I guess "CAPTCHA" research is not a left field topic for accessibility researchers, but while I was browsing the ACM DL, I came across a workshop called "EUROSEC: Third European Workshop on System Security" which was held this month in Paris, France. A paper published in this workshop caught my attention called "The robustness of a new CAPTCHA". Even though this paper examines the security of a new CAPTCHA, I though people who work on making CAPTCHAs accessible would find this paper interesting.

The robustness of a new CAPTCHA

"CAPTCHA is a standard security technology that presents tests to tell computers and humans apart. In this paper, we examine the security of a new CAPTCHA that was deployed until very recently by Megaupload, a leading online storage and delivery website. The security of this scheme relies on a novel segmentation resistance mechanism. However, we show that this CAPTCHA can be segmented using a simple but new automated attack with a success rate of 78%. It takes about 120 ms on average to segment each challenge on a standard desktop computer."

Full Paper: http://doi.acm.org/10.1145/1752046.1752052
Full Proceedings: Labels: captcha, security, Web accessibility