Encrypted embedded video chaotic secret communication method after H.264 coding

Abstract

The invention discloses an encrypted embedded video chaotic secret communication method after H.264 coding. The encrypted embedded video chaotic secret communication method comprises the following steps of S1, at a transmitting end, performing H.264 hardware coding, chaotic flow password encryption, pixel-position chaotic scrambling encryption, network transmission and wide-area network transmission on video data; and S2, at a receiving end, receiving encrypted video data through the network, finishing pixel-position chaotic descrambling decryption and chaotic flow cipher decryption, realizing H.264 hardware decoding on the condition that a password matches, and stopping communication between the transmitting end and the receiving end after H.264 hardware decoding failure on the condition that password mismatching occurs. The encrypted embedded video chaotic secret communication method has double encryptions, namely chaotic flow password encryption and chaotic position scrambling encryption. The double encryptions are performed after H.264 coding compression. The encrypted embedded video chaotic secret communication method has advantages of realizing no damage of original video correlation, improving coding efficiency, reducing data redundancy, and realizing high real-time performance and high safety of an encryption system.

Description

technical field [0001] The invention relates to video security communication technology in multimedia communication, in particular to an embedded video chaos security communication method encrypted after H.264 encoding. Background technique [0002] In video chaotic secure communication, there are currently two chaotic encryption methods widely used by people: [0003] The first way is to encrypt first and then perform H.264 or HEVC encoding and compression. The characteristic of this encryption method is that it is more convenient to deal with at the technical level, but it has the following shortcomings: [0004] 1. After chaotic encryption, the correlation of the original video is disrupted, resulting in a greatly reduced encoding and compression efficiency of H.264, and the amount of encoded video data is large. Whether H.264 hardware encoding or software encoding is used, the encrypted video The transmission rate via Ethernet is not high enough; the image data volume i...

AI Technical Summary

Problems solved by technology

[0004] 1. After chaotic encryption, the correlation of the original video is disrupted, resulting in a greatly reduced encoding and compression efficiency of H.264, and the amount of encoded video data is large. Whether H.264 hardware encoding or software encoding is used, the encrypted video The transmission rate via Ethernet is not high enough; the image data volume in RGB format is much larger than the I frame or P frame data volume after H.264 compression. 264 compressed to KB level

The amount of encrypted data is large, and the encryption takes a long time;

[0005] 2. The encoding efficiency is low. The H.264 encoder relies on the spatial correlation of the image to compress to obtain I frames, and relies on the temporal correlation between frames to compress to obtain P frames.

However, the spatial-temporal correlation of the encrypted RGB image pixels is disrupted, which seriously affects the efficiency of the encoder, which is reflected in the greatly reduced encoding compression rate;

[0006] 3. Low transmission efficiency

The low compression efficiency of H.264 leads to a large amount of data in the H.264 video signal. When the network transmission bandwidth is constant, the transmission frame rate decreases;

[0007] 4. Only the encryption method of position scrambling can be used, and the size of video pixels cannot be encrypted. Otherwise, due to the quantization in H.264, the receiving end will not be able to decrypt correctly even if the key matches. The original video, but only the encryption method of position scrambling, the statistical characteristics are not good, and the security performance is not high

[0010] 2. Low operating efficiency

The execution speed of software is much lower than that of hardware, so the operating efficiency is low

The selective encryption scheme can only transplant the encryption algorithm based on the H.264 codec open source code, but cannot transplant the encryption algorithm based on the hardware codec circuit. Therefore, this scheme cannot utilize the hardware resources in the chip, and the encoding operation efficiency is low.

[0011] 3. The design is difficult

The H.264 encoding process is complicated, with many variables and branches. It is quite difficult to accurately encrypt the corresponding variables and decrypt them accurately;

[0012] 4. At present, mobile phones and other mobile terminals mainly use H.264 hardware encoding and compression, but it is still difficult to complete selective chaotic encryption on the basis of H.264 hardware encoding.

[0014] 1. The data size of each frame of video stream after H.264 compression is variable, so it is difficult to use a set of scrambling parameters for scrambling encryption, but it is impossible to use countless sets of scrambling parameters for encryption;

[0015] 2. The size of each frame of H.264 video stream must meet the requirements of extending into a regular m×n order matrix in units of 3 bytes, so as to meet the conditions of scrambling and encryption, and the video stream obtained by H.264 compression The length cannot be guaranteed to meet this requirement;

[0016] 3. Stream cipher encryption will destroy part of the data in the H.264 video stream during the self-synchronization process. Because of the strict syntax of H.264, even one bit of data damage will cause decoding failure and interrupt the normal video communication

There are security and efficiency deficiencies in encrypting first and then encoding

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