https://hackerpaper.kaipfister.de/p/1310.1137/Collected HN comments and submissions linking this paper.enMon, 02 Nov 2026 11:16:22 GMThttps://news.ycombinator.com/item?id=6551740urn:hackerpapers:mention:1310.1137:6551740Tue, 15 Oct 2013 06:07:37 GMT<p>The paper: http://arxiv.org/pdf/1310.1137v1.pdf Its thesis: &quot;We introduce GOTCHAs (Generating panOptic Turing Tests to Tell Computers and Humans Apart) as a way of preventing automated offline dictionary attacks against user selected passwords.&quot; It cites http://eprint.iacr.org/2006/276.pdf which it is an improvement upon. As far as I can tell from reading the papers, though it does not state this, the purpose is to make offline dictionary attacks harder by helping the users create/remember a higher amount of entropy than they do with a password.[1] Given ten images to be matched up with…</p><p><a href="https://hackerpaper.kaipfister.de/p/1310.1137/">Paper and discussion history</a>. A mention is not an endorsement.</p>cs.CR