Solving CAPTCHA A study for testing the security of CAPTCHA

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dc.contributor.authorDanielsson, Anton
dc.contributor.authorHusnjak, Filip
dc.contributor.authorLindgren, Linus
dc.contributor.authorEriksson, Isak
dc.contributor.authorWållgren, Patrik
dc.contributor.authorLarsson, Björn
dc.contributor.departmentChalmers tekniska högskola / Institutionen för data- och informationsteknik (Chalmers)sv
dc.contributor.departmentChalmers University of Technology / Department of Computer Science and Engineering (Chalmers)en
dc.date.accessioned2019-07-03T13:30:54Z
dc.date.available2019-07-03T13:30:54Z
dc.date.issued2014
dc.description.abstractThe aim of this study is to create a computer application that can solve as many CAPTCHAs as possible. CAPTCHA is a security measure on the internet that stops automated programs from collection of sensitive information, cheating on online polls and spamming among other things. Given the amount of websites that depend on CAPTCHA as a security measure it is important to see whether or not it is possible to solve these under a rather short time frame. This project was done as an experimental study with a basis on previous attempts that have been published. The reports and ideas that other people have used are gone through and implemented together with new ideas. The main findings are that the noise protection, given to almost every CAPTCHA today, is not as safe as presumed as it is relatively easy for a computer to remove. The hardest part in a CAPTCHA for a computer to solve is the segmentation, which was not really solved in this project. Characters that are “fused” together are hard to segment from each other into single characters, which mean that the character recognition cannot recognise the characters. It was concluded that the CAPTCHAs are still a very safe way of protecting the websites from automated robots.
dc.identifier.urihttps://hdl.handle.net/20.500.12380/203116
dc.language.isoeng
dc.setspec.uppsokTechnology
dc.subjectData- och informationsvetenskap
dc.subjectComputer and Information Science
dc.titleSolving CAPTCHA A study for testing the security of CAPTCHA
dc.type.degreeExamensarbete för kandidatexamensv
dc.type.degreeBachelor Thesisen
dc.type.uppsokM2
local.programmeDatateknik 300 hp (civilingenjör)
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Examensarbeten för kandidatexamen