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I have two NFC readers, reader A reads card ID numbers according to the ISO standard and the algorithm is publicly available. Reader B is from a Canon printer. The card numbers read by reader B are 1.52 times larger than those read by reader A for the same card.

Is there a genius who can help me figure out the encryption algorithm of the NFC reader B?


Here are some card data for reference.


card1: reader A:0565932061 reader B:0863528701

card2: readerA:0100347102 readerB:0153111486

card3: readerA:1816830668 readerB:2772241676

card4: readerA:1530064599 readerB:2363059447

card5: readerA:3783796822 readerB:5773610326


my card is standard mifare m1 card. reader B is from cannon c5560i printer. According to the ISO14443-a standard:The first four bytes of my card is 1D 70 BB 21, reversing the orde gives 21 BB 70 1D which is the value 565932061 in decimal.

so: reader A:0565932061 :ISO standard

reader B:0863528701 :unknown

As you can see the value B shows is approximately 1.52 times more,So I think it's possible to find an algorithm compared to those with irregular encryption.

Who can help me figure out the encryption algorithm of the NFC reader B?

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