Nested PQC-TLS Channel for Quantum-Secure Communication

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Solution Overview

Problem

Existing communication systems face challenges in implementing quantum security due to the presence of intermediate devices that do not support post-quantum cryptography (PQC)-transport layer security (TLS) protocols, leading to exposure to quantum threats.

Innovation Solution

A communication method and device that form a general security channel using a first TLS protocol, followed by a quantum security channel through a PQC-TLS protocol handshake in the application layer, enabling secure communication even with intermediate devices that do not support PQC-TLS.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a PQC-TLS protocol is implemented directly, then quantum security is achieved, but compatibility with intermediate devices is lost

Engineering Contradiction:

Improvequantum securityVSAvoidcompatibility with intermediate devices

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent segments the communication channel into two distinct layers: a lower general security channel using traditional TLS protocol that intermediate devices can process, and an upper quantum security channel using PQC-TLS protocol that provides quantum protection. This segmentation allows each layer to serve its specific function independently, resolving the contradiction between security and compatibility.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements nesting by embedding the PQC-TLS quantum security channel within the general TLS security channel structure. The quantum security handshake and encryption operations are nested within the existing TLS framework, allowing intermediate devices to process the outer TLS layer while the inner PQC layer provides additional quantum security protection.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Reliability

If PQC-TLS protocol is deployed universally, then quantum security is ensured, but system complexity and deployment cost increase

Engineering Contradiction:

Improvequantum securityVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies partial action by implementing PQC-TLS only where quantum security is specifically needed, rather than forcing universal deployment. The system allows selective activation of quantum security channels based on requirements, reducing overall system complexity while maintaining security where necessary.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentEP4492731B1Communication method for quantum security and communication device supporting the same

Publication Date: 2025.11.26 SAMSUNG SDS CO LTD

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AI summary

There is provided a communication device. The communication device may comprise one or more processors; a communication interface; and a memory that stores a computer program executed by the one or more processors, wherein the computer program includes instructions for operations of: forming a general security channel according to a first transport layer security (TLS) protocol that does not support a post-quantum cryptography algorithm with another communication device; forming a communication channel of an application layer (L7) with another communication device through the general security channel; forming a quantum security channel by performing a handshake procedure according to a second TLS protocol that supports the post-quantum cryptography algorithm with another communication device through the communication channel; and communicating with another communication device through the quantum security channel.