Introduction

🛡️ 1. Introduction

GKTinc (GuardianKey – This Is Not CAPTCHA!) is a cryptographic deterrence system designed to thwart large-scale attacks—such as brute force, credential stuffing, and denial of service—without burdening the user experience. Instead of presenting visual challenges, menus, or selectable items like traditional CAPTCHAs, GKTinc applies a silent and dynamic cryptographic challenge, executed in the browser via JavaScript.

This lightweight computational load is dynamically adjusted according to the risk level of the request's origin, ensuring protection that matches the threat level—without interrupting the user experience.

While reCAPTCHA (and similar solutions) rely on visual tests and heuristics that can be bypassed by AI and specialized services, GKTinc imposes a mathematical barrier that is inefficient for bots but virtually invisible to users, requiring only microseconds of processing—similar to what users are accustomed to with reCAPTCHA, but now without any visible interface.