Video encryption method for resisting contour attacks

Abstract

The invention discloses a video encryption method for resisting contour attacks, which comprises the following steps of receiving a video to be encrypted, and decoding a bit stream of the video; dividing the macro block of the current frame into four regions, wherein the macro blocks in each region respectively form a one-dimensional macro block sequence; scrambling the macro block sequence by using chaotic mapping; using a 2D-LSCM for generating chaotic sequences with the number equal to that of non-zero DCT coefficients of the current frame, and conducting exclusive-OR operation encryption on the chaotic sequences and sign bits of the DCT coefficients; and performing partial recoding on syntax elements of the macro block changed by the encryption operation in the to-be-encrypted video toobtain an encrypted video bit stream, thereby finishing encryption. According to the invention, encryption is realized by using optimally designed macro block scrambling, so that various types of existing contour attacks can be effectively resisted. Meanwhile, the encryption key of the method is related to the non-zero DCT coefficient quantity histogram of the video frame to be encrypted, so thatthe known plaintext attack can be effectively resisted.

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/

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