15 citations · 16 across the 2 of their papers we have counts for
2 papers
cs.CR2017★ 1 cited
An oracle-based attack on CAPTCHAs protected against oracle attacks
Carlos Javier Hernández-Castro, María D. R-Moreno, David F. Barrero +1
CAPTCHAs/HIPs are security mechanisms that try to prevent automatic abuse of services. They are susceptible to learning attacks in which attackers can use them as oracles. Kwon and…
cs.CR2009★ 15 cited
Side-channel attack on labeling CAPTCHAs
Carlos Javier Hernandez-Castro, Arturo Ribagorda, Yago Saez
We propose a new scheme of attack on the Microsoft's ASIRRA CAPTCHA which represents a significant shortcut to the intended attacking path, as it is not based in any advance in the…