SECURITY.md

Security Review - ELI5 Park

Date: 2026-02-21

Review Type: Static Analysis

---

✅ GOOD SECURITY PRACTICES FOUND

1. No External Dependencies (Most of Site)

• All main site pages use vanilla HTML, CSS, JavaScript
• Tailwind CDN removed from LeetCode section (Feb 2026)
• All JavaScript is inline or locally hosted
• Exception: Chart.js CDN on magic-money-tree page

2. No User Data Collection

• No forms that collect user data
• No localStorage/sessionStorage/cookies used
• No authentication or user accounts
• No API calls to external services

3. Content Security

• All links are relative or to trusted domains (self)
• No user-generated content
• No injection points (all content is static)

4. HTTPS Ready

• Works over HTTPS via GitHub Pages
• No mixed content issues

---

⚠️ MINOR ISSUES (Low Priority)

1. Chart.js CDN

Location: finance/magic-money-tree.html Issue: Uses https://cdn.jsdelivr.net/npm/chart.js Risk: Low - trusted CDN, widely used Note: Could be bundled locally for maximum security

2. Inline Event Handlers

Location: All pages use onclick="function()" Risk: Low - functions are self-contained, no external input Note: Standard practice for simple interactive demos

---

📋 PWA READINESS

✅ Implemented

• manifest.json
• service-worker.js
• Meta tags for PWA (theme-color, apple-mobile-web-app)
• Mobile viewport settings

⚠️ Needs Before Play Store

• Create proper PNG icons (192x192, 512x512)
• Test offline functionality
• Add privacy policy (in /docs)
• Add security policy (in /docs)
• Add fact check policy (in /docs)
• Test on actual devices

---

📚 DOCUMENTATION

All documentation available at /docs/:

• Privacy Policy: /docs/privacy.html
• Security Policy: /docs/security.html
• Fact Check Policy: /docs/fact-check.html

---

📱 PLAY STORE SPECIFIC REQUIREMENTS (To Do)

1. Privacy Policy URL required
2. App icon (512x512 PNG)
3. Screenshots (phone and tablet)
4. Content rating questionnaire
5. Target API level 33+ (Android 13+)
6. 64-bit architecture support
7. App bundle (.aab) preferred over APK

---

✅ SECURITY SUMMARY

This site is SECURE for public use:

• No user data collected
• No external tracking
• No authentication required
• Minimal external dependencies
• Static content = low attack surface