请将下面这段英语精简为300个英语字母以内的句子：This paper proposes a video security transmission enhancement algorithm based on block permutation and dynamic multiplexing sequences encryption based on 4D autonomous hyperch

This paper proposes a video security transmission algorithm based on block permutation and dynamic multiplexing sequences encryption using a 4D autonomous hyperchaotic system. It employs block permutation and diffusion confusion encryption module to encrypt the plaintext and obtain the ciphertext. The hash value of the ciphertext is used to generate a chaotic key for the next round. The chaotic key is used to confuse the N-th of the multiplexed sequence and obtain the next round of multiplexed sequence. If the current round of chaotic sequence is completely confused, a new multiplex sequence is generated using the current round key and the initial key. This process is repeated for each frame of the video. Compared to traditional permutation coding algorithm, it increases the difficulty of estimation or recognition while ensuring efficiency and improves the avalanche effect of the algorithm. It has the ability to resist known plaintext attack and selected plaintext attack through frame by frame feedback. The results show that the scheme has high security, significant diffusion characteristics, and can effectively resist various cryptographic attacks