[Noisebridge-discuss] clipper card hacking

[Christie Dudley]

I don't feel like I can ethically hack these, having recently worked
for the company.  I can explain a little bit, but probably not a lot
more than you can find out for yourselves.

I'm interested, however, in hacking another protocol that the EFF and
ACLU are interested in hacking a new active RFID protocol that they're
currently using on head start kids.  I have a few people thinking
about it already, and there's a good chance we can get equipment
loaned to us to hack.

The protocol is still quite new.  ISO 24730-5 was only ratified in
April of this year.  The Chirp Spread Spectrum bit encoding is pretty
neat in that the encoding itself can be used to measure distance to
the source.

Christie
_______
But wait... there's no FCC on the moon!



On Tue, Oct 5, 2010 at 11:51 AM, Bryan Beeley <bryan at beeley.org> wrote:
> I was commuting using the Clipper/Translink card for a while, and I was
> able to get it to work almost every time, as long as I was paying
> attention.  It is just very particular about the way that you present
> the card to the reader.
>
> I would be interested in working with others on understanding the card.
> I also have software experience, and a fair amount of experience with
> hardware credentials and readers.  However, my experience with building
> custom hardware is fairly limited.
>
> Bryan
>
> On 10/04/2010 10:51 PM, Jonathan Lassoff wrote:
>> On Mon, Oct 4, 2010 at 9:28 PM, Ryan Rawson<ryanobjc at gmail.com>  wrote:
>>
>>> It does seem that some swipes take longer than others, perhaps as low
>>> as 300-500ms.
>>>
>>> Why would anyone build a high volume transit system based on this?
>>>
>> Personally, I find Clipper/Translink pretty unusable. In the times
>> that I've tried to use it, it usually takes 1-2 seconds and 2-3 tries
>> before it successfully tags.
>>
>> I bummed that Muni is canceling their beautifully colored passes and
>> forcing people that want them to carry around RF cards. I liked being
>> able to collect the colored passes for posterity.
>> Now that I've started biking more, I've basically given up on Muni as a result.
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