What We Collect:
- Search queries
- Click behavior
- Location (city-level)
- Language preference
- Device type

What We Don't Collect:
- Personal identifiers (without consent)
- Precise location (without permission)
- Private browsing data
- Cross-site tracking (without consent)

Anonymization:
- Remove IP addresses after 9 months
- Aggregate query data
- No PII in logs
- Differential privacy for analytics

User Controls:
- View search history
- Delete individual searches
- Delete all history
- Pause history collection
- Auto-delete after 3/18/36 months

Implementation:
- Encrypted storage
- User-specific encryption keys
- Secure deletion (overwrite)
- No recovery after deletion

Privacy Mode:
- Incognito/Private browsing
- No history saved
- No personalization
- Session-only cookies

User Rights:

1. Right to Access:
   - Download all search data
   - JSON/CSV format
   - Complete history

2. Right to Erasure:
   - Delete account
   - Delete search history
   - Remove from index (if webmaster)

3. Right to Portability:
   - Export data
   - Machine-readable format
   - Transfer to competitors

4. Right to Object:
   - Opt-out of personalization
   - Opt-out of ads
   - Opt-out of tracking

Implementation:
- Self-service tools
- Automated processing
- 30-day response time
- Audit trails

Respect Rules:
- Check robots.txt before crawling
- Honor disallow directives
- Respect crawl-delay
- Follow sitemap.xml

Example robots.txt:
User-agent: Googlebot
Disallow: /private/
Disallow: /admin/
Crawl-delay: 10
Sitemap: https://example.com/sitemap.xml

Implementation:
1. Fetch robots.txt
2. Parse directives
3. Cache for 24 hours
4. Apply rules to all URLs
5. Re-fetch if expired

User-Agent:
Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)

Verification:
- Reverse DNS lookup
- Forward DNS confirmation
- IP range verification
- Prevent spoofing

Benefits:
- Sites can identify crawler
- Apply special rules
- Block if needed
- Analytics tracking

Spam Detection:
- Keyword stuffing
- Hidden text
- Cloaking
- Link schemes
- Thin content

Malware Detection:
- Virus scanning
- Phishing detection
- Malicious scripts
- Drive-by downloads
- Social engineering

Actions:
- Warning labels
- Ranking demotion
- De-indexing
- Site owner notification

Safe Browsing:
- Maintain blacklist
- Real-time checks
- Browser warnings
- API for third parties

SafeSearch:
- Filter explicit content
- Adult content detection
- Violence detection
- Hate speech detection

Levels:
- Off: No filtering
- Moderate: Filter explicit images
- Strict: Filter explicit text and images

Implementation:
- ML classifiers
- Human review
- User reports
- Continuous improvement

COPPA Compliance:
- Stricter filtering for children
- No personalized ads
- No data collection
- Parental controls

Threat: Malicious queries to exploit database

Prevention:
- Parameterized queries
- Input validation
- Query sanitization
- No direct SQL execution

Example Attack:
query = "'; DROP TABLE documents; --"

Defense:
- Treat as literal string
- Escape special characters
- No SQL interpretation
- Safe query execution

Threat: Inject malicious scripts in results

Prevention:
- HTML escaping
- Content Security Policy
- Sanitize user input
- No inline scripts

Example Attack:
query = "<script>steal_cookies()</script>"

Defense:
- Escape: &lt;script&gt;...&lt;/script&gt;
- Display as text
- No script execution
- CSP headers

Threat: Overwhelming query volume

Defense Layers:

1. CDN (Cloudflare/Akamai):
   - Absorb attack traffic
   - Rate limiting
   - Geographic filtering

2. Load Balancer:
   - Distribute traffic
   - Health checks
   - Failover

3. Application:
   - Rate limiting per IP
   - CAPTCHA challenges
   - Query complexity limits

4. Infrastructure:
   - Auto-scaling
   - Excess capacity
   - Graceful degradation

Capacity:
- Normal: 92K queries/second
- Peak: 200K queries/second
- DDoS Protection: 1M+ queries/second

Index Data:
- AES-256 encryption
- Encrypted file system
- Key rotation (90 days)
- Hardware security modules (HSM)

User Data:
- Search history: Encrypted
- Preferences: Encrypted
- Personal info: Encrypted
- Separate encryption keys per user

Backups:
- Encrypted backups
- Secure key storage
- Access controls
- Audit logging

HTTPS Everywhere:
- TLS 1.3 (minimum TLS 1.2)
- Strong cipher suites
- Perfect forward secrecy
- HSTS enabled

Certificate Management:
- Automatic renewal
- Certificate pinning
- Transparency logging
- Revocation checking

API Security:
- API keys
- OAuth 2.0
- Rate limiting
- Request signing

Principle of Least Privilege:
- Minimum necessary access
- Role-based access control
- Time-limited access
- Audit logging

Access Levels:
- Read-only: View data
- Operator: Run queries
- Engineer: Modify code
- Admin: Full access

Authentication:
- Multi-factor authentication
- Hardware security keys
- Biometric authentication
- Session management

Audit:
- Log all access
- Monitor anomalies
- Alert on suspicious activity
- Regular reviews

Who Can Access:
- Engineers: Aggregated data only
- Support: User data with consent
- Legal: With legal process
- No one: Without authorization

Restrictions:
- No PII access without reason
- Time-limited access
- Audit trail required
- Manager approval

Compliance:
- GDPR requirements
- CCPA requirements
- Internal policies
- Regular audits

Phases:

1. Detection:
   - Automated monitoring
   - Anomaly detection
   - User reports
   - Security team

2. Containment:
   - Isolate affected systems
   - Block attack vectors
   - Preserve evidence
   - Notify stakeholders

3. Eradication:
   - Remove threat
   - Patch vulnerabilities
   - Update defenses
   - Verify clean

4. Recovery:
   - Restore services
   - Monitor closely
   - Gradual rollout
   - Verify functionality

5. Post-Mortem:
   - Root cause analysis
   - Lessons learned
   - Update procedures
   - Prevent recurrence

Response Time:
- Detection: <5 minutes
- Containment: <30 minutes
- Eradication: <4 hours
- Recovery: <24 hours

Immediate Actions:
1. Assess scope
2. Contain breach
3. Preserve evidence
4. Notify security team
5. Legal consultation

Notification:
- Affected users: Within 72 hours
- Regulators: Within 72 hours (GDPR)
- Law enforcement: If criminal
- Public disclosure: If significant

Remediation:
- Force password reset
- Revoke access tokens
- Patch vulnerability
- Enhanced monitoring
- User support

Communication:
- Transparent disclosure
- Regular updates
- Support resources
- Compensation if needed

GDPR (Europe):
- Data protection
- User rights
- Consent management
- Data portability

CCPA (California):
- Privacy rights
- Opt-out mechanisms
- Data disclosure
- Non-discrimination

COPPA (Children):
- Parental consent
- No data collection
- Safe content
- Privacy protection

Other:
- Local regulations
- Industry standards
- Best practices
- Continuous monitoring

Certifications:
- ISO 27001 (Information Security)
- SOC 2 Type II (Security Controls)
- PCI DSS (Payment Security)
- FedRAMP (Government)

Audits:
- Annual external audits
- Quarterly internal audits
- Penetration testing
- Vulnerability assessments

Compliance Team:
- Dedicated team
- Regular training
- Policy updates
- Incident response