KDE PIM/KItinerary/vr.fi Barcode
- 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.
- there's a 13 digit order number and optionally a 15 digit reference number on each ticket, sequential and covering multiple sections/travelers
- one barcode seems to be exactly for one journey section
- all available samples are for a single adult traveler, and for second class
|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|
|4:7 - 5:7||9 bit uint||day of travel||counted from Jan 1|
|6 - 13:1||0x00 0x49 0x24 0x92 0x49 0x24 0x92 0b00||fixed in all samples, patterns repeats below|
|13:2 - 16:7||5 x 6bit||departure station||see below|
|17:1 - 20:6||5 x 6bit||arrival station||see below|
|20:7 - 21:7||todo||todo|
|22:0 - 23:5||14 bit uint||train number||might be including too many/few leading 0 bits, 0 for buses|
|23:6 - 25:3||null|
|25:4 - 28:7||todo||todo|
|29||0b0010 0000||fixed in all samples|
|30:0 - 30:5||6 bit uint||coach number||leading 0 bits uncertain|
|30:6 - 31:4||7 bit uint||seat number||0 if no seat reserved|
|31:5 - 31:7||0b100||fixed in all samples|
|32 - 40||0x89 0x24 0x92 0x49 0x24 0x90 0x60 0x00 0x01||fixed in all samples, repeats a pattern from 6-12|
|41:0 - 42:0||todo||todo||varies slightly between samples|
|42:1 - 106:0||64 byte varying||high entropy in all samples, signature?|
|106:1 - 106:7||0x00 or 0x80|
- Using 2-4 characters long alphabetical codes from https://rata.digitraffic.fi/api/v1/metadata/stations, Wikidata has those codes as untyped P296 properties
- Values are encoded as a six bit number per character. Adding 55 to that number results in the corresponding ASCII code, which would suggest values 0-9 are reserved for digits. The value 36 (']' by that rule) is used to mark an unset character (for codes shorter than 5 characters).
- The official table also uses the 'Ä' and 'Ö' characters, it's unclear how those would be encoded here though.
This page was last edited on 1 April 2020, at 14:47. Content is available under Creative Commons License SA 4.0 unless otherwise noted.