Devanagari Script Based Captcha using Voice Recognition

Speech recognition technology is one from the fast growing engineering technologies. It has a number of applications in different areas and provides potential benefits. Nearly 20 % people of the world are suffering from various disabilities; many of them are blind or unable to use their hands effectively. The speech recognition systems in those particular cases provide a significant help to them, so that they can share information with people by operating computer through voice input CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) is a computer-generated test that humans can pass but current computer systems cannot. CAPTCHA provide a method for automatically distinguishing a human from a computer program, and therefore can protect Web services from abuse by so-called bots. Recently the CAPTCHA test has changed somewhat. Now you are presented with nine small pictures and you must click all that match a specific instruction. All the pictures that contain a storefront for instance. The basic principle remains the same though bots cannot accurately analyse the picture, so they cannot fool the system. The problem is that computers are getting smarter. Artificial Intelligence and machine learning technologies means that bots can teach themselves how to analyse images and identify the letters hidden in them. They can even accurately identify elements in images, allowing them to circumvent newer CAPTCHA systems. Most CAPTCHA consist of distorted images, usually text, for which a user must provide some description. Unfortunately, visual CAPTCHA limit access to the millions of visually impaired people using the Web. The Audio/Voice based CAPTCHA was created to solve this accessibility issue.