伪随机序列新算法及视频安全保护技术研究
发布时间：2019-01-03 10:19
【摘要】：随着互联网及多媒体技术的飞速发展,视频安全问题受到社会的普遍关注,人们越来越迫切的需要更加安全的视频保护机制。伪随机序列在保密通信及密码学领域有着广泛的应用。混沌伪随机序列以其随机性好、密钥空间较大等优势,已经成为当前较为热门的研究课题之一。针对现有伪随机序列存在安全性较低,密钥空间较小等不足,本文提出了两种不同的伪随机序列算法,并提出伪随机序列在视频安全保护中的实施方案。本文的主要研究工作如下:(1)深入分析伪随机序列的设计思想。总结目前伪随机序列算法中存在的不足,研究了序列密码的设计思想,同时分析伪随机序列产生算法的设计思想,为设计耦合映象格伪随机序列和基于Chen系统与DNA编码的伪随机序列算法提供坚实的理论支撑。(2)首先,本文分析了耦合映象格模型存在的不足,提出了一种改进的耦合映象格模型。该模型从局部反应方程、耦合空间结构两方面对CML模型进行了优化设计,引入新的密钥参数作为扩倍因子,进一步增大密钥空间。同时,提出了一种基于耦合映象格的伪随机序列离散化方案。其次,将耦合映象格产生的伪随机序列应用于视频加密算法的设计。通过对CAVLC熵编码的关键语法元素及帧内预测模式设计加密算法,实现对视频数据的加密。最后,分别对伪随机序列的安全性以及视频加密的安全性进行详细测试与分析,实验表明,伪随机序列算法及视频加密算法均具有较高的安全性。(3)设计了基于Chen系统及DNA编码的伪随机序列算法。对Chen系统进行扩展,提出了四维超混沌系统。在伪随机序列离散算法的设计中,引入DNA编码的基本思想,通过DNA运算完成伪随机序列的产生过程。该方案在提高伪随机序列安全性的同时,进一步扩大了密钥空间。(4)为了建立多元化视频安全保护机制,本文在视频加密算法的基础上设计了一种联合水印加密方案。在视频联合水印加密方案中,一个视频序列将被划分为两部分,其中一部分用于设计视频加密算法,另一部分将被用于设计水印算法,二者逻辑上相互独立。最后,对视频联合水印加密方案的安全性进行详细测试与分析。本文对伪随机序列算法及视频安全保护技术展开了深入研究,提出了两种不同的伪随机序列算法。同时,针对视频加密算法不足以完成视频版权认证的问题,分别设计了两类不同的视频安全保护方案。实验分析表明,本文提出的伪随机序列算法均具有较高的随机性,且具有较大的密钥空间。视频加密方案及视频联合水印加密方案在满足不同安全性能需求的前提下,具有广阔的应用前景和实用价值。
[Abstract]:With the rapid development of Internet and multimedia technology, people pay more and more attention to the security of video. Pseudorandom sequences are widely used in the field of secure communication and cryptography. Chaotic pseudorandom sequences have become one of the hot research topics due to their advantages of good randomness and large key space. In view of the shortcomings of the existing pseudorandom sequences such as low security and small key space, two different pseudorandom sequence algorithms are proposed, and the implementation scheme of pseudorandom sequences in video security protection is proposed. The main work of this paper is as follows: (1) the design idea of pseudorandom sequence is deeply analyzed. This paper summarizes the shortcomings of pseudorandom sequence algorithm, studies the design idea of sequence cipher, and analyzes the design idea of pseudorandom sequence generation algorithm. It provides a solid theoretical support for the design of coupled mapping lattice pseudorandom sequences and pseudorandom sequence algorithms based on Chen system and DNA coding. (2) first of all, this paper analyzes the shortcomings of coupled mapping lattice model. An improved coupled mapping lattice model is proposed. The model optimizes the design of CML model from two aspects of local reaction equation and coupling space structure. The new key parameter is introduced as the expansion factor to further increase the key space. At the same time, a scheme for discretization of pseudorandom sequences based on coupled mapping lattices is proposed. Secondly, the pseudorandom sequence generated by coupled image lattice is applied to the design of video encryption algorithm. The encryption algorithm is designed to encrypt the video data by designing the key syntax elements of CAVLC entropy coding and the intra prediction pattern. Finally, the security of pseudorandom sequence and the security of video encryption are tested and analyzed in detail. Both pseudorandom sequence algorithm and video encryption algorithm have high security. (3) A pseudorandom sequence algorithm based on Chen system and DNA coding is designed. The four dimensional hyperchaotic system is proposed by extending the Chen system. In the design of the discrete algorithm of pseudorandom sequence, the basic idea of DNA coding is introduced, and the process of generating pseudorandom sequence is completed by DNA operation. This scheme not only improves the security of pseudorandom sequences, but also expands the key space. (4) in order to establish a multiplex video security protection mechanism, this paper designs a joint watermarking encryption scheme based on the video encryption algorithm. In the video joint watermarking scheme, a video sequence is divided into two parts, one of which is used to design the video encryption algorithm and the other is used to design the watermarking algorithm, which is logically independent of each other. Finally, the security of video joint watermark encryption scheme is tested and analyzed in detail. In this paper, the pseudorandom sequence algorithm and video security protection technology are deeply studied, and two different pseudorandom sequence algorithms are proposed. At the same time, aiming at the problem that video encryption algorithm is not sufficient to complete video copyright authentication, two different video security schemes are designed. The experimental results show that the proposed pseudo-random sequence algorithms have high randomness and large key space. The video encryption scheme and the video joint watermark encryption scheme have broad application prospect and practical value under the premise of meeting the different security performance requirements.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP309
本文编号：2399240
[Abstract]:With the rapid development of Internet and multimedia technology, people pay more and more attention to the security of video. Pseudorandom sequences are widely used in the field of secure communication and cryptography. Chaotic pseudorandom sequences have become one of the hot research topics due to their advantages of good randomness and large key space. In view of the shortcomings of the existing pseudorandom sequences such as low security and small key space, two different pseudorandom sequence algorithms are proposed, and the implementation scheme of pseudorandom sequences in video security protection is proposed. The main work of this paper is as follows: (1) the design idea of pseudorandom sequence is deeply analyzed. This paper summarizes the shortcomings of pseudorandom sequence algorithm, studies the design idea of sequence cipher, and analyzes the design idea of pseudorandom sequence generation algorithm. It provides a solid theoretical support for the design of coupled mapping lattice pseudorandom sequences and pseudorandom sequence algorithms based on Chen system and DNA coding. (2) first of all, this paper analyzes the shortcomings of coupled mapping lattice model. An improved coupled mapping lattice model is proposed. The model optimizes the design of CML model from two aspects of local reaction equation and coupling space structure. The new key parameter is introduced as the expansion factor to further increase the key space. At the same time, a scheme for discretization of pseudorandom sequences based on coupled mapping lattices is proposed. Secondly, the pseudorandom sequence generated by coupled image lattice is applied to the design of video encryption algorithm. The encryption algorithm is designed to encrypt the video data by designing the key syntax elements of CAVLC entropy coding and the intra prediction pattern. Finally, the security of pseudorandom sequence and the security of video encryption are tested and analyzed in detail. Both pseudorandom sequence algorithm and video encryption algorithm have high security. (3) A pseudorandom sequence algorithm based on Chen system and DNA coding is designed. The four dimensional hyperchaotic system is proposed by extending the Chen system. In the design of the discrete algorithm of pseudorandom sequence, the basic idea of DNA coding is introduced, and the process of generating pseudorandom sequence is completed by DNA operation. This scheme not only improves the security of pseudorandom sequences, but also expands the key space. (4) in order to establish a multiplex video security protection mechanism, this paper designs a joint watermarking encryption scheme based on the video encryption algorithm. In the video joint watermarking scheme, a video sequence is divided into two parts, one of which is used to design the video encryption algorithm and the other is used to design the watermarking algorithm, which is logically independent of each other. Finally, the security of video joint watermark encryption scheme is tested and analyzed in detail. In this paper, the pseudorandom sequence algorithm and video security protection technology are deeply studied, and two different pseudorandom sequence algorithms are proposed. At the same time, aiming at the problem that video encryption algorithm is not sufficient to complete video copyright authentication, two different video security schemes are designed. The experimental results show that the proposed pseudo-random sequence algorithms have high randomness and large key space. The video encryption scheme and the video joint watermark encryption scheme have broad application prospect and practical value under the premise of meeting the different security performance requirements.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP309
【参考文献】
相关期刊论文 前2条
1 杜耀刚;胡凡;;基于Simmons门限理论的视频水印算法[J];计算机仿真;2013年05期
2 刘杨;佟晓筠;;A new pseudorandom number generator based on a complex number chaotic equation[J];Chinese Physics B;2012年09期
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