This has been happening to me at local restaurants. Is it based on credit card numbers (which I thought was illegal), some app I’m not aware of, or some nasty cellphone tracking thing?https://twitter.com/snubs/status/1001481921094828032?s=21 …
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Replying to @haroldsmith3rd @matthew_d_green
BTW the hash of a CC does not anonymize it, because the ~10^16 phase space of CC numbers is too small, thus a rainbow table is trivial.
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It’s considerably smaller than 10^16, as the numbers have lots of internal structure
8:15 AM - 30 May 2018
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