Satellite secure communication method based on QC-LDPC McEliece cryptosystem

By using the McEliece cryptosystem based on QC-LDPC and combining the design of the generator matrix and the parity check matrix, secure encryption and error correction of information in satellite communication are achieved, solving the problems of information security and reliability in satellite communication, and possessing the characteristics of high security and efficient transmission.

CN119316115BActive Publication Date: 2026-06-09BEIJING INST OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING INST OF TECH
Filing Date
2024-08-29
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

In satellite communications, existing technologies struggle to effectively protect the security of sensitive information while ensuring communication reliability, and the cascaded design of traditional encryption and error correction modules increases system complexity.

Method used

The McEliece cryptosystem based on QC-LDPC is adopted. By constructing the generator matrix G and the parity check matrix H of the QC-LDPC code, and combining them with a pseudo-random number generator to generate pseudo-random sequences and error vectors, encryption and error correction are cascaded. BPSK modulation and AWGN channel transmission are used to ensure the security and reliability of communication.

Benefits of technology

It resists quantum computing attacks, reduces key size, increases transmission rate, and ensures smooth decryption by generating consistent error vectors through pseudo-random sequences, thereby improving the security and efficiency of satellite secure communication.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a satellite security communication method based on a QC-LDPC-based McEliece cryptosystem, and belongs to the technical field of information security. The application analyzes QC-LDPC code characteristics for the QC-LDPC code-based McEliece cryptosystem, and constructs a generation matrix G and a check matrix H of the QC-LDPC code based on a random difference group method. Based on the McEliece cryptosystem, a key for satellite security communication is constructed. The satellite security communication method fusing encryption and error correction is used to realize encryption and error correction cascading for plaintext, and to ensure the security and reliability in the communication process. A pseudo-random sequence is generated by using a pseudo-random number generator linear feedback shift register, an error vector is generated according to the pseudo-random sequence and the check matrix, and a sending message is obtained. A modulation signal is generated by using BPSK modulation. After the modulation signal is transmitted through an AWGN channel, a receiving signal for a satellite security communication receiving end is generated. Decryption and decoding are carried out at the receiving end, and satellite security communication of the QC-LDPC-based McEliece cryptosystem is realized.
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