KDE PIM/KItinerary/vr.fi Barcode: Difference between revisions
< KDE PIM | KItinerary
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..." |
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! Byte[:Bit] (MSB) !! Content !! Meaning !! Notes | ! Byte[:Bit] (MSB) !! Content !! Meaning !! Notes | ||
|- | |- | ||
| 0 - | | 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 |