Quite a lot of work invested into reverse engineering a ticket information system and the encryption used. And there's privacy issues uncovered.

Reversing UK mobile rail tickets
https://eta.st/2023/01/31/rail-tickets.html

"But what data is inside the barcode of a mobile ticket, and how do they work? Could people who aren’t ticket inspectors get the data out of them? It turns out that the answer is a bit more interesting than I initially expected!"

#app #reverse_engineering #rail_ticket #uk #cryptography #rsa