Hacking a parking ticket system
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Hacking a parking ticket system
1–10 of 65 posts
Re: Hacking a parking ticket system
#2I'm sure this will be a big hit with the legitimate purchasers of the tickets to which those barcodes were assigned... who will find them mysteriously invalid when presented.
Re: Hacking a parking ticket system
#3I'm sure this will be a big hit with the legitimate purchasers of the tickets to which those barcodes were assigned... who will find them mysteriously invalid when presented.
Correct, unless you manage to hop out of the range of the assigned ranges.
Re: Hacking a parking ticket system
#4Nice reasoning. How long did it take you to figure it out?
Re: Hacking a parking ticket system
#5Nice.
You have a typo here:
f(21) = (23 * 854) % 1000 = 17934 % 1000 = 934.
I wouldn't be surprised if the last four digits are some form of built-in barcode error checking, and are not used anywhere else.
Re: Hacking a parking ticket system
#6A really simple "hack" of a car park with an entry barrier that issues you a ticket is that you can usually exit the car park with an unpaid ticket if it's under 10 min old. So just get a new ticket from the entrance when you want to leave.
They do this so you can get out if there are no spaces.
I haven't done this myself and don't condone it. You will probably get in trouble and it's not nice.
Re: Hacking a parking ticket system
#7A really simple "hack" of a car park with an entry barrier that issues you a ticket is that you can usually exit the car park with an unpaid ticket if it's under 10 min old. So just get a new ticket from the entrance when you want to leave. They do this so you can get out if there are no spaces. I haven't done this myself and don't condone it. You will probably get in trouble and it's not nice.
And let's add the legal term for it here, so it's clear what this "hack" actually is: Fraud.
Re: Hacking a parking ticket system
#8A really simple "hack" of a car park with an entry barrier that issues you a ticket is that you can usually exit the car park with an unpaid ticket if it's under 10 min old. So just get a new ticket from the entrance when you want to leave. They do this so you can get out if there are no spaces. I haven't done this myself and don't condone it. You will probably get in trouble and it's not nice.
> So just get a new ticket from the entrance
Getting a new ticket from the printer before the barrier will be hard if your car is inside the car park. Often the ticket printer will only work if it notices a large metal object (such as a car) in front of the barrier.
Re: Hacking a parking ticket system
#9A really simple "hack" of a car park with an entry barrier that issues you a ticket is that you can usually exit the car park with an unpaid ticket if it's under 10 min old. So just get a new ticket from the entrance when you want to leave. They do this so you can get out if there are no spaces. I haven't done this myself and don't condone it. You will probably get in trouble and it's not nice.
> So just get a new ticket from the entrance Getting a new ticket from the printer before the barrier will be hard if your car is inside the car park. Often the ticket printer will only work if it notices a large metal object (such as a car) in front of the barrier.
Many automated garages ban motorcycles because they're unable to trigger the sensor.
Re: Hacking a parking ticket system
#10> I'm sure there's a bit more elegant way to find the missing thousand component, but for me it would be just quicker to do a bit of brute-forcing:
The calculation the author wants is
LastThreeDigits(secret*23) = 642
secret * 23 == 642 (mod 1000)
secret * 23 + dummy * 1000 = 642
other_secret * 23 + other_dummy * 1000 = 1
(But in this case, and with a computer, it's easier the brute force solution.)