Endpoint State Management for Replay Attack Protection
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Solution Overview
Problem
Existing systems face challenges in managing packet sequence numbers (PSNs) to protect against replay attacks, particularly in distributed systems with a large number of nodes, leading to increased costs and inefficiencies due to frequent round-trip failures.
Innovation Solution
Implementing endpoint state management by enforcing monotonically increasing starting PSNs and expected incoming PSNs for each node, updating these values upon connection openings and closings, and using segmentation to minimize the rate of PSN increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If packet sequence numbers (PSNs) are managed to protect against replay attacks in distributed systems, then security against replay attacks is improved, but system complexity and cost increase due to frequent round-trip failures
Solution Approach 1:
The patent segments the PSN management by introducing separate fields (starting PSN and expected incoming PSN) for different purposes. The starting PSN is used for initial connection establishment, while the expected incoming PSN tracks subsequent packets. This segmentation allows each field to serve its specific function without causing confusion, reducing round-trip failures while maintaining security.
Solution Approach 2:
The patent applies preliminary action by pre-establishing the starting PSN and expected incoming PSN fields before connection failures occur. By initializing these fields with appropriate values and updating them proactively during connection establishment and termination, the system prevents round-trip failures before they happen, reducing overall system complexity.
2Reliability
If packet sequence numbers (PSNs) are managed to protect against replay attacks, then security against replay attacks is improved, but operational efficiency deteriorates due to frequent round-trip failures
Solution Approach 1:
By segmenting PSN management into starting PSN and expected incoming PSN fields, the patent eliminates confusion between different PSN types. This segmentation prevents unnecessary round-trip failures for connection establishment, thereby improving operational efficiency while maintaining replay attack protection.
Solution Approach 2:
The patent implements feedback mechanisms where nodes exchange starting PSN and expected incoming PSN values during connection establishment and termination. This feedback loop ensures both nodes have synchronized understanding of PSN expectations, preventing round-trip failures and improving operational efficiency.
3Reliability
If starting PSN and expected incoming PSN are updated frequently upon connection openings and closings, then replay attack protection is strengthened, but unnecessary traffic increases
Solution Approach 1:
The patent applies preliminary action by updating the expected incoming PSN field proactively during connection establishment and termination phases. By performing these updates in advance rather than reactively during failures, the system strengthens replay attack protection without generating unnecessary traffic for correction.
Solution Approach 2:
The system performs self-service by automatically managing and updating PSN fields based on connection state changes. The starting PSN and expected incoming PSN are updated autonomously during connection establishment and termination, eliminating the need for additional corrective traffic while maintaining strong replay attack protection.
Data Source
AI summary
A destination node receives a connection request packet which indicates a starting packet sequence number (PSN) associated with a source node. The destination node accepts a first connection corresponding to the connection request packet in response to the starting PSN being valid. In response to the source node closing the first connection, the destination node: sets an expected incoming PSN associated with the destination node to a greater of a current value of the expected incoming PSN and the starting PSN associated with the source node incremented by one; sends to the source node a close response message which includes the expected incoming PSN; and allows the source node to set the starting PSN to a greater of a current value of the starting PSN incremented by one and the expected incoming PSN associated with the destination node.