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

I would be more worried if you are using a BTLE device eg: FitBit or have BT enabled on a phone/device(s).  It’s one of the easiest ways to be tracked that people generally don’t appreciate.

http://www.businessinsider.com/senator-warns-fitbit-is-a-privacy-nightmare-2014-8

This isn’t meant to single out Fitbit, but more to speak of the people likely coming to IETF carry a lot more electronics on average that makes them more likely to make an opsec mistake or just be easy to ID you.

Regarding the OP questions:

1) I come back to japan periodically, so usually put my remaining cash on my SUICA card so I don’t misplace it.  You can also cash our your SUICA card.  This can be useful to convert your coins to larger bills if you plan to change them back to your primary currency. I usually keep the 1Y coins for the kids.

2) I find that 10,000-20,000 to be the right amount of cash to have, unless you are going to a more expensive place with a large group. I would always be prepared to pay in cash.

3) When you check out of the hotel (please do this and don’t just leave your key in the room) don’t be surprised to see locals paying for their room in cash.

- Jared

> On Oct 30, 2015, at 10:19 PM, Nat Sakimura <sakimura@gmail.com> wrote:
> 
> 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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