Abstract: The advancing techniques of sophisticated cyber attacks have rendered the traditional methods of password-based authentication incapable of securing sensitive information or user accounts. The authentication that this project deals with integrates One-Time Passwords (OTPs) and CAPTCHAs in a multi-layered security approach. OTPs, delivered via SMS, email, or authenticator apps, ensure that only authorized users may access an account by entering a code with a limited lifetime. CAPTCHAs, unlike an OTP, take the approach of distinguishing between human users and bots through various challenges such as image recognition or text puzzles, which prove useless against automated attacks. These two mechanisms circumvent the problems delineated by traditional passwords and greatly improve the protection of information against phishing, brute thing attacks, and unauthorized access. Usability is front and center in the system design, and as such, it provides features like real-time feedback, accessibility characteristics, and ways to sometimes reduce friction for trusted users. It is applicable in diverse fields such as banking, e-commerce, and social media, where securing user data and preventing fraud is paramount. Although there exist challenges, such as user resistance, technical issues, and evolving threats, the system provides an opportunity for a scalable and tactical solution that upholds a user's experience closely in balance to security. The project proposes an online security enhancement through trust generation among users on a digital platform by leveraging strengths offered by OTP and CAPTCHA towards building a secure authentication framework.
Keywords: One-Time Password (OTP), CAPTCHA, authentication, cybersecurity
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