Research on Secure and Reliable Communications Method Based on LDPC Codes

Low-density parity-check (LDPC) codes are a class of linear block codes defined by the check matrix, which have the error-correcting capability of approaching Shannon limit. Based on the symmetric cryptosystem with error correcting codes as well as performance equivalent coding matrix, this paper proposes a secure communication method based on LDPC codes. This method greatly improves the anti-intercept capability of system and keeps the reliability almost unchanged by constructing a large number of performance equivalent coding matrixes and by simultaneously and randomly shifting the coding matrixes by the sender and receiver. Thus the proposed method has better error-correcting capability and can be applied as a secure and reliable integrated communication solution.