Secure Optical Communication Encoding via Random Number Segmentation
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Solution Overview
Problem
The existing secure optical communication methods using fluctuations for improving security in communication channels face practical challenges due to the heavy process required for bit error correction in receivers, which hampers their introduction into actual systems, despite offering excellent security through unpredictability of fluctuations.
Innovation Solution
A communication system and transmitter-receiver configuration that employs a common key to encode and decode random number sequences into multiple series, using error-correcting codes to control bit errors, making it difficult for unauthorized recipients to correct errors while allowing authorized recipients to easily correct bit errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the secure optical communication method using fluctuations is employed, then security is improved, but the process complexity increases due to exhaustive basis correction
Solution Approach 1:
The random number sequence is divided into multiple random number series based on the common key, where each series is encoded independently with parity check symbols. This segmentation allows the receiver to process and correct errors in each series separately, avoiding the need for exhaustive basis correction across the entire sequence, thus reducing process complexity while maintaining security.
Solution Approach 2:
The common key is used in advance to determine the division of the random number sequence into multiple series and to establish the correspondence between basis values and series. This preliminary action enables the receiver to efficiently identify and correct basis judgment errors without exhaustive searching, resolving the contradiction between security and process complexity.
2Reliability
If redundancy is increased in encoding to correct bit errors, then error correction capability is improved, but encoding efficiency is lowered and secret capacity is reduced
Solution Approach 1:
Parity check symbols are added locally to each random number series independently, providing error correction capability specific to each series. This localized approach ensures that error correction is applied only where needed in each series, maintaining encoding efficiency and secret capacity while providing sufficient error correction capability for secure communication.
3Reliability
If the exhaustive basis correction process is performed, then basis judgment errors are corrected, but the processing time increases significantly
Solution Approach 1:
The random number sequence is segmented into multiple series, allowing the receiver to check parities and correct basis judgment errors in each series independently and in parallel. This segmentation dramatically reduces the processing time compared to exhaustive correction of the entire sequence, while still ensuring high basis judgment accuracy through systematic error correction.
Solution Approach 2:
Parity check symbols are transmitted along with each random number series, providing feedback information that enables the receiver to detect and correct basis judgment errors efficiently. This feedback mechanism eliminates the need for time-consuming exhaustive searching, resolving the contradiction between accuracy and processing time.
Data Source
AI summary
The objective of the invention is to provide an encoding method and a communication method wherein bit-error correction is easy for a authorized recipient but difficult for an unauthorized recipient. A transmission channel in which bit errors are moderately controlled is used to transmit/receive a random number sequence. A common key is shared between a transmitter and a receiver in advance; each bit value of the common key is connected with each slot of the random number sequence; the common key is used to divide the random number sequence into two or more random number series in accordance with the connection; and each random number series is independently encoded and parity check symbols are generated. The unit of the encoding is equal to or greater than the length of the common key so as to make a partial analysis by an unauthorized recipient impossible.