Google’s speech-to-text can be used to break its own reCAPTCHA. | Photo Credit: Special Arrangement Completely Automated Public Turing Test to Tell Computers and Humans Apart (CAPTCHA) is Google’s service that uses images, audio and text challenges to check whether a human is signing into an account. (Subscribe to our Today's Cache newsletter for a quick snapshot of top 5 tech stories. Click here to subscribe for free.) Google’s voice-to-text API can be used to bypass the audio version of its own CAPTCHA protections, according to technology researcher Nikolai Tschacher. The researcher used an old trick with the latest version of reCAPTCHA and found that the method can be used to break the protection system with a 97% success rate.