[willvarfar]

I once heard of some fancy data science that inferred that the company was the supplier's major customer from the gaps in the sequential ids they saw when using that supplier's API. That was useful in negotiations.

And so the company that did that data science realised they too were susceptible to exactly the same 'attack'. So they created a system to obscure the ids they were themselves exposing to their customers, using some cheap cut-down tea64 encryption iirc. My memory is it never went live, though.

[theluketaylor]

Not that fancy (or at least not that novel). In WWII the allies used sequential serial numbers on destroyed and captured tanks to have a frighteningly accurate picture of German industrial output.

https://en.wikipedia.org/wiki/German_tank_problem