gchq/CyberChef

Operation request: ISO14443 SmartCards algorithms (CRC16, BCC)

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#9 geöffnet am 29.11.2016

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Thank you for great tool!

It will be nice to see algorithms from ISO14443 and ISO13239 contactless smartcards standards.

  • CRC16_A Initial register 0x6363 or 0xC6C6 in reversed bit order. Polynomial is 0x1021 and no final XOR.
  • CRC16_B
  • BCC (Bit Count Check) — simple successively XOR-ing all bytes

I've made my own calculator for example https://hub.zhovner.com/tools/nfc/

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