Secure Channel Key Exchange Using Session IDs and Two Round Trips

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Solution Overview

Problem

Existing security establishment procedures, such as SPAKE2+, are vulnerable to man-in-the-middle attacks and require multiple round trips, which can compromise security and increase latency, especially in wireless networks with many devices.

Innovation Solution

Implementing a security establishment protocol that associates security establishment messages with a session identifier, allowing devices to ensure a single session is active and linking to the correct peer, while reducing the number of round trips to two, using preamble messages with identifiers and random values to enhance security and efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If existing security establishment procedures (SPAKE2+) are used, then security can be established between devices, but the procedures are vulnerable to man-in-the-middle attacks and require multiple round trips

Engineering Contradiction:

ImprovesecurityVSAvoidprotocol latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by establishing session identifiers and random values in advance during the preamble phase, before the actual key exchange occurs. This allows devices to pre-associate security establishment messages with the correct communication link, preventing man-in-the-middle attacks and enabling the protocol to be completed in fewer round trips, thus reducing latency while maintaining security

Inventive Principle:

Principle #10Preliminary action

2Device complexity

If security establishment messages are not associated with session identifiers, then protocol implementation is simpler, but devices cannot ensure a single session is active or link to the correct peer

Engineering Contradiction:

Improveprotocol implementation complexityVSAvoidsession management security

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent introduces session identifiers as an intermediary element that mediates between the simplicity of protocol implementation and the need for secure session management. The session identifier acts as a reference key that associates security establishment messages with specific communication links, allowing devices to verify they are communicating with the correct peer without significantly complicating the protocol implementation

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If multiple round trips are used in security establishment, then more security checks can be performed, but protocol latency increases especially in wireless networks with many devices

Engineering Contradiction:

Improvesecurity verificationVSAvoidprotocol efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent merges multiple security verification steps into a consolidated process that can be completed within two round trips. By combining session identifier verification, random value exchange, and key establishment into a streamlined sequence, the protocol maintains comprehensive security checks while reducing the number of separate message exchanges required, thereby improving efficiency in wireless networks with many devices

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20260032007A1Improved security establishment methods and systems

Publication Date: 2026.01.29 KONINKLIJKE PHILIPS NV

AI summary

The invention relates to methods and devices for setting up a secure communication channel with an improved key exchange for a security establishment protocol or procedure.