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Re: [94attendees] walking-around cash suggestion?

Nat Sakimura <sakimura@gmail.com> Sat, 31 October 2015 02:19 UTC

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From: Nat Sakimura <sakimura@gmail.com>
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Date: Sat, 31 Oct 2015 07:49:01 +0530
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References: <09ED81E5-185E-4B94-8076-774C26495097@nominum.com> <m2bnbhi4e4.wl%randy@psg.com> <5632C667.2040901@sphericalcowgroup.com> <m21tcdi0nz.wl%randy@psg.com> <20151031014633.GA15484@laperouse.bortzmeyer.org> <m28u6jg5xh.wl%randy@psg.com>
To: Randy Bush <randy@psg.com>
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Cc: Stephane Bortzmeyer <bortzmeyer+ietf@nic.fr>, 94attendees@ietf.org, Benn Oshrin <benno@sphericalcowgroup.com>
Subject: Re: [94attendees] walking-around cash suggestion?
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Unregistered Suica would not directly link to you but studies show that only with three train transactions, I.e, getting in the station, getting out, and getting in, you are now singled out among the entire set of transaction. If there are matching auxiliary data such as you uploading photo with gps data, you would be reasonably linked to the Suica data. 

=nat via iPhone

2015/10/31 7:22、Randy Bush <randy@psg.com> のメッセージ:

>> Is there a privacy assesment of Suica cards somewhere? When I bought
>> mine, the clerk did not ask anything (ID or something like that) and I
>> refill it with cash so I assume I can use it "anonymously"?
> 
> i consider it to have a strong identity which is not directly tied to my
> real world person but probably can be (think surveillance cameras etc.)
> 
> randy
> 
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