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by L von Ahn - Cited by 312

http://www.captcha.net/captcha_crypt.pdf

by J Tam - 2008 - Cited by 3

http://www.captcha.net/Breaking_Audio_CAPTCHAs.pdf

by R Gossweiler - Cited by 3

http://www.richgossweiler.com/projects/rotcaptcha/rotcaptcha.pdf

by G Mori - Cited by 203

http://www.cs.sfu.ca/~mori/research/papers/mori_cvpr03.pdf

by L von Ahn - Cited by 230

http://www.cs.cmu.edu/~biglou/captcha.pdf

Key Words: Hard AI Problems, Automated Turing Tests, CAPTCHA .... AI problem is useful, a captcha implies a win-win situation: either there is a way to ...

http://www.cs.cmu.edu/~mblum/research/pdf/captcha.pdf

by J Yan - Cited by 21

http://homepages.cs.ncl.ac.uk/jeff.yan/msn_draft.pdf

ral net solution for CAPTCHA-cracking of the EZ-Gimpy CAPTCHAs. ... Although CAPTCHA-cracking programs have improved significantly since the introduction of ...

http://www.cs.washington.edu/homes/fortuna/forDownload/projectProposal.pdf

Langford from Carnegie Mellon University, called it as CAPTCHA™ (Completely ... The CAPTCHA method is now used in big web sites such as the Yahoo! or ...

http://www.jucs.org/jucs_12_12/persian_arabic_baffletext_captcha/jucs_12_12_1783_1796_shahreza.pdf

by R Datta - Cited by 22

http://infolab.stanford.edu/~wangz/project/imsearch/IMAGINATION/ACM05/datta.pdf

by J Windle - Related articles

http://faculty.gvsu.edu/aboufade/web/cmj101-108.pdf

by KA Kluever - 2009 - Related articles

http://cups.cs.cmu.edu/soups/2009/proceedings/a14-kluever.pdf

Collage CAPTCHA. In this method some shapes are ... Collage CAPTCHA [2] which is designed by authors. .... Collage CAPTCHA method with some differences. ...

http://ieeexplore.ieee.org/iel5/4492437/4492438/04492674.pdf?arnumber=4492674

the suggested CAPTCHA is composed of English alphabets that are picked randomly and written with ... A CAPTCHA can have various applications; it can be used ...

http://ieeexplore.ieee.org/iel5/4036509/4036510/04036650.pdf?arnumber=4036650

by P Faymonville - Related articles

http://vision.ucsd.edu/sites/default/files/soylentgrid.pdf

by P Faymonville - Related articles

http://vision.ucsd.edu/sites/default/files/soylentgrid-abstract_0.pdf

by HS Baird - 2005 - Cited by 29

http://www.cse.lehigh.edu/~baird/Pubs/scattertype.pdf

- Related articles

http://www.cse.lehigh.edu/~syw2/ICDAR05_CAPTCHA.pdf

4 Apr 2009 ... solve the CAPTCHA tests. Only humans can type in the right code and continue ... using a CAPTCHA, only humans can enter comments on a blog. ...

http://scscc.com/bkk/CAPTCHA- Humans vs Robots.pdf

Read and understand literature on breaking visual CAPTCHAs. • Coordinate and cooperate with ... Develop a block in the CAPTCHA-breaking software pipeline ...

http://www.nt.uni-saarland.de/education/SeminarWS06-07/Captcha.06-07.Intro.pdf

We present Asirra (Figure 1), a CAPTCHA that asks users to iden- .... of using Asirra much more enjoyable than a text-based CAPTCHA ...

http://sawoy.mylivepage.com/files/Asirra - A CAPTCHA that Exploits Interest-Aligned Manual Image Categorization.pdf

by R Simha - Cited by 4

http://www.seas.gwu.edu/~poorvi/CaptchasWOTE07.pdf

CAPTCHA stands for “Completely Automated Public Turing Test to Tell ... CAPTCHA is a test that can judge that it is interacting with genius human or ...

http://asrl.debii.curtin.edu.au/papers/How CAPTCHA annoys genuine users.pdf

or CAPTCHA's. CAPTCHA challenges exploit gaps in the perceptual abilities ... Moreover, we must face the unavoidable conundrum that any CAPTCHA can ...

http://www.springerlink.com/index/W5570VY4VFTEYL2V.pdf

CAPTCHA challenges. In this paper we use handwritten word images ... Fig. 1. Example of interface and handwritten CAPTCHA to confirm registration ...

http://www.springerlink.com/index/hgjh22y8qqlk9guk.pdf

12 Dec 2009 ... An introduction to developing secure CAPTCHA (Completely Automated Public ... The basis for a strong text based CAPTCHA is ensuring that ...

http://bitland.net/captcha.pdf

by W Daher - 2008 - Related articles

http://groups.csail.mit.edu/cis/theses/daher-masters.pdf

by K Chellapilla - Cited by 54

http://research.microsoft.com/en-us/um/people/kumarc/pubs/chellapilla_nips04.pdf

by R Halprin - Related articles

http://www.wisdom.weizmann.ac.il/~neko/DepCAPTCHA.pdf

by M Dailey - 2004 - Cited by 5

http://www.cs.ait.ac.th/~mdailey/captcha/dailey-namprempre.pdf

tagging as a CAPTCHA task. Our initial results indicate that the usability and security of our video CAPTCHA is comparable to that of existing text-based ...

http://www.cis.rit.edu/files/2597_RichardZanibbi_abstract1.pdf

by I Tehran - Related articles

http://ce.sharif.edu/~movaghar/icnsc07.pdf

by P Golle - 2008 - Cited by 16

http://eprint.iacr.org/2008/126.pdf

For a computer to beat a CAPTCHA, it must identify which ... system to break a particular CAPTCHA that can be found on captchas.net. Procedure and Methods ...

http://www.tjhsst.edu/~rlatimer/techlab08/CaiPosterQ4-08.pdf

CAPTCHA works by presenting an image of a word that has been distorted and ... and Yahoo are now preventing this by putting a CAPTCHA style question in ...

http://plus.maths.org/issue24/news/captcha/2pdf/index.html/op.pdf

This work focuses on development of an alternative aural CAPTCHA technology ... perception tasks, (2) as a side effect of CAPTCHA use, collect meaning data, ...

http://www.go2myspace.com/www.lti.cs.cmu.edu/Research/Tech Reports/CMU-LTI-07-014 A Dual-Use Speech CAPTCHA - Aiding Visually Impaired Web Users While Providing Transcription of Audio Streams.pdf

CAPTCHA (Completely. Automated Public Turing Test to Tell Computers ... Handwritten CAPTCHA: Using the. Difference in the Abilities of Humans and ...

http://sts.dhp.ks.edu.tw/andy/2006TANET/F00010.pdf

creasing the number of letters in the CAPTCHA while using the expanded letter domain. ... accuracy, shows that the true difficulty in CAPTCHA ...

http://www.cs.ou.edu/~amy/courses/cs5033_fall2008/Tidwell_Shadoan.pdf

by A Bansal - Related articles

http://www.rimtengg.com/coit2008/proceedings/IP15.pdf

signup, then you may want to also enable CAPTCHA. ... When CAPTCHA is enabled, visitors will need to recognise a distorted picture of a word (see example ...

http://www.atlassian.com/software/jira/docs/v3.13.2/public_signup.pdf

by IF Ince - 2008 - Cited by 1

http://pearl.cs.pusan.ac.kr/publication/Furkan2008ICCIT.pdf

by J Holman - 2007 - Cited by 16

http://www.towson.edu/main/research/researchhighlights/documents/Holman_assets_CAPTCHA.pdf

by J Yan - 2008 - Cited by 23

http://flyer.sis.smu.edu.sg/srg/[CCS08] A low-cost attack on a Microsoft captcha.pdf

D-Link has decided to add the CAPTCHA method of protection. ... have taken the initiative to implement CAPTCHA into our routers, thus providing yet another ...

http://gadgets.softpedia.com/newsPDF/D-Link-Adds-CAPTCHA-to-Its-Routers-2850.pdf

It began with a simple introduction and explanation of the CAPTCHA ... One of the ways to really prevent error in the CAPTCHA detection is making sure ...

http://cam.mathlab.stthomas.edu/pdf/final_project/2009/CAPTCHA_Final.pdf

by M Egelethe attacker slips CAPTCHA challenges into the web browsing ses- sions of unsuspecting victims, ... that CAPTCHA smuggling attacks are feasible in practice. ...

http://www.iseclab.org/papers/manuel-captcha.pdf

users since they are already willing to use a CAPTCHA to perform some particular task. .... CAPTCHA must not rely on any privacy of data or code to ...

http://www.aaai.org/Papers/AAAI/2007/AAAI07-209.pdf

tions identified while reverse engineering the captcha. Our contributions include: ... A general methodology for reverse engineering a captcha is ...

http://swag.uwaterloo.ca/~ahindle/pubs/hindle08wcre.pdf

by RV Hall Jr - Related articles

http://www.richhall.com/captcha/captcha_20051217.pdf

Captcha. Darko Obradovic. DFKI GmbH. Kaiserslautern.pm http://www.dfki.uni-kl.de/~obradovic ... chance to solve a captcha by guessing should be less than 1% ...

http://kaiserslautern.pm.org/downloads/objective-captcha.pdf