NFC Radio Key Distribution via Electromagnetic Induction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing key distribution methods for two-way radios are inconvenient and costly, particularly for users who require frequent key changes, as they often necessitate external hardware, cables, and complex centralized systems, which can lead to security issues due to infrequent key updates.
Innovation Solution
A communication system utilizing near-field communication (NFC) for secure key distribution among radios, allowing for key generation and exchange without external hardware, enabling on-the-spot re-keying and secure communication across groups or events, with radios capable of acting as either master or slave in NFC operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If software-based encryption with CPS programming is used, then cost is reduced, but key distribution convenience deteriorates due to requirement of cables and external devices
Solution Approach 1:
The patent extracts the key distribution function from external devices (CPS programming stations, cables, PCs) and relocates it directly into the radio device itself. The radio now contains integrated NFC transceivers and key storage memory that enable autonomous key generation, storage, and distribution without external programming equipment.
Solution Approach 2:
The patent introduces NFC (Near Field Communication) as an intermediary technology to enable wireless key distribution between radios. The NFC transceiver acts as a mediator that facilitates secure proximity-based communication for key exchange, replacing the need for physical cable connections while maintaining security.
2Ease of operation
If centralized key management systems are used, then key distribution control is improved, but system complexity and cost increase
Solution Approach 1:
The patent implements self-service capability where radios autonomously generate, store, and distribute their own encryption keys using integrated NFC transceivers and memory. Each radio acts as its own key management system, eliminating the need for centralized key management infrastructure while maintaining operational control.
Solution Approach 2:
The patent makes the radio device universal by integrating multiple functions: the radio performs both communication and key management operations. The NFC transceiver and key storage memory enable the radio to function as both a communication device and a self-contained key distribution system, reducing overall system complexity.
3Reliability
If frequent key changes are implemented, then security is improved, but operational convenience deteriorates due to rekeying requirements
Solution Approach 1:
The patent enables continuous key distribution capability through integrated NFC transceivers that allow radios to exchange keys on-demand without interrupting communication operations. Keys can be distributed continuously as needed, maintaining security while minimizing disruption to operational workflow.
Solution Approach 2:
The patent implements preliminary key generation and storage within the radio's memory before distribution is needed. Keys are pre-generated and stored in key storage memory, allowing rapid deployment and distribution when required, reducing the time penalty associated with frequent key changes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution facilitates secure, efficient, and cost-effective key distribution and re-keying, minimizing logistical issues and unauthorized monitoring, as radios can be rapidly re-provisioned for different events or groups without the need for cables or external devices, ensuring continuous secure communication.
Implementation Method 1
at least one cryptographic key from a first radio device to a second radio device using near-field communication
Data Source
AI summary
An apparatus and method to provision and distribute a traffic key amongst a plurality of radios enables secure communication, for a predetermined group or a predetermined event. Each radio has a controller, a radio transceiver for electromagnetic radio communications, and a near-field transceiver for near-field communications (NFC). The traffic key (or traffic keys) is provisioned locally at one radio and distributed to the remaining radios utilizing the NFC over a non propagating link. The same traffic key is distributed amongst all radios, and additional restrictions may be applied if desired. The same radios can later be re-provisioned for a different group or event. The local provisioning and distribution is highly advantageous for markets that do not require permanent assignment of radios.