{"guid":"import-79b1beb3f18e5edc5a","title":"Hash-flooding DoS reloaded: attacks and defenses","subtitle":null,"slug":"29c3-5152-en-hashflooding_dos_reloaded_h264","link":"http://events.ccc.de/congress/2012/Fahrplan/events/5152.en.html","description":"At 28C3, Klink and Waelde showed that a number of technologies (PHP, ASP.NET,\nRuby, Java, Python, etc.) were vulnerable to the decade-old hash-flooding DoS\nattacks. The vulnerability was then often fixed by adopting stronger hash\nfunctions and \"randomizing\" them.\n","original_language":"eng","persons":["djb","Jean-Philippe Aumasson","Martin Boßlet"],"view_count":946,"promoted":false,"date":"2012-12-29T01:00:00.000+01:00","release_date":"2013-01-01T01:00:00.000+01:00","updated_at":"2026-02-06T19:15:09.949+01:00","tags":["29c3"],"length":3413,"duration":3413,"thumb_url":"https://static.media.ccc.de/media/congress/2012/29c3-5152-en-hashflooding_dos_reloaded_h264.jpg","poster_url":"https://static.media.ccc.de/media/congress/2012/29c3-5152-en-hashflooding_dos_reloaded_h264_preview.jpg","timeline_url":"https://static.media.ccc.de/media/congress/2012/import-79b1beb3f18e5edc5a-timeline.jpg","thumbnails_url":"https://static.media.ccc.de/media/congress/2012/import-79b1beb3f18e5edc5a-thumbnails.vtt","frontend_link":"https://media.ccc.de/v/29c3-5152-en-hashflooding_dos_reloaded_h264","url":"https://api.media.ccc.de/public/events/import-79b1beb3f18e5edc5a","conference_title":"29C3: Not my department","conference_url":"https://api.media.ccc.de/public/conferences/29c3","related":[{"event_id":1599,"event_guid":"import-0263d58196a112ebec","weight":4},{"event_id":1630,"event_guid":"import-196baee714b3785cfb","weight":2},{"event_id":1632,"event_guid":"import-0d984b8893f631f585","weight":3},{"event_id":1654,"event_guid":"import-efc946f94edef3de15","weight":2},{"event_id":1698,"event_guid":"import-8ea249dc923ddef614","weight":3},{"event_id":1711,"event_guid":"import-8381ce96744da065b9","weight":2},{"event_id":2175,"event_guid":"MghFmvDBS-J7T2ZOkNXUKA","weight":2},{"event_id":2230,"event_guid":"5gpaE5FLmfxMjTlbSDJkWw","weight":2},{"event_id":2554,"event_guid":"0030f6d6-8bc4-400c-a000-020ee1892bee","weight":3},{"event_id":2862,"event_guid":"2f4cd1ef-dd90-4145-a734-141e5c081940","weight":2},{"event_id":4844,"event_guid":"5c5e888e-4556-405b-a205-e59b97db99e1","weight":4}],"recordings":[{"size":259,"length":3413,"mime_type":"audio/mpeg","language":"eng","filename":"29c3-5152-en-hashflooding_dos_reloaded_mp3.mp3","state":"downloaded","folder":"mp3-audio-only","high_quality":true,"width":720,"height":576,"updated_at":"2014-05-10T15:27:00.528+02:00","recording_url":"https://cdn.media.ccc.de/congress/2012/mp3-audio-only/29c3-5152-en-hashflooding_dos_reloaded_mp3.mp3","url":"https://api.media.ccc.de/public/recordings/3406","event_url":"https://api.media.ccc.de/public/events/import-79b1beb3f18e5edc5a","conference_url":"https://api.media.ccc.de/public/conferences/29c3"},{"size":259,"length":3413,"mime_type":"video/mp4","language":"eng","filename":"29c3-5152-en-hashflooding_dos_reloaded_h264.mp4","state":"downloaded","folder":"mp4-h264-HQ","high_quality":true,"width":720,"height":576,"updated_at":"2016-01-27T11:03:55.241+01:00","recording_url":"https://cdn.media.ccc.de/congress/2012/mp4-h264-HQ/29c3-5152-en-hashflooding_dos_reloaded_h264.mp4","url":"https://api.media.ccc.de/public/recordings/3405","event_url":"https://api.media.ccc.de/public/events/import-79b1beb3f18e5edc5a","conference_url":"https://api.media.ccc.de/public/conferences/29c3"},{"size":259,"length":3413,"mime_type":"video/webm","language":"eng","filename":"29c3-5152-en-hashflooding_dos_reloaded_webm.webm","state":"downloaded","folder":"webm","high_quality":true,"width":720,"height":576,"updated_at":"2016-01-27T11:03:55.272+01:00","recording_url":"https://cdn.media.ccc.de/congress/2012/webm/29c3-5152-en-hashflooding_dos_reloaded_webm.webm","url":"https://api.media.ccc.de/public/recordings/3404","event_url":"https://api.media.ccc.de/public/events/import-79b1beb3f18e5edc5a","conference_url":"https://api.media.ccc.de/public/conferences/29c3"}]}