This extension adds a download button next to the official play button. However, the synthesized speech can only be played but not be downloaded. The official Microsoft TTS website offers a demo app which you can try to synthesize lifelike speech. To carry out the attack, the audio payload is programmatically identified on the page using tools like Selenium, then downloaded and fed into an online audio transcription service such as Google Speech-to-Text API, the results of which are ultimately used to defeat the audio CAPTCHA.įollowing the attack's disclosure, Google updated reCAPTCHA in June 2018 with improved bot detection and support for spoken phrases rather than digits, but not enough to thwart the attack - for the researchers released " unCaptcha2" as a PoC with even better accuracy (91% when compared to unCaptcha's 85%) by using a "screen clicker to move to certain pixels on the screen and move around the page like a human. Microsoft Text to speech is a speech service that converts text to lifelike speech. Offered for accessibility reasons, it poses an audio challenge, allowing people with vision loss to play or download the audio sample and solve the question. A core component within Android is now part of an exclusive club as Speech Service by Google has surpassed 10 billion downloads on the. Smartphones and tablets have improved a lot in terms of accessibility and one of the applications that have contributed to this is Speech Services by Google. The whole attack hinges on a research dubbed " unCaptcha," published by University of Maryland researchers in April 2017 targeting the audio version of reCAPTCHA.
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