Image CAPTCHA Integration for Authentication

I need a lightweight Image CAPTCHA added to my existing sign-in form so that every user interaction is verified before the request reaches the server. The challenge should present a set of simple object images (think cats vs. dogs, cars vs. bikes—no cluttered scenes) and require the user to pick the correct item in order to continue. Here’s what matters most: • Accuracy and speed: the CAPTCHA has to load quickly and flag bots reliably without delaying real visitors. • Clean, accessible code: please write modular, well-commented PHP/JavaScript (or a similarly common stack) so I can tweak imagery or thresholds later. • Server-side validation: after the browser picks up the user’s choice, I want a secure back-end check to prevent spoofing. • Seamless look and feel: match the colours and typography of my current form; no jarring iframes or external branding. Once finished, deliver the full source, image set, and a short README covering installation and customization. I will test by deploying it on a staging URL—if bots slip through or real users stall, we’ll iterate until the pass rate is solid.

Project ID: 40429717