Indian Journal of Science and Technology

Abstract

Objectives: In the modern era of web services, the web site registration process plays a vital role for authorized access. The process can be easily cracked by the hackers through their false registration. To overcome this problem, we introduce a Variant Random Order (VRO) in text-graphics color CAPTCHA approach for enhancing web security. Methods: In our proposed approach, the user has to enter all the characters based on the random number generation model, where the random number is to be displayed under the corresponding CAPTCHA characters. Based on the sorted order (generally ascending) of the random number, the user has to select the CAPTCHA characters one by one and to fill in the given empty text box. After typing all the characters from a given CAPTCHA, then the user can sign and enter into the required web area. If any mistake made in the entry process, a new CAPTCHA will be generated for the same login process. Consequently, we say that the process will be unbreakable by any Robot and in turn the website access is completely restricted. The number of CAPTCHA characters along with a random number is to be varied for every attempt. Also, each and every character in the CAPTCHA is to be represented with different colors, which in turn the pixel intensity can be varied for the same character representation. Findings: Applications: This type of techniques helps the proposed system to display the CAPTCHA with additional security in major application areas such as health services, military services and banking services.

Keywords: CAPTCHA-Completely Automated Public Turing Test to Tell Computer and Human Apart, Text Graphics Color, VRO-Variant Random Order, Web Access, Web Security