Service framework for dynamic multilingual CAPTCHA challenges: IN-CAPTCHA

It is highly desired to protect online resources from web bots through some form of Human Interaction Proof (HIP) such as CAPTCHA tests. However, there are several challenges associated with designing highly secure and usable CAPTCHA tests. These include challenges to implement, maintain, and upgrade CAPTCHA tests individually for each web application. In addition to these, accessibility to multilingual and non-English web applications is lowered by the use of English language CAPTCHA challenges. Therefore, such challenges in multiple languages or use of language neutral CAPTCHA challenges is highly desired. This paper proposes and discusses service framework for Multilingual Human Interaction Proof (MHIP) that can be used to protect diverse government, corporate and private services/resources offered online in one or more languages besides English language from unauthorized access. The service can be offered at government level to make web applications highly secure against attacks from bots without need of implementing, maintaining, and upgrading CAPTCHA challenges by individual applications. Successful experiments through a model implementation of the proposed framework for Indian Regional CAPTCHA Service named IN-CAPTCHA has validated the working and efficiency of the proposed services framework.