Reverse DNS queries may reveal too much, computer scientists argue
"We view this as a serious problem that may very well be in a blind spot of network operators," explained Mattijs Jonker, assistant professor at University of Twente's Faculty of Electrical Engineering, Mathematics and Computer Science , in an email to"First, the practice of dynamically adding records when devices join and leave a network offers a path for miscreants to remotely learn network dynamics and internals, even if traditional mechanisms to stop tracking by outsiders...
To demonstrate how individuals can be tracked, the researchers used rDNS data to follow one or more individuals named Brian around a US university network over a six-week period. The rDNS queries yielded hostnames like brians-air, brians-galaxy-note9, brians-ipad, brians-mbp, and brians-phone. Because the Galaxy Note 9 appeared for the first time on Monday afternoon after the US Thanksgiving holiday, they speculate that one these Brians bought the device at a sale on the Friday after the holiday or on that day.
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