Classic Electronics Smart 4F Especificaciones descargar pdf (Pagina 34)

Smart Cards Lab COMPGA12 University College London

However if the PIN is correct, the counter for the number of CHV at-

tempts will be reset to 3.

14.4 Cryptographic Functionality of a SIM Card

Imagine that the base station in GMS sends to the mobile phone a 16-byte

random. Choose one example or write your own (the length MUST be 16

bytes):

RUN GSM ALGORITHM

CLA INS P1 P2 Le RAND

A0 88 00 00 10

This command will work ONLY if DF

GSM

or a sub-directory is selected,

and if cardholder veriﬁcation was performed.

The answer should be:

SW1 SW2

Where is the length of the response data that we will now recover

with GET RESPONSE command:

GET RESPONSE

CLA INS P1 P2 Le

A0 C0 00 00

The answer should now be split as 4+8+2:

Here SRES = = A3(Ki,RAND) and

Kc= = A8(Ki,RAND)

Starting from now, SRES will be sent to the base station, and the phone

conversation will be encrypted using A5/x algorithm with key Kc.

Nicolas T. Courtois 2009-10

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Classic Electronics Smart 4F Especificaciones Pagina 34