A Video Encryption Method Against Contour Attack

Abstract

The invention discloses a video encryption method for resisting contour attacks, comprising: receiving a video to be encrypted, and decoding the bit stream of the video; dividing the macro block of the current frame into four areas, each area The macroblocks of each form a one-dimensional macroblock sequence; use the chaotic map to scramble the macroblock sequence; use 2D-LSCM to generate a chaotic sequence equal to the number of non-zero DCT coefficients in the current frame, and combine the chaotic sequence and the DCT coefficient The sign bit is encrypted by XOR operation; the syntactic elements of the macroblock changed by the encryption operation in the video to be encrypted are partially re-encoded to obtain the encrypted video bit stream, and the encryption is completed. Since the present invention implements encryption by using optimally designed macro block scrambling, it can effectively resist existing various types of contour attacks. At the same time, the encryption key of this method is related to the histogram of the number of non-zero DCT coefficients of the video frame to be encrypted, which can effectively resist the known plaintext attack.

Description

technical field [0001] The invention relates to the technical field of multimedia information security, in particular to a video encryption method for resisting contour attacks. Background technique [0002] With the advancement of digital video processing technology and the rapid development of the Internet, video, as a carrier containing rich information, has been widely used. Therefore, how to effectively protect the security and privacy of commercial or personal videos transmitted through open channels or stored in cloud storage platforms has attracted more and more attention. [0003] Video encryption is a common method for securing video content. The encryption algorithm can convert a plaintext video into a noise-like ciphertext video under the control of the key, so that only legitimate users with the key can obtain the original content of the video, while illegal users without the key can only obtain the original content of the video. Get cluttered and noisy conten...

AI Technical Summary

Problems solved by technology

[0006] H.264 / AVC video encryption method based on encrypted intra prediction mode, motion vector difference and DCT coefficient proposed by Peng et al. (F.Peng, X.-q.Gong, M.Long, and X.-m. Sun, "A selective encryption scheme for protecting H.264 / AVC video in multimedia social network," Multimedia Tools and Applications, vol.76, no.3, pp.3235–3253, 2017) and Ding et al. based on changing DCT H.264 / AVC video encryption method of coefficient scan order (X.Ding, Y.Deng, G.Yang, Y.Song, D.He, and X.Sun, "Design of new scan orders for perceptual encryption of H.264 / AVC videos, "IET Information Security., vol.11, no.2, pp.55–65, 2017) are unable to resist MBS contour attacks and some traditional contour attacks on JPEG images

In addition, the visual effects of these encryption methods are not ideal

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