Privacy-First Client-Side Consent Management for Quantum-Safe Security-as-a-Service Platforms: GDPR/CCPA-Compliant Cookie Architecture

Security-as-a-service platforms that process threat detection data must implement transparent privacy controls to comply with GDPR and CCPA requirements, yet existing consent management platforms (CMPs) introduce third-party JavaScript dependencies and external data flows that contradict the trust model of a security platform. We present a self-contained, zero-dependency cookie consent architecture for QCrypton that provides: (1) a granular four-category consent model (necessary, functional, analytics, marketing) where only necessary cookies are non-optional; (2) a three-action consent banner (Accept All, Deny, Customize) with a persistent floating action button for preference modification; (3) client-side preference persistence via a single first-party cookie (qc_cookie_consent) with 365-day expiry and SameSite=Lax attributes; (4) an event-driven integration model via CustomEvent dispatch (cookieConsentChanged) enabling other scripts to react to consent changes without polling; and (5) companion legal pages (privacy policy, terms of service, cookie declaration) tailored to quantum-safe security data processing contexts. The architecture processes consent decisions entirely client-side with no external service calls, ensuring that consent management itself does not create the privacy exposure it aims to prevent. We evaluate the implementation against GDPR Article 7 consent requirements, CCPA opt-out provisions, and the IAB Transparency and Consent Framework, demonstrating compliance without third-party CMP dependencies.