simtrac hw

[Harald Welte]

this is quite basic smartcard terminology.

a smart card reader is the master, it drives the clock, reset lines and issues commands to rhe card.

the card is a slave to the clock and reset lines. on a protocol level, it only responds to commands by the reader.

see iso 7816-3 for details on this. asynchronous t=0 is the predominant protocol used in sim cards.

a sniffer just passively listens to the communication between card and reader.
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Sent from a mobile device, excuse my short response