[Cryptography] De-Anonymizing

Henry Baker hbaker1 at pipeline.com
Sun Feb 1 19:33:17 EST 2015


At 07:59 PM 1/31/2015, John Gilmore wrote:
>The classic way to do this is to swap cards with other people who
>you happen to meet while waiting in line at the cash register.  Not
>only do you point out to them how any card will do, and how the
>retailer never told them that the whole point of the cards was to
>track them, but you will 'mix' with people you never saw before and
>are likely to never see again.

At one of the local chain markets, if you don't have a loyalty
card, the checkout person will use his/hers, so you still get
the discount, even when you pay cash.  Clearly, the local store
management doesn't care for the corporate BS tracking program.



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