New answers tagged decryption
1
It looks like this is a custom CRC in which the initial value of the algorithm depends on the first byte of the message.
These parameters stay consistent for all messages:
Polynomial = 0x1d
Input Reflected = False
Result Reflected = False
Final Xor Value = 0x00
But the initial value depends on the first byte:
0x00: init = 0x7a
0x51: init = 0x3a
0x71: ...
0
Based on a few samples, here is an overview of some fields that can be read in clear.
Source: https://github.com/fproulx/tastybits/blob/master/NOTES.md
Datasets: https://github.com/fproulx/tastybits/tree/master/sample-data
Unofficial specification
PDF417 barcode with BASE64 encoded binary payload
Always 0x7A bytes long == 122 bytes == 976 bits
...
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