Semantic Security via Artificial Noise in Communications
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Solution Overview
Problem
Current communication systems lack flexible and scalable solutions for achieving information-theoretic semantic security, which is essential for post-quantum cryptography, as existing methods are either rigid, non-flexible, or require significant architectural changes, and do not effectively integrate with existing technologies or channel conditions.
Innovation Solution
A security module that adds artificial noise to communication signals, using an artificial-noise-generating component to ensure that messages remain readable for intended recipients while becoming unreadable for eavesdroppers, even if they apply any operation, by leveraging differences in noise levels between communication channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Quantum Key Distribution (QKD) is implemented to achieve information-theoretic security, then security strength is improved, but device complexity and infrastructure requirements increase significantly
Solution Approach 1:
The patent replaces the mechanical/physical QKD infrastructure (quantum channels, trusted nodes, dedicated hardware) with an information-theoretic security scheme based on wiretap channel coding. This substitutes complex physical security mechanisms with mathematical coding theory applied to existing communication channels, achieving the same security goal without the infrastructure overhead.
Solution Approach 2:
The invention makes security functionality universal by designing a wiretap channel coding scheme that can be applied to any existing communication channel without requiring dedicated quantum infrastructure. The same coding framework works across different channel types and existing communication systems, making security multi-functional and infrastructure-agnostic.
2Reliability
If wiretap code constructions are applied to achieve semantic security, then security is improved, but adaptability to existing communication infrastructure deteriorates
Solution Approach 1:
The patent segments the security function into a modular wiretap channel coding layer that can be independently applied to existing communication systems. By separating the security coding from the underlying communication infrastructure, the solution achieves semantic security while maintaining adaptability to various existing systems through standardized interface layers.
Solution Approach 2:
The invention achieves adaptability by parameterizing the wiretap channel coding scheme to match different communication channel characteristics. The coding parameters (code rate, block length, etc.) can be adjusted based on the specific channel conditions and security requirements, allowing the same fundamental approach to work across diverse existing communication infrastructures.
3Reliability
If rigid and non-flexible wiretap code constructions are used, then semantic security is achieved, but ease of operation and implementation deteriorates
Solution Approach 1:
The patent introduces dynamics into the wiretap channel coding scheme by making the coding parameters adjustable and adaptable to different operational conditions. The code rate, block length, and other parameters can be dynamically changed based on channel conditions and security requirements, transforming a rigid construction into a flexible system that maintains semantic security while being easy to operate.
Data Source
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AI summary
The invention disclosed techniques for enhancing a security level of a communication signal, comprising the following steps: • receiving a message m as input data; • adding artificial noise of a level NArt according to a function f-1(m) to the message m so that o after a transmission of the communication signal x over a communication channel T with a noise level NT to a receiver that transforms the communication signal x to the communication signal y, the message remains readable to the receiver; o after a transmission of the communication signal x over a communication channel E with a noise level NE to an eavesdropper that transforms the communication signal x to the communication signal z, the message gets unreadable to the eavesdropper.