{"id":13268,"date":"2021-12-08T20:32:15","date_gmt":"2021-12-09T01:32:15","guid":{"rendered":"https:\/\/carleton.ca\/scs\/?page_id=13268"},"modified":"2021-12-08T20:34:03","modified_gmt":"2021-12-09T01:34:03","slug":"tr-08-15-on-purely-automated-attacks-and-click-based-graphical-passwords","status":"publish","type":"page","link":"https:\/\/carleton.ca\/scs\/research\/scs-technical-reports\/technical-reports-2008\/tr-08-15-on-purely-automated-attacks-and-click-based-graphical-passwords\/","title":{"rendered":"TR-08-15: On Purely Automated Attacks and Click-Based Graphical Passwords"},"content":{"rendered":"

Carleton University
\nTechnical Report<\/a> TR-08-15
\nJune 20, 2008<\/p>\n

On Purely Automated Attacks and Click-Based Graphical Passwords<\/h2>\n
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Amirali Salehi-Abari, Julie Thorpe, P.C. van Oorschot<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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Abstract<\/h3>\n

We present and evaluate various methods for purely automated attacks against click-based graphical passwords. Our purely automated methods combine click-order heuristics with focus-of-attention scan-paths generated from Itti et al.’s (1998) computational model of visual attention. Testing our method against previous work, it results in a significantly better automated attack, guessing 8-15% of passwords for two representative images using dictionaries of less than 2**24.6 entries, and about 16% of passwords on each of these images using dictionaries of less than 2**31.4 entries (where the full password space is 43 bits). Relaxing our click-order pattern substantially increased the efficacy of our attack albeit with larger dictionaries, allowing attacks that guessed 48-54% of passwords in less than 2**35 guesses (compared to previous results of 0.9% and 9.1% on the same two images with 2**35 guesses). These latter automated attacks are independent of focus-of-attention models, and in fact are based on image-independent guessing patterns. Our results show that automated attacks, which are easier to launch than human-seeded attacks and are more scalable to systems that use multiple images, pose a significant threat to PassPoints-style graphical passwords, and offer an effective alternative to human-seeded attacks.<\/p>\n

TR-08-15.pdf<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Carleton University Technical Report TR-08-15 June 20, 2008 On Purely Automated Attacks and Click-Based Graphical Passwords Amirali Salehi-Abari, Julie Thorpe, P.C. van Oorschot Abstract We present and evaluate various methods for purely automated attacks against click-based graphical passwords. Our purely automated methods combine click-order heuristics with focus-of-attention scan-paths generated from Itti et al.’s (1998) computational […]<\/p>\n","protected":false},"author":49,"featured_media":0,"parent":12410,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_relevanssi_hide_post":"","_relevanssi_hide_content":"","_relevanssi_pin_for_all":"","_relevanssi_pin_keywords":"","_relevanssi_unpin_keywords":"","_relevanssi_related_keywords":"","_relevanssi_related_include_ids":"","_relevanssi_related_exclude_ids":"","_relevanssi_related_no_append":"","_relevanssi_related_not_related":"","_relevanssi_related_posts":"","_relevanssi_noindex_reason":"","_mi_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":"","_links_to":"","_links_to_target":""},"yoast_head":"\nTR-08-15: On Purely Automated Attacks and Click-Based Graphical Passwords - School of Computer Science<\/title>\n<meta name=\"description\" content=\"Carleton University Technical Report TR-08-15 June 20, 2008 On Purely Automated Attacks and Click-Based Graphical Passwords Amirali Salehi-Abari, Julie\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/carleton.ca\/scs\/research\/scs-technical-reports\/technical-reports-2008\/tr-08-15-on-purely-automated-attacks-and-click-based-graphical-passwords\/\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/carleton.ca\/scs\/research\/scs-technical-reports\/technical-reports-2008\/tr-08-15-on-purely-automated-attacks-and-click-based-graphical-passwords\/\",\"url\":\"https:\/\/carleton.ca\/scs\/research\/scs-technical-reports\/technical-reports-2008\/tr-08-15-on-purely-automated-attacks-and-click-based-graphical-passwords\/\",\"name\":\"TR-08-15: On Purely Automated Attacks and Click-Based Graphical Passwords - 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