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proxmark3/client
iceman1001andClaude Opus 5 (1M context) 82783eae26 hf mf: decode the Hexact payload
Sectors 9 and 11 were printed raw and marked 'not decoded'.

 - remove the XOR keystream and print the ten eight byte records
 - check the eighteen record bytes that are XOR combinations of sector 0,
   sector 15 and the UID, plus three record to record ties
 - 'hf mf view --selftest' now covers the decoder, using a synthetic card
 - sector 15 marker compare ignores case, factory blanks were not matched
 - an all FF or all 00 payload is named, not decrypted
 - sector 15 block 2 is text on a blank, so only read a serial there when
   the first four bytes are not printable

Research. The remaining 58 payload bytes are issuer data and are printed
without interpretation.

Co-Authored-By: Claude Opus 5 (1M context)
2026-09-14 09:19:05 +02:00
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2026-08-29 17:42:29 +02:00
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2026-09-14 09:19:05 +02:00
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