Bios & Handouts



  • Charudatta Jadhav, DR., TATA Consultancy Services Ltd.
  • Sumeet Agrawal, Mrs., Tata Consultancy Services

Session Details

  • Length of Session: 1-hr
  • Format: Lecture
  • Expertise Level: Beginner
  • Type of session: General Conference


In this session we will be presenting an INCLUSIVE CAPTCHA fulfilling all of the three orthogonal properties Usability + Security + Accessibility.


Visual CAPTCHAs are designed to be unreadable by machines, hence are inaccessible to assistive technology users. Audio CAPTCHA cater to assistive technology users but may be difficult to solve, time consuming and have low success rate as seen in research literature, thus degrading usability and accessibility. Also the current state of Audio CAPTCHAs can be broken by high-quality ASR and noise removal systems. There is always a tradeoff between the goals of security, accessibility and usability. Our solution aims to provide a new CAPTCHA fulfilling all the goals of three properties. The CAPTCHA generation module randomly selects a theme (For example - conversation in a park), then creates a media file by combining two or more media files pertaining to main dialogues, environmental, background noise and background speech. The combined audio file is then presented to the user along with a comprehension question to be solved. Quantitative and quantitative analysis of the user study conducted with 24 screen reader users (partially blind or completely blind) and 95 non-disabled (main stream) users recruited by crowd sourcing will also be covered.


  1. Accessible and Secure CAPTCHA
  2. Inclusive design
  3. Audio CAPTCHA

Disability Areas

accessible design, Cognitive/Learning, Vision

Topic Areas

Information Technology, Uncategorized, Web/Media Access

Speaker Bio(s)

Charudatta Jadhav

Dr. Charudatta Jadhav is working as Head, Accessibility Center of Excellence for Tata Consultancy Services Ltd (TCS).He has been working as a key architect and lead consultant in establishing Accessibility practice in TCS organization wide. Strongly believes in Universal designed centric approach to personalize the user experience while designing IT products, solutions or any devices so that all people reach their highest potential in work and life. He is striving for integrating accessibility in the DNA of TCS and drives accessibility as integral part of business strategy. Apart from his professional commitments he is also actively involved as Vice President of International Braille Chess Association (IBCA apex world body of blind chess) since 2008, first and only ASIAN to receive this honor and is also Founder and President of All India Chess Federation for the Blind (AICFB).

Sumeet Agrawal

Sumeet Agrawal is working as Accessibility Lead, Accessibility Center of Excellence for Tata Consultancy Services Ltd (TCS).She has extensive project management experience in running accessibility projects for TCS. She has played a very important role in establishing Accessibility practice in TCS organization wide and has given numerous training on Web accessibility. She is current involved in various accessibility research areas.