ISO7816-3 standard for Smart Card states that some cards is not obliged to support character repetition (due to parity error). Now let's say interface device (ID) receives parity error data from the unknown card during ATR (answer to reset). It (ID) signals the error to the card, but knowing nothing about if card supports repetition, how can it determine whether next character from the card is repeated one (that had parity error) or next one (in case the card doesn't support repetition).
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As far as I understand the standard, the error detection works in the following way:
for
T=0the error signal and character repetition is usedfor the others there is always a frame checksum which is used for error detection (
TCKbyte in Answer-to-reset,LRC/CRCinT=1frames)Citing ISO/IEC 7816-3:2006, section "Answer to reset", subsection "Characters and coding conventions":
Citing subsection "Check byte TCK" under section "Answer-to-Reset":
The above means that the correct transmission of ATR is checked by error signal/character repetition for pure
T=0cards. And byTCKbyte for the rest.In your scenario the interface device really cannot distinguish repeated character from the not-repeated one after parity error, but in case the card does not support error signal/character repetition the resulting
TCKbyte (which is mandatory in this case) should be wrong with a high probability.Disclaimer: This is my interpretation of the standard, please do validate my thoughts...
Good luck!