【作者】 曹晓华；

【导师】 杨艳；

【作者基本信息】 东北大学 ， 软件工程， 2008， 硕士

【摘要】 随着Internet技术与多媒体技术的飞速发展和广泛应用,越来越多的信息能够在网络上迅速方便的传输,与此同时,信息的安全隐患也日趋严峻。如何保护信息安全已经成为国际上研究的热点。密码技术是保护信息安全的有效手段,已经成为一项非常实用又急需快速发展的关键技术。但是,一方面现有的加密算法大多数是为保护文本信息而设计的,另一方面已有加密算法的抗破译能力不强。传统的加密算法应用于图像加密有诸多弊端,因此大量针对图像特点的加密方案被提出。本文围绕混沌技术在数字图像加密中的应用这一课题,进行了较为广泛而深入的研究。针对所提出的图像加密算法,本文从安全性、密钥敏感性、图像恢复性、置乱度、直方图、和稳定性方面对其进行了分析。结果表明,所提出的算法能有效的对图像进行加密和解密,置乱效果很好,解密无失真,执行速度快,同时具有一定的抗破损攻击和抗噪声能力,具有较好的稳定性。理论分析和实验结果均表明文中提出的图像加密方案是可靠安全的加密系统。更多还原

【Abstract】 With the rapid development and wide applications of Internet technology and media technology,more and more information has been quickly and conveniently transmitted through the network,at the same time there arouses the potential problems of the information security.Therefore,how to protect information security has become a hot topic. Encryption technology is the best method to protect information security, which is greatly practical and urgent to develop key technology.However,on one side,most encryption methods are designed for text information; on the other side,some encryption schemes are easily to be attacked. There are manydisadvantages in traditional encryptions, and a lot of encryptions for images are put forward . In fact,there are more or less disadvantages in one signal encryption.This paper studies on chaotic technology and its application in digital image encryption.This paper analyses the image encryption algorithms from these aspects,including sensitive dependence on the key,capability of image resume,confusion degree,histogram and stability. The conclusion can be drawn that these algorithms canencrypt/decrypt image effectively,with the good effect of confusion,no distortiondecrypted and high speed execution. At the same time,algorithms have the certainability against destroying and noise.Theoretical analysis and experimental results show that the proposed text of the image encryption scheme is reliable and secure encryption system..更多还原