Working with NFC and smart cards
summary
Explains how Android talks to NFC cards using ISO/IEC 7816-4 and EMV commands, showing real SELECT (A4), GET PROCESSING OPTIONS and READ RECORD exchanges and TLV parsing with a library; demonstrates a Kotlin/Java demo that connects to a Mastercard and performs a mocked GENERATE AC (outcome A/decline). Identifies two practical failures: a Java signed byte bug that drops record iteration and noisy terminals that resend selects, and recommends sanitized logging and unit tests for APDU byte handling.
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chapters (6)
- 0:00Introduction
- 7:02NFC protocols and Android
- 15:37EMV payment flow
- 23:45NFC app pitfalls
- 28:25NFC security testing
- 30:35Resources and closing
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