KDE PIM/KItinerary/MAV Barcode: Difference between revisions

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Line 35: Line 35:
| 84 || 4 || uint32 || passenger birth date || year * 10000 + month * 100 + day
| 84 || 4 || uint32 || passenger birth date || year * 10000 + month * 100 + day
|-
|-
| 88 || 128 || ? || ? ||
| 88 || 19 || ? || ? ||
|-
| 107 || 3 || uint24 || UIC departure station code || including the national prefix ('55' for HU)
|-
| 110 || 3 || uint24 || UIC arrival station code ||
|-
| 113 || 100 || ? || ?
|-
|-
| 216 || 17 || ? || ? || bytes 216 and following are only present on tickets with seat reservations
| 216 || 17 || ? || ? || bytes 216 and following are only present on tickets with seat reservations

Revision as of 10:51, 21 August 2021

General Observation

  • Uses PDF417 barcode format.
  • Variable length.
  • For domestic tickets only.
  • No similarities with a known ERA format.

Outer Structure

  • Two byte header, fixed 0x0403.
  • Gzip-compressed payload using deflate compression, starting with the standard Gzip header 0x1f8b0800000000000000.
  • 256 remaining bytes, high entropy and length suggest a cryptographic signature.

Payload Structure

Note: this is based on very few samples so far and thus isn't very reliable yet!

  • Seems byte- rather than bit-aligned.
  • String encoding is UTF-8.
  • Number encoding seems big endian.
  • Variable length, observed between 217 and 274 bytes.
  • Content has a high amount of null bytes.

Layout

Offset Size Data Type Meaning Notes
0 17 string ticket number printed as "CIV" on the PDF, numeric
17 22 ? ?
39 45 string passenger name null terminated
84 4 uint32 passenger birth date year * 10000 + month * 100 + day
88 19 ? ?
107 3 uint24 UIC departure station code including the national prefix ('55' for HU)
110 3 uint24 UIC arrival station code
113 100 ? ?
216 17 ? ? bytes 216 and following are only present on tickets with seat reservations
233 5 string train number null-terminated
238 2 ? coach number? numeric or string encoding, too few samples to be sure
240 6 numeric seat number? too few samples to be sure
246 28 null ? null bytes in all samples

Missing/Suspected Information

  • Station names are not included, but station codes might be. UIC station numbers (possibly without the country prefix) would be the obvious suspect, given the MÁV website uses those as well.
  • If the train number is included, one would expect at least the day of travel to be included as well.
  • Class: several candidate locations exist, but given it's small footprint we need a lot more samples to confirm one of those.