unCAPTCHA: H Google rushed to celebrate the security offered by the reCAPTCHA service, a system that automatically recognizes that you are not a bot. 
A group of researchers from the University of Maryland developed a new algorithm, which they called unCAPTCHA. The new algorithm μπορεί να νικήσει το σύστημα reCAPTCHA της Google με ποσοστό επιτυχίας 85 τοις εκατό. Η συγκεκριμένη μέθοδος εκμεταλλεύεται μια ευπάθεια στην έκδοση ήχου του reCAPTCHA.
The researchers used browser automation software to analyze the necessary data and determine the numbers reported by Google. They then transmitted these numbers programmatically, in order to trick the points that make Google's AI distinguish bots from humans.
To make this happen, the AI they developed violates several known flaws in Google's security system to significantly reduce the level of suspicion of reCAPTCHA.
Most impressively, the researchers used a number of audio transcription services to beat the system. Curiously, these services it was IBM, Google Cloud and Speech Recognition, Sphinx, Wit-AI, but also Bing Speech Recognition. So, somehow, the researchers used Google technology to hack Google technology.
Following the revelation of this flaw in the Big G in April, researchers report that the company has added some additional protections that limit the success rate of unCAPTCHA.
"For example, Google has also improved browser automation detection. In addition, we have noticed that some sounds include not only digits but also small excerpts of spoken text. ”
Researchers have since released the complete PoC in a paper where you can see all the details [PDF]. The paper was officially presented at Usenix WOOT '17 held in Vancouver.
Watch the video
