Hybrid PKI Keyloading to Shorten Secure Radio Key Exposure

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Solution Overview

Problem

Military communication systems face high vulnerability due to labor-intensive manual key loading, infrequent key changes, and compromised keys leading to prolonged exposure, while modern PKI-based solutions are not widely adopted due to PRNG/RNG security concerns.

Innovation Solution

A hybrid PKI keyloader method integrating manual keyloaders with PKI-based Continuous Key Agreement (CKA) protocols, combining pre-shared and PKI-derived symmetric keys through a key derivation function (KDF) to create a combined encryption and authentication key, enhancing security and reducing manual intervention.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If manual key loading is used, then key distribution is simple, but key changes are infrequent and vulnerability window is prolonged

Engineering Contradiction:

Improvekey distribution simplicityVSAvoidvulnerability window duration

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent combines manual keyloader with automated PKI-based key exchange protocols to create a hybrid system. The manual keyloader provides initial key material while the PKI protocol automatically derives and exchanges additional key material, merging the simplicity of manual operation with the automated security benefits of modern cryptography to reduce vulnerability windows without requiring frequent manual intervention

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The system performs preliminary key material generation and PKI certificate exchange before actual communication begins. By establishing the cryptographic infrastructure in advance through automated means, the system prepares secure communication channels without requiring manual key loading at the time of use, thereby reducing the vulnerability window while maintaining operational simplicity

Inventive Principle:

Principle #10Preliminary action

2Device complexity

If manual key loading is used, then device complexity is low, but security vulnerability increases due to key compromise exposure

Engineering Contradiction:

Improvekey loader simplicityVSAvoidkey compromise vulnerability

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The patent segments the key management function into two independent parts: a simple manual keyloader for initial key material entry and a complex automated PKI-based key exchange protocol for subsequent key derivation and exchange. This segmentation allows the simple device to maintain low complexity while the automated protocol handles security functions, isolating the vulnerability impact to only the manual key material rather than all communication keys

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The PKI-based key exchange protocol acts as an intermediary between the manual keyloader and the actual communication encryption. It takes the manual key material as input and automatically derives additional key material through cryptographic operations, serving as a security buffer that protects against key compromise while maintaining the simplicity of the manual loading interface

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If PKI-based key exchange is used alone, then key changes are frequent and security is improved, but PRNG/RNG security concerns arise

Engineering Contradiction:

Improvekey update frequencyVSAvoidPRNG/RNG security trust

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent merges manual key material input with automated PKI-based key derivation to create a hybrid system. The manual keyloader provides trusted initial key material that seeds the PKI key exchange protocol, combining the security benefits of frequent automated key updates with the trustworthiness of manual key material, thereby addressing PRNG/RNG security concerns while maintaining frequent key changes

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The system performs preliminary manual key material entry before automated PKI key exchange begins. By establishing trusted initial key material through manual input, the system creates a secure foundation that allows subsequent automated key derivation to proceed with reduced reliance on potentially compromised PRNG/RNG systems, thereby addressing security trust issues while maintaining frequent key updates

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12495021B2Hybrid PKI keyloader methods and systems

Publication Date: 2025.12.09 THE GOVERNMENT OF THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY DEPARTMENT OF HEALTH & HUMAN SERVICES

AI summary

A method and system for cryptographically securing communication systems between a plurality of communication devices includes manually providing a pre-shared encryption and/or authentication key via one or more key loader devices to the communication devices; deriving a PKI based protocol derived symmetric encryption and/or authentication key; processing the pre-shared encryption and/or authentication key and the PKI based protocol derived symmetric encryption and/or authentication key to generate a combined encryption and/or authentication key; and using the combined encryption and/or authentication key to encrypt and/or authenticate communications between the plurality of communication devices.