Abstract: CAPTCHA is used as a standard security mechanism to prevent the bots to enter into the commercial websites like e-Governance, inventory, educational sector and so on. Nowadays, hackers wrote malicious program and enter into the website to destroy their resources. To prevent such kind of activities in our proposed approach introduces a Random Ordered Time Dependent Color CAPTCHA (ROTDCC) for enhancing the web security protection. In such a case, the user has to enter all the characters based on the random number generation model for ensuring the security on web access. Based on the final user entry, a system can note the time and allots the random number for each allocate CAPTCHA character in the screening test. There are permutable choice to allocate various ordered random numbers for the CAPTCHAs character using Modulo Division Nine (MDN) algorithm. All the characters used in the CAPTCHA word are to be represented in different colors. This makes the same character can have the chance to represent different colors which in turn the pixel count and intensity value vary. Some graphical operation and cracks are added in the CAPTCHA word to perform a CAPTCHA entry test by the user. Consequently, this method is unbreakable by any robot using machine learning technique and in turn the human based threats to be reduced. This proposed system to display the CAPTCHA on the web entry form provide with additional security in major application areas such as banking sectors, online shopping and defense services.