Wireless Proximity-Based Secret Key Exchange

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Solution Overview

Problem

Existing communication systems face security vulnerabilities as the secret keys used for encryption/decryption can be compromised, especially in wireless communication protocols like UWB, where secure key exchange between devices is challenging to protect from unauthorized access.

Innovation Solution

Implementing a system that limits communication range during initialization to securely exchange secrets between devices, using Multi-band OFDM protocols, and then extending the range for functional communication while maintaining encryption/decryption security using the shared secret.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If communication range is extended for functional communication, then communication versatility is improved, but security of secret key exchange deteriorates

Engineering Contradiction:

Improvecommunication rangeVSAvoidsecurity of secret key exchange

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent divides communication into two distinct phases: initialization mode with close proximity requirements for secure key exchange, and functional mode with extended range for data communication. This segmentation allows each phase to have optimized parameters appropriate to its security and performance requirements.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent performs secret key exchange during initialization mode before transitioning to functional mode. By completing the security-critical key exchange operation first, when devices are in close proximity, the system establishes secure credentials that protect subsequent extended-range communications.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If close proximity mode is used for secret exchange, then security of key exchange is improved, but communication range is reduced

Engineering Contradiction:

Improvesecurity of key exchangeVSAvoidcommunication range

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent dynamically adjusts communication parameters including transmission power and range based on the operational mode. During initialization mode, the system reduces transmission power to limit range to close proximity only. During functional mode, transmission power is increased to enable extended range communication while maintaining security through previously exchanged keys.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS8601269B2Methods and systems for close proximity wireless communications

Publication Date: 2013.12.03 TEXAS INSTRUMENTS INC

AI summary

A system is provided that includes a first device and a second device. The second device is configured to communicate wirelessly with the first device. The first and second devices selectively reduce an operational range for communications before sharing a secret, the secret related to data encryption.