With Internet technology, multimedia technology and the rapid development of network of various multimedia information can be in a different form on the network convenient, fast transmission, people through the multimedia information on a political, economic, military and daily exchange. But, the multimedia information transfer also has huge potential safety problems, some illegal elements through the technical measure filch, malicious damage incidents of multimedia information, multimedia information holders to bring great losses. And digital image is an important part of the multimedia information. The digital image encryption problems, to protect the interests of the digital image holders, promote the harmonious development of economy are of significance. Therefore, how to protect the security of the digital image, has become the focus of attention.
This topic research content is the structure characteristics of the digital image as the foundation, study digital image information security problems. The purpose of this project is to achieve a higher safety of image information security algorithm, so it can realize the digital image encryption and decryption, is a specifically through certain image method makes it become an unrecognizable ciphertext, in the network transmission process not to reveal the original image. There are a variety of image encryption algorithm, the subject of the Hilbert curve and Henon mapping is mixed encryption, and realize the digital image space pixel scrambling and digital image gray transformation. An example shows that encryption image encryption has completely covered with the content of the original image, encryption effect is better, therefore, Henon mapping and Hilbert curve based on the mixture of encryption is a safe, effective and fast encryption calculate
With the the rapid development of the Internet technology, multimedia technology and network, various kinds of multimedia information can be spreaded conveniently and fastly in different forms on the Internet ,and also, daily communication about economic, military and politics can be exchanged through the multimedia information. However, the multimedia information transmission also has great potential security dangers.Some criminals use technical means to steal and destruct multimedia information maliciously ,which brings huge loss to the multimedia information holders. Well,The digital image is an important part of multimedia information. Research on digital image encryption has excellent significance to protect the interests of holders and enhance the harmony of economy society’s development . As a result, how to protect the security of digital image, has gradually become the focus of attention.
The content of the subject is based on the structural features of digital image to research digital image information security. The purpose of this project is to achieve image information security algorithm,which has high security, to the realize of digital image encryption, decryption.That means a clear image can be changed into a unrecognized ciphertext using a certain algorithm to avoid the exposure of the original image during the network transmission. Image encryption has a variety of algorithms, this paper takes the hybrid encryption of Hilbert curve and Henon mapping,and meanwhile, realize changing of spatial pixel scrambling and gray scale of digital image. Encryption example shows that the encrypted image has completely covered the contents of the original image and the encryption effect is good. Therefore, the hybrid encryption based on the Henon mapping and Hilbert curves is a safe, effective, fast encryption method.
Keywords: digital image; image encryption; pixel scrambling; gray transformation; Henon Hilbert curve mapping;
With Internet technology, multimedia technology and the rapid development of network of various multimedia information can be in a different form on the network convenient, fast transmission, people through the multimedia information on a political, economic, military and daily exchange. But, the multimedia information transfer also has huge potential safety problems, some illegal elements through the technical measure filch, malicious damage incidents of multimedia information, multimedia information holders to bring great losses. And digital image is an important part of the multimedia information. The digital image encryption problems, to protect the interests of the digital image holders, promote the harmonious development of economy are of significance. Therefore, how to protect the security of the digital image and gradually become ? people
Along with the quickly development of Internet technology, multimedia technology and the nettwork, various kinds of multimedia information can be conventiently and quickly searched out in different forms on the Internet . People can do lot of things such as the multimedia information, economic, military and political daily communication.
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