdr)?