A Streaming Media Secure Transmission Method Based on Error Diffusion and Noise Aggregation

Abstract

The invention discloses a streaming media security transmission method based on error diffusion and noise aggregation, and a physical layer encryption method of joint network coding and feedback retransmission is designed by using independent group correlation, and the legitimate sending end performs physical encryption through XOR correlation. Layer coding, so that the confidential data of different time slots are not directly exposed in the wireless channel. On the illegal eavesdropping side, once a data packet error occurs in any odd time slot before, it will directly affect the decoding of all future confidential data, thus ensuring the security of confidential information transmission. Compared with the original noise aggregation, the proposed scheme can provide higher security with the same coding complexity.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a stream media secure transmission method based on error diffusion and noise aggregation. Background technique [0002] With the continuous innovation of wireless communication technology, diversified mobile services have been integrated into people's lives. However, the inherent openness of the wireless propagation environment makes communication systems always face security threats. Based on cryptography theory, traditional security mechanisms ensure the safe transmission of information by encrypting data with a secret key. In recent years, high-performance chips are developing rapidly, and the traditional encryption mechanism based on computational complexity is facing great challenges. The proposal of physical layer security technology provides a new direction for solving the security transmission in wireless communication. Different from the sec...

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Problems solved by technology

[0004] Existing noise aggregation schemes can bring a 1dB SNR gain to legitimate receivers at the bit error rate level, but this is slightly insufficient for the usual security requirements

In addition, in the noise aggregation scheme, the data packets that are used as dynamic secret keys and reliably transmitted are exposed in the wireless channel without encryption, which also makes it possible for eavesdroppers to directly and correctly decode such data packets or even other data packets through other techniques such as time diversity

And noise aggregation can only aggregate the noise of odd-numbered packets to the next even-numbered packet, and the aggregation depth is low

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