Feedback-Based Seed Updating for Secure Message Transmission
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Solution Overview
Problem
Existing secure transmission methods rely on key-based encryption, which are vulnerable to non-target receiving nodes due to complex key management protocols, and cannot secure messages transmitted before key agreement.
Innovation Solution
A communication method that uses random seeds for security processing, updating the seed only when feedback confirms correct message receipt, preventing errors from spreading and enhancing message security without affecting performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If key-based encryption is used for secure transmission, then message confidentiality is improved, but key management complexity increases and vulnerabilities to non-target receiving nodes arise
Solution Approach 1:
The patent extracts the security function from traditional key-based encryption by using a randomness extractor to generate random seeds directly from channel noise. This eliminates the need for complex key management protocols while maintaining message confidentiality, as the random seeds are generated independently for each transmission without requiring shared secret keys between communicating parties.
Solution Approach 2:
The patent introduces channel noise as an intermediary element that serves as the foundation for generating random seeds. Instead of directly managing encryption keys, the system uses the inherent randomness in channel noise as a mediator to establish secure communication, thereby simplifying key management while preserving confidentiality.
2Reliability
If random seed updating is performed after every message transmission, then message security against non-target nodes is improved, but communication overhead and processing time increase
Solution Approach 1:
The patent applies partial updating of random seeds by using the same seed for multiple messages when channel conditions remain stable, and only updating when feedback indicates successful reception or channel conditions change. This partial action approach maintains security against non-target nodes while reducing the excessive overhead of updating after every single message transmission.
Solution Approach 2:
The patent implements feedback-based random seed updating where the transmitter adjusts whether to update the random seed based on feedback from the receiver about successful message reception. This feedback mechanism allows the system to maintain security only when necessary, reducing communication overhead while preserving message security against non-target nodes.
3Reliability
If channel noise entropy is accumulated between code blocks, then error spreading is prevented and message security is improved, but processing complexity increases
Solution Approach 1:
The patent segments the message into multiple code blocks and applies different random seed processing to each segment. By accumulating channel noise entropy between these segmented code blocks rather than processing the entire message uniformly, the system prevents error spreading while maintaining manageable processing complexity through localized operations on individual segments.
Solution Approach 2:
The patent applies local quality by using different random seed values for different code blocks based on local channel conditions. Each code block is processed with quality tailored to its specific position and channel characteristics, preventing error spreading locally while avoiding the complexity of global reprocessing of entire messages.
Data Source
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AI summary
This application discloses a communication method and apparatus. The method includes: A first apparatus performs security processing on a first message based on a first random seed, to obtain a second message. After obtaining a third message based on the second message, the first apparatus sends the third message to a second apparatus. If the first apparatus receives feedback information from the second apparatus, the first apparatus updates the first random seed to a second random seed, where the feedback information indicates that the second apparatus correctly receives the third message. According to the method, the first apparatus updates the first random seed only when the second apparatus correctly receives the third message, thereby preventing errors from spreading on a link between the first apparatus and the second apparatus. This ensures performance of communication between the first apparatus and the second apparatus while blocking non-target receiving nodes from correctly receiving the third message, thus enhancing message security.