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I have a ReinerSCT Cyberjack Standard which I am not using as chipcard reader. I am wondering if it is possible to use it instead as HID device - a keyboard consisting mainly of numbers?

First I thought that this is not possible due to security reasons: I expect that the device does not transmit keypresses via the cable to the PC because the PIN could easily be sniffed then. But then I found the tool pcsc-cyberjack. Its README states:

The function rsct_setkeycb has been added to specify a callback to signal keypresses. The function specified in the second parameter is called whenever a C4 or F4 S-block is received from the reader.

Unfortunately I find no explanation for "C4 or F4 S-block". Does anybody know what I'll see after installing the driver and using this function rsct_setkeycb?

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