Dec 25, 2016

Has he read this paper?

Dec 25, 2016

At first, ReCaptcha was used to transcribe books, and then in 2012 Google began to use it for street data. The GP is referring to its newest use, which is based on an image classification algorithm. Image search used to rely on nearby words on websites and in the URL, since computer vision was just a research technology.

Ironically, this new captcha has already been attacked using Google's own reverse image search:

Jun 29, 2016

For anymore interested in a slightly lighter version of the paper, it was presented at Black-Hat Asia 2016: