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Oyster card hack
On 22 Jul, 13:39, " wrote:
It depends on whether all the card transmits to the gate is the serial number or whether it includes some extra information - e.g. last gate to have gone through and whether that can be checked by the central system. I've not looked into how oyster works at all - I don't know whether the gates rely on a real time connection to the central system or not. The card has its own memory and enough information onboard that it can be authorised/charged/whatever without checking any central databases. Ticket barriers are online (i.e. have a live network connection) but it would be impractical for them to check a central database during every touch. Bus ticket machines are offline and rely on nightly downloads at the depot. Not sure about standalone validators and other edge cases. I wasn't considering reading it from more than an inch away. That's why I said a crowded station. If you need to read a card then you just stand near to the exit gates and watch until you see someone pass though and then stick the card in an easily accessible point. You then "accidentally" bump them. Now you've got whatever information the gate was expecting to see on the next trip. I think it's been demonstrated that passive cards (like Oyster) can be read from at least a few feet away with the right equipment. U -- http://londonconnections.blogspot.com/ A blog about transport projects in London |
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