{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T18:49:36Z","timestamp":1790275776236,"version":"4.1.0"},"reference-count":0,"publisher":"Privacy Enhancing Technologies Symposium Advisory Board","issue":"2","license":[{"start":{"date-parts":[[2025,4,1]],"date-time":"2025-04-01T00:00:00Z","timestamp":1743465600000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["PoPETs"],"abstract":"<jats:p>Onion-Location makes it easy for websites offering onion service access to support automatic discovery in Tor Browser of the random-looking onion address associated with their domain. We provide the first measurement study of how many websites are currently using Onion-Location. We also describe the open-source tools we created to conduct the study. Onion-Location has been criticized elsewhere for its lack of transparency and vulnerability to blocking. Perhaps even more troubling, we show that Onion-Location is vulnerable to very accurate fingerprinting. We present recommended changes to and alternatives to Onion-Location as well as steps towards even more secure onion discovery and association.<\/jats:p>","DOI":"10.56553\/popets-2025-0074","type":"journal-article","created":{"date-parts":[[2025,3,7]],"date-time":"2025-03-07T23:36:18Z","timestamp":1741390578000},"page":"512-526","source":"Crossref","is-referenced-by-count":1,"title":["Onion-Location Measurements and Fingerprinting"],"prefix":"10.56553","volume":"2025","author":[{"given":"Paul","family":"Syverson","sequence":"first","affiliation":[{"name":"U.S. Naval Research Laboratory"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rasmus","family":"Dahlberg","sequence":"additional","affiliation":[{"name":"Independent"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tobias","family":"Pulls","sequence":"additional","affiliation":[{"name":"Karlstad University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rob","family":"Jansen","sequence":"additional","affiliation":[{"name":"U.S. Naval Research Laboratory"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"35752","published-online":{"date-parts":[[2025,4]]},"container-title":["Proceedings on Privacy Enhancing Technologies"],"original-title":[],"deposited":{"date-parts":[[2025,3,7]],"date-time":"2025-03-07T23:36:58Z","timestamp":1741390618000},"score":1,"resource":{"primary":{"URL":"https:\/\/petsymposium.org\/popets\/2025\/popets-2025-0074.php"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,4]]},"references-count":0,"journal-issue":{"issue":"2","published-online":{"date-parts":[[2025,4]]}},"alternative-id":["10.56553\/popets-2025-0074"],"URL":"https:\/\/doi.org\/10.56553\/popets-2025-0074","relation":{},"ISSN":["2299-0984"],"issn-type":[{"value":"2299-0984","type":"electronic"}],"subject":[],"published":{"date-parts":[[2025,4]]}}}