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Smart Cards Lab COMPGA12 University College London

In fact with an RFID reader there is no serial communication between

the card and the reader at all. The PC/SC layer and the reader basically

simulate the presence of a smart cards, so that RFID smart cards are seen

as normal smart cards with contact. So T=CL is just a convention to say it

is something completely diﬀerent than T=0 or T=1, Commands are trans-

lated by the reader’s ﬁrmware in a non-transparent way. In fact this is an

important security feature, part of the security of the system is implemented

in a tamper-resistant chip on the smart card reader side. The hacker has no

idea what the RFID tag is actually sending and receiving.

Quiz With a native USB smart card, from the point of view of the PC/SC

layer, the card will appear as:

always block-oriented T=1 we will say that T=CL.

With modern readers and software the choice of communication protocol

is done automatically. The windows PC/SC layer hides the communication

protocol from us, so that the only thing we have to worry about is to send

and receive strings of bytes (APDUs).

8.4 Real-life ATR Examples

Again we type:

isotype.py

Example 1: London Oyster Card + ACR122 or Omnikey 5321 reader.

Your Oyster Card ATR:

The program will give you a number of explanations regarding the mean-

ing of this ATR. Should be the same as in Section 8.3.

Example 2:

University building pass ATR (if diﬀerent, type in manually):

Example 3:

Your bank card ATR (type in manually):

Copy here are the explanations given by the program:

Nicolas T. Courtois 2009-10

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Classic Electronics Smart 4F Especificaciones Pagina 14