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When the reader is at Security Level 4, a correctly executed Authentication Sequence is required before the reader sends out data for a card swipe. Commands that require security must be sent with a four byte Message Authentication Code (MAC) at the end. Note that data supplied to MAC algorithm should NOT be converted to ASCII-Hex, rather it should be supplied in its raw binary form. Calculating MAC requires knowledge of current DUKPT KSN, this could be retrieved using Get DUKPT KSN and Counter command.
See also:
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