【摘要】：隨著互聯網及多媒體技術的飛速發(fā)展,視頻安全問題受到社會的普遍關注,人們越來越迫切的需要更加安全的視頻保護機制。偽隨機序列在保密通信及密碼學領域有著廣泛的應用�；煦鐐坞S機序列以其隨機性好、密鑰空間較大等優(yōu)勢,已經成為當前較為熱門的研究課題之一。針對現有偽隨機序列存在安全性較低,密鑰空間較小等不足,本文提出了兩種不同的偽隨機序列算法,并提出偽隨機序列在視頻安全保護中的實施方案。本文的主要研究工作如下:(1)深入分析偽隨機序列的設計思想�？偨Y目前偽隨機序列算法中存在的不足,研究了序列密碼的設計思想,同時分析偽隨機序列產生算法的設計思想,為設計耦合映象格偽隨機序列和基于Chen系統(tǒng)與DNA編碼的偽隨機序列算法提供堅實的理論支撐。(2)首先,本文分析了耦合映象格模型存在的不足,提出了一種改進的耦合映象格模型。該模型從局部反應方程、耦合空間結構兩方面對CML模型進行了優(yōu)化設計,引入新的密鑰參數作為擴倍因子,進一步增大密鑰空間。同時,提出了一種基于耦合映象格的偽隨機序列離散化方案。其次,將耦合映象格產生的偽隨機序列應用于視頻加密算法的設計。通過對CAVLC熵編碼的關鍵語法元素及幀內預測模式設計加密算法,實現對視頻數據的加密。最后,分別對偽隨機序列的安全性以及視頻加密的安全性進行詳細測試與分析,實驗表明,偽隨機序列算法及視頻加密算法均具有較高的安全性。(3)設計了基于Chen系統(tǒng)及DNA編碼的偽隨機序列算法。對Chen系統(tǒng)進行擴展,提出了四維超混沌系統(tǒng)。在偽隨機序列離散算法的設計中,引入DNA編碼的基本思想,通過DNA運算完成偽隨機序列的產生過程。該方案在提高偽隨機序列安全性的同時,進一步擴大了密鑰空間。(4)為了建立多元化視頻安全保護機制,本文在視頻加密算法的基礎上設計了一種聯合水印加密方案。在視頻聯合水印加密方案中,一個視頻序列將被劃分為兩部分,其中一部分用于設計視頻加密算法,另一部分將被用于設計水印算法,二者邏輯上相互獨立。最后,對視頻聯合水印加密方案的安全性進行詳細測試與分析。本文對偽隨機序列算法及視頻安全保護技術展開了深入研究,提出了兩種不同的偽隨機序列算法。同時,針對視頻加密算法不足以完成視頻版權認證的問題,分別設計了兩類不同的視頻安全保護方案。實驗分析表明,本文提出的偽隨機序列算法均具有較高的隨機性,且具有較大的密鑰空間。視頻加密方案及視頻聯合水印加密方案在滿足不同安全性能需求的前提下,具有廣闊的應用前景和實用價值。
[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.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TP309

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本文編號：2399240