3129 numbers that unlock keyless entry cars (2004)

http://everything2.com/index.pl?node_id=1520430&displaytype=printable

by AndyBaker • 12 years ago

14 11 12 years ago

Neat analysis. Do keyless entry cars not have some kind of "too many presses" sensor that would slow this process down or render it impossible by making you start over? I don't know, I'm just asking.

logfromblammo4• 12 years ago

Given the huge security holes already known to be present in the median auto electronics system, my guess is "absolutely not".

There may be some additional consideration for luxury-branded models, but for the standard models, the consideration is primarily whether it works for the auto-buyer every time, not how this could be used as an attack vector.

mkhalil• 12 years ago

"Given the huge security holes already known to be present in the median auto electronics system"

Would you mind listing some?

bradleyland3• 12 years ago

That’s awfully cynical. It also happens to be completely wrong. I extracted the following form a horrible Answers.com FAQ that was spread over 75 slides (barf):

"If the wrong code has been entered 7 times (35 consecutive button presses), the keypad will go into an anti-scan mode. This mode disables the keypad for one minute and the keypad lamp will flash. The anti-scan feature will turn off after one minute of keypad inactivity."

The Ford Explorer is hardly a “luxury-branded model”, and I’d venture that Ford uses this same system on all their models, across brands.

dale386• 12 years ago

I give it a week before someone creates a lego mindstorm / arduino device with suction cups that performs the entire sequence in much less than 20min.

michaelt• 12 years ago

Some electric door locks (like the Codoor CD3500 [1] used at a place I used to work) are designed so after a certain number of digits without a valid code (16 for the codoor), they require the correct code to be entered twice in succession in order to unlock.

This is transparent to the user - it's just as if you hit a wrong button - but prevents using codes like this.

I don't know if this is common to all keyless entry systems, but you'd hope it would be!

Of course you can still enter every every code, just it would take 80,000 button presses on a 10-digit lock.

[1] http://www.assar.ee/cgi-bin/document.cgi?doc=356 see page 12 'access blocking'

3129 numbers that unlock keyless entry cars (2004)

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