Hierarchical IPsec Policy Distribution via Secure Tunnels
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Solution Overview
Problem
Existing IPsec implementations face challenges such as complex configuration and management, inability to secure multicast/broadcast traffic, load balancing, network address translation, firewall/IDS conflicts, and limitations in providing high-speed, low-latency encryption across large networks, particularly in scenarios requiring end-to-end security and resilient network traffic.
Innovation Solution
The solution involves dividing security policy definition, key generation, and distribution into separate components, allowing for logical separation of IKE and IPsec functionality, with policies and keys generated and distributed in a distributed manner using Key Generation and Distribution Points (KGDPs), Policy Enforcement Points (PEPs), and Security Policy Managers (SPMs) over secure tunnels, enabling secure policy enforcement and key sharing across devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If IPsec security policies are configured at each Security Gateway individually, then security can be enforced at each device, but configuration complexity and management burden increase significantly
Solution Approach 1:
A central Security Policy Manager is introduced as an intermediary between network administrators and distributed Security Gateways. This central manager handles policy creation, storage, and distribution to multiple gateways, eliminating the need for administrators to manually configure each gateway individually while maintaining security enforcement at the edge devices.
Solution Approach 2:
The system separates policy management functions into two segments: a central Security Policy Manager that handles high-level policy definition and distribution, and distributed Security Gateways that handle local policy enforcement. This segmentation allows complex management tasks to be centralized while keeping enforcement distributed and efficient.
2Reliability
If security policies are distributed to all Security Gateways, then comprehensive security coverage is achieved, but network bandwidth is consumed by policy transmission
Solution Approach 1:
The system implements local quality by allowing each Security Gateway to store and enforce only the security policies relevant to its specific location and traffic patterns, rather than distributing all possible policies to all gateways. This reduces unnecessary network bandwidth consumption while maintaining comprehensive security coverage where needed.
3Reliability
If IPsec encryption is applied to all network traffic, then security is enhanced, but processing speed and latency are degraded
Solution Approach 1:
The system applies IPsec encryption selectively rather than universally - only to traffic that matches defined security policies requiring protection. This partial application of encryption maintains security for sensitive traffic while avoiding the performance penalty of encrypting all network traffic, thus preserving processing speed for non-sensitive data.
4Reliability
If Security Gateways are deployed throughout the network, then security enforcement is improved, but device management and key distribution become more difficult
Solution Approach 1:
The central Security Policy Manager acts as an intermediary that automatically handles key generation, storage, and distribution to multiple Security Gateways. This eliminates the need for manual key management at each gateway, making it easy to deploy and manage distributed security enforcement while maintaining strong security.
Data Source
AI summary
A technique for securing message traffic in a data network using a protocol such as IPsec, and more particularly various methods for distributing security policies among peer entities in a network while minimizing the passing and storage of detailed policy or key information except at the lowest levels of a hierarchy.