VPN and Encryption

Overview

VPN and encryption controls protect data confidentiality and integrity across untrusted networks.

Core Concepts

• Site-to-site and client VPN models
• Encryption at rest and in transit
• Key management lifecycle
• Strong algorithm and protocol selection

flowchart LR
    A[Remote Client] --> B[VPN Gateway]
    B --> C[Private Network]
    C --> D[Internal Services]

Practical Example

IPsec tunnel
- IKEv2
- AES-256
- Perfect Forward Secrecy enabled

Production Example

Distributed teams commonly access internal management systems through VPN with MFA and device posture checks.

Common Pitfalls

• Shared VPN credentials across users
• Weak legacy ciphers
• No key rotation policy

Key Takeaways

• VPNs provide secure transport into private environments.
• Encryption strength depends on protocol and key hygiene.
• Identity-aware access controls strengthen VPN security.