(Created page with "= General Observations = * always exactly 107 byte * all binary, there are no recognizable ASCII strings in this * the last ~64 byte have very high entropy, suggesting a sign...")
 
(Bit Layout)
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! Byte[:Bit] (MSB) !! Content !! Meaning !! Notes
 
! Byte[:Bit] (MSB) !! Content !! Meaning !! Notes
 
|-
 
|-
| 0 - 106 || unknown || unknwon ||  
+
| 0 - 1 || 0b0001 0000 0b0000 0010 || unknown || fixed in all samples
 +
|-
 +
| 2 || 0b1010 0000 or 0b1000 0000 || unknown ||
 +
|-
 +
| 3 || 0b0000 0001 || unknown || fixed in all samples
 +
|-
 +
| 4:0 4:6 || null || ||
 +
|-
 +
| 4:7 - 5:7 || varying ||  || date?
 +
|-
 +
| 6 - 12 || 0x00 0x49 0x24 0x92 0x49 0x24 0x92 || || fixed in all samples, issuer id maybe?
 +
|-
 +
| 13 - 196 || todo || todo ||
 
|-
 
|-
 
|}
 
|}

Revision as of 16:52, 4 January 2020

General Observations

  • always exactly 107 byte
  • all binary, there are no recognizable ASCII strings in this
  • the last ~64 byte have very high entropy, suggesting a signature or a compressed section
  • there's a base64 encoded sequential number printed below the Aztec code on the ticket, containing 24bit.
  • one barcode seems to be exactly for one journey section

Bit Layout

Byte[:Bit] (MSB) Content Meaning Notes
0 - 1 0b0001 0000 0b0000 0010 unknown fixed in all samples
2 0b1010 0000 or 0b1000 0000 unknown
3 0b0000 0001 unknown fixed in all samples
4:0 4:6 null
4:7 - 5:7 varying date?
6 - 12 0x00 0x49 0x24 0x92 0x49 0x24 0x92 fixed in all samples, issuer id maybe?
13 - 196 todo todo

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