Operations Log

SecureCall version history and changelog · Last updated February 2026

Phase 13: Website Rebuild

• Complete website rebuild with military/tactical dark theme design
• New pages: security.html, faq.html with tier comparison table
• Full wiki documentation system with sidebar navigation and classified banners
• Responsive design with breakpoints at 1024px, 768px, and 480px
• SEO optimization with robots.txt and sitemap.xml
• Deploy-ready configuration for GitHub Pages and Netlify

Phase 12: Production Deployment + QA

• Production deployment scripts (PM2 process manager, Nginx reverse proxy, Coturn TURN server, SSL/TLS certificates)
• Final QA checklist covering 80+ test cases across 15 categories
• Instrumented security tests — 10 automated tests validating crypto operations and transport security
• Performance testing tools for measuring call setup latency, audio quality, and server throughput
• Release AAB (Android App Bundle) build scripts for Play Store submission

Phase 11: Backend Deployment + Landing Page

• Docker deployment configuration for containerized backend services
• Nginx reverse proxy with SSL termination and WebSocket upgrade support
• Coturn TURN server configuration for NAT traversal in restrictive networks
• Landing page website (HTML/CSS/JS) deployed to GitHub Pages
• Health check endpoints and automated backup scripts

Critical Security Fix: Anti-Recording Protection

Implemented a comprehensive 6-layer anti-recording defense system to protect call confidentiality:

• AudioFocusManager — exclusive audio focus acquisition preventing other apps from capturing audio output
• ScreenRecordingDetector — API 34+ native callbacks combined with process monitoring for older devices
• MicrophoneMonitor — AudioRecordingCallback detection for unauthorized microphone access during calls
• AccessibilityDetector — spy app detection scanning for 20+ known surveillance applications
• CallRecordingDetector — database of known call recording applications with real-time process scanning
• SecureCallMonitor — central threat monitoring coordinator aggregating signals from all detection layers
• FLAG_SECURE integration in CallActivity preventing screenshots and screen recording of the call UI
• Tier-based enforcement policy: WARN (Free) / BLOCK (Pro) / TERMINATE (Premium)

Phase 10: Play Store Preparation

• Play Store listings prepared in German (DE) and English (EN) with full descriptions and feature graphics
• Privacy Policy drafted for GDPR compliance with data processing disclosures
• Beta testing plan with structured rollout to 10–20 initial testers
• Marketing launch plan with phased feature announcements
• Build release guide documenting the signing, bundling, and upload process

Phase 9: UI/UX Modernization

• Material Design 3 implementation across all screens and components
• Dynamic color theming with system-aware dark/light mode support
• Modern call screen with connection animations and real-time status indicators
• Improved settings UI with categorized preferences and toggle controls

Phase 8: Android Production Hardening

• R8/ProGuard minification and code shrinking for reduced APK size
• Firebase Crashlytics integration for crash reporting (Free tier only, opt-out available)
• Debug UI gating — development-only UI elements hidden in production builds

Phase 7: Opus Audio + FCM

• Opus audio codec integration at 48kHz sampling rate for high-fidelity encrypted voice
• Firebase Cloud Messaging (FCM) for push notification delivery of incoming calls
• Background call notification handling with wake-lock management

Phase 6: In-App Purchases

• Google Play Billing Library integration for subscription management
• Three subscription tiers: Free (limited), Pro (unlimited), Premium (maximum security)
• Feature flags per tier controlled via BuildConfig fields and FeatureProviderRegistry
• Subscription verification via backend server with receipt validation

Security Audit

• Comprehensive internal security audit conducted February 15, 2026
• 48 findings identified: 7 Critical, 18 High, 23 Medium
• All Critical and High findings fixed and verified (see Security Audit Report)
• 23 Medium findings filed as GitHub Issues for ongoing tracking
• Key fixes: crypto stubs replaced, plaintext fallback removed, buffer overflow patched, debug endpoints removed

Initial Release

• Monorepo project structure established (Android client, backend, Rust crypto, website, docs)
• Rust crypto engine implementing XChaCha20-Poly1305 symmetric encryption, X25519 key exchange, and HKDF-SHA256 key derivation
• JNI bridge via C++ CMake configuration for calling Rust from Kotlin
• Node.js signaling server with WebSocket transport for call setup and key exchange
• Android client with basic UI: dialer, contacts, call history, and settings screens
• CI linting workflow with GitHub Actions for automated code quality checks
• Security design documentation and architecture overview