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Smart Cards Lab COMPGA12 University College London

Example 4: You SIM card ATR (with a USB SIM reader, or with a

normal reader such as Omnikey 5321 and a simple adaptor. Type in the

ATR obtained:

Copy here are the explanations given by the program:

8.5 ATR and ATS, RFID/Contacless Cards

With RFID cards, there is no ATR. But there is ATS = Answer To Select.

Many RFID cards still don’t do have an ATS, then the windows PC/SC

interface will simulate/synthetise the answer and return an ATR that con-

tains an ATS (that can also be simulated if not implemented).

8.6 Variable ATS

Example 5: Your Electronic Passport ATR (if diﬀerent, type in manually):

Encoding: In these examples it is possible to see that ATR is 3B8C8001

+ 11 bytes ATS + checksum byte.

Remark: For older passports ATR is ﬁxed, for more recent ones to pro-

tect people’s privacy they are variable (!). However in order for the passport

to provide a diﬀerent ATR, one has to switch oﬀ and on the magnetic ﬁeld

Nicolas T. Courtois 2009-10

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Classic Electronics Smart 4F Especificaciones Pagina 15