發(fā)布時(shí)間：2018-11-19 11:24

【摘要】：近年來(lái),隨著計(jì)算機(jī)技術(shù)以及多媒體應(yīng)用的飛速發(fā)展,各種各樣的信息得以在網(wǎng)絡(luò)上廣泛傳播,在信息傳播越來(lái)越便捷的同時(shí),隨之而來(lái)的則是傳播過(guò)程中所帶來(lái)的各種安全問(wèn)題,信息安全問(wèn)題逐漸涉及到國(guó)家的政治、軍事、經(jīng)濟(jì)以及文體教育等越來(lái)越多的領(lǐng)域。如果不能很好的解決這些問(wèn)題,將會(huì)直接危及到國(guó)家的經(jīng)濟(jì)、金融、政治以及國(guó)防安全等一系列不穩(wěn)定因素。在各種形式的信息傳播方式中,圖像信息是人們現(xiàn)如今獲取信息的主要方式,自然而然數(shù)字圖像信息傳輸?shù)陌踩珕?wèn)題就成為信息安全方面的重中之重。由于數(shù)字圖像本身具備的信息量龐大以及高冗余度等特點(diǎn)。所以在跟普通的文本數(shù)據(jù)相比較來(lái)說(shuō),一般的傳統(tǒng)加密算法在對(duì)數(shù)字圖像信息進(jìn)行加密的過(guò)程中并不完全適合。同時(shí),隨著密碼學(xué)的快速發(fā)展和計(jì)算機(jī)技術(shù)的不斷完善,各種截獲加密信息的方法也在不斷改進(jìn),也使得一些傳統(tǒng)的加密方法更容易被破解。所以信息獲取者就需要使用更為安全的加密技術(shù)對(duì)存在的圖像信息進(jìn)行加密處理。本文主要研究如何提高數(shù)字圖像在信息傳播過(guò)程中的安全保密問(wèn)題。由于混沌有著確定性、有界性、對(duì)開(kāi)始的值的極端敏感性、長(zhǎng)期不可估算性等良好的特性,使得混沌在圖像數(shù)據(jù)的加密、通信的保密方面、計(jì)算機(jī)的圖形處理、信號(hào)處理以及信號(hào)傳輸以及機(jī)械控制系統(tǒng)的優(yōu)化等方向都有極其廣泛的應(yīng)用。本文在研究總結(jié)前人對(duì)混沌加密研究的基礎(chǔ)上,在驗(yàn)證了 m序列作為圖像加密密鑰的各類優(yōu)勢(shì)的前提下,提出了一種基于m序列與logistic混沌映射相結(jié)合的新的圖像加密算法。并通過(guò)Matlab對(duì)該算法進(jìn)行了仿真實(shí)驗(yàn),驗(yàn)證了它的可行性。并通過(guò)對(duì)加密效果的分析,證明了此種算法有較好的防攻擊能力,在保密效果以及防護(hù)能力上要好于單獨(dú)的m序列加密。
[Abstract]:In recent years, with the rapid development of computer technology and multimedia applications, all kinds of information can be widely spread on the network. The information security problems gradually involve more and more fields such as politics, military affairs, economy and cultural education. If these problems are not solved well, they will directly endanger the country's economic, financial, political and national defense security and a series of unstable factors. In various forms of information transmission, image information is the main way for people to obtain information nowadays. Naturally, the security of digital image information transmission becomes the most important aspect of information security. Digital image itself has the characteristics of huge amount of information and high redundancy. Therefore, compared with the common text data, the traditional encryption algorithm is not suitable for the encryption of digital image information. At the same time, with the rapid development of cryptography and the continuous improvement of computer technology, various methods of intercepting encrypted information are constantly improved, which makes some traditional encryption methods easier to be cracked. Therefore, information acquirers need to use more secure encryption technology to encrypt the existing image information. This paper focuses on how to improve the security and confidentiality of digital images in the process of information transmission. Because of its good properties such as certainty, boundedness, extreme sensitivity to the initial value, long-term inestimability and so on, chaos makes chaos in image data encryption, communication security, computer graphics processing, and so on. Signal processing, signal transmission and optimization of mechanical control system are widely used. On the basis of summarizing the previous researches on chaotic encryption and verifying the advantages of m sequences as image encryption keys, a new image encryption algorithm based on m sequence and logistic chaotic mapping is proposed in this paper. The feasibility of the algorithm is verified by Matlab simulation. Through the analysis of the encryption effect, it is proved that this algorithm has better anti-attack ability and is better than the single m-sequence encryption in the security effect and protection ability.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TP309.7

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本文編號(hào)：2342157