CAPTCHA Security Broken


	CAPTCHA Security Broken
rj3sp
1-31-2008 11:22 AM
479 views
tags:
captcha
rj3sp says:
According to a blog post by a Russian security researcher the CAPTCHA system used by Yahoo! may have been compromised.
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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/61288d5f-bcfd-49e0-bafd-23b564db305b/1FD4ACE5-3F8F-4613-AFAD-51400AC742A4/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.techlivez.com/2007/04/new-security-technology-which-doesnthtml/" href="http://www.techlivez.com/2007/04/new-security-technology-which-doesnthtml/" style="font-size: 11px;">www.techlivez.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.techlivez.com/2007/04/new-security-technology-which-doesnthtml/"><H1 class="entry-header"><A title="CAPTCHA Security Broken- Delight For Spammers" rel="bookmark" href="http://www.techlivez.com/2008/01/captcha-security-broken-delight-for-spammers/">
    CAPTCHA Security Broken- Delight For Spammers    </A></H1></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.techlivez.com/2007/04/new-security-technology-which-doesnthtml/"><div align="center"><img src="http://content7.clipmarks.com/blog_cache/www.techlivez.com/img/E263926C-708B-4BFC-B5C5-A3FD8B46E509" alt="broken-captcha" /></div></blockquote><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content8.clipmarks.com/images/clip-icon.gif" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://en.wikipedia.org/w/index.php?title=CAPTCHA&oldid=188057612" href="http://en.wikipedia.org/w/index.php?title=CAPTCHA&oldid=188057612" style="font-size: 11px;">en.wikipedia.org</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://en.wikipedia.org/w/index.php?title=CAPTCHA&oldid=188057612"><div align="center"><img src="http://content9.clipmarks.com/blog_cache/en.wikipedia.org/img/3703FF12-ED21-4EA3-BF9B-C7BD6D01D56C" alt="Early CAPTCHAs such as these, generated by the EZ-Gimpy program, were used on Yahoo. However, technology was developed to read this type of CAPTCHA." /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://en.wikipedia.org/w/index.php?title=CAPTCHA&oldid=188057612"><DIV class="thumbcaption">
<DIV class="magnify"><A title="Enlarge" class="internal" href="http://en.wikipedia.org/wiki/Image:Captcha.jpg"><IMG width="15" height="11" alt="" src="http://en.wikipedia.org/skins-1.5/common/images/magnify-clip.png" /></A></DIV>
Early CAPTCHAs such as these, generated by the EZ-Gimpy program, were used on Yahoo. However, technology was developed to read this type of CAPTCHA<SUP class="reference" id="_ref-0"><A title="" href="#_note-0">[1]</A></SUP>.</DIV></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://en.wikipedia.org/w/index.php?title=CAPTCHA&oldid=188057612"><div align="center"><img src="http://content6.clipmarks.com/blog_cache/en.wikipedia.org/img/44C3AB87-177C-4A5F-BE5A-03EC0F27A589" alt="A modern CAPTCHA. Rather than attempting to create a distorted background and high levels of warping on the text, this CAPTCHA focuses on making segmentation difficult by adding an angled line." /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://en.wikipedia.org/w/index.php?title=CAPTCHA&oldid=188057612"><DIV class="thumbcaption">
<DIV class="magnify"><A title="Enlarge" class="internal" href="http://en.wikipedia.org/wiki/Image:Modern-captcha.jpg"><IMG width="15" height="11" alt="" src="http://en.wikipedia.org/skins-1.5/common/images/magnify-clip.png" /></A></DIV>
A modern CAPTCHA. Rather than attempting to create a distorted background and high levels of warping on the text, this CAPTCHA focuses on making segmentation difficult by adding an angled line.</DIV></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://en.wikipedia.org/w/index.php?title=CAPTCHA&oldid=188057612"><div align="center"><img src="http://content7.clipmarks.com/blog_cache/en.wikipedia.org/img/ABE1DE14-DC66-4252-9CA9-BC6E840CD7A1" alt="Another way to make segmentation difficult. Crowded symbols can be read by humans but can't be segmented by bots" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://en.wikipedia.org/w/index.php?title=CAPTCHA&oldid=188057612"><DIV class="thumbcaption">
<DIV class="magnify"><A title="Enlarge" class="internal" href="http://en.wikipedia.org/wiki/Image:KCAPTCHA_with_crowded_symbols.gif"><IMG width="15" height="11" alt="" src="http://en.wikipedia.org/skins-1.5/common/images/magnify-clip.png" /></A></DIV>
Another way to make segmentation difficult. Crowded symbols can be read by humans but can't be segmented by bots</DIV></blockquote><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content8.clipmarks.com/images/clip-icon.gif" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.geek.com/tools-available-to-beat-yahoos-captcha-system/" href="http://www.geek.com/tools-available-to-beat-yahoos-captcha-system/" style="font-size: 11px;">www.geek.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.geek.com/tools-available-to-beat-yahoos-captcha-system/"><div align="center"><img src="http://content9.clipmarks.com/blog_cache/www.geek.com/img/BBFEE833-F3AE-4E89-B84B-FA6FFCAC68CA" alt="Geek.com" /></div></blockquote><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content6.clipmarks.com/images/clip-icon.gif" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://network-security-research.blogspot.com/2008/01/yahoo-captcha-is-broken.html" href="http://network-security-research.blogspot.com/2008/01/yahoo-captcha-is-broken.html" style="font-size: 11px;">network-security-research.blogspot.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://network-security-research.blogspot.com/2008/01/yahoo-captcha-is-broken.html"><H1 class="title">
Network Security Research and AI
</H1></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://network-security-research.blogspot.com/2008/01/yahoo-captcha-is-broken.html">Yahoo! CAPTCHA is broken</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://network-security-research.blogspot.com/2008/01/yahoo-captcha-is-broken.html">Few months ago we received information that yahoo CAPTCHA recognition system exists in the wild with the recognition rate about 30%. So we decided to conduct few experiments. We explored yahoo CAPTCHA and designed a similar system with even better recognition rate (about 35%). The vendor was notified. The vendor didn't reply. In this article we’ll present you our own research.</blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/1FD4ACE5-3F8F-4613-AFAD-51400AC742A4/blog/" title="blog or email this clip"><img src="http://content7.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>
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