Security Whitepaper

Version 2.1 | Last Updated: January 2025

Comprehensive overview of ClientFlow's security architecture, encryption standards, compliance certifications, and data protection measures for enterprise customers.

Executive Summary

ClientFlow is built with security-first architecture, protecting your client data with enterprise-grade encryption, multi-layer access controls, and continuous security monitoring.

Security Measure	Implementation
Encryption at Rest	AES-256-GCM (NIST approved)
Encryption in Transit	TLS 1.3 (latest standard)
Password Storage	bcrypt with 12 rounds
Session Management	JWT with 15-minute expiry
Two-Factor Authentication	TOTP (Google Authenticator compatible)
Infrastructure	EU datacenter (Frankfurt), ISO 27001 certified

Data Encryption

At-Rest Encryption

• Database: PostgreSQL with transparent data encryption (AES-256)
• File Storage: Cloudflare R2 with server-side encryption
• Credentials: AES-256-GCM with secure key management
• Backups: Encrypted with separate backup keys

In-Transit Encryption

• TLS 1.3 only (older versions disabled)
• HSTS enforced (HTTP Strict Transport Security)
• Perfect Forward Secrecy (PFS) enabled
• Certificate transparency monitoring

Access Control

Authentication

• Password Requirements: Minimum 8 characters, complexity enforced
• 2FA: Optional TOTP-based second factor
• Session Timeout: 15 minutes inactivity auto-logout
• Brute Force Protection: Account lockout after 10 failed attempts

Multi-Tenancy Isolation

• All database queries filtered by user_id
• No cross-tenant data access possible
• Row-level security enforced at database level
• API endpoints validate ownership on every request

Infrastructure Security

Component	Provider	Location	Certification
Application Server	Hetzner	Frankfurt, Germany	ISO 27001
Database	Hetzner PostgreSQL	Frankfurt, Germany	ISO 27001
File Storage	Cloudflare R2	EU Regions	ISO 27001, SOC 2
CDN	Vercel Edge	Global	SOC 2

Compliance

• GDPR: Full compliance with EU data protection regulations
• KVKK: Turkish data protection law compliance
• HIPAA-Ready: Architecture supports HIPAA requirements (BAA available)
• PCI DSS: Card data handled via PCI-compliant processor (iyzico)

Security Monitoring

• Audit Logging: All user actions logged with timestamps
• Intrusion Detection: Automated alerting on suspicious activity
• Vulnerability Scanning: Daily automated scans
• Penetration Testing: Quarterly third-party assessments

Incident Response

1. Detection: Automated monitoring with <5 minute alert time
2. Containment: Immediate isolation of affected systems
3. Investigation: Root cause analysis within 24 hours
4. Notification: Customer notification within 72 hours (per GDPR)
5. Recovery: Service restoration with verified integrity

Contact

Security Team: security@clientflow.center

Data Protection Officer: dpo@clientflow.center

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Read time: ~20 minutes | Audience: IT Security, Compliance Officers