Image Encryption with Chaotic System and CML (original) (raw)
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Due to the rise in the use of internet facility for data/information transmission, the data must be kept secured. The data to be transferred can also be an images. So that images being transmitted through the internet must also be kept much secured for gaining the trust from the users. The image encryption can be performed through many ways. The proposed method of image encryption is by mapping with the chaotic maps provided as chaos theory. The original image will be divided in to different blocks, then permute and diffuse separately at the pixel level of each block. Finally combine and diffuse the permuted image as a cipher image. The proposed method also experimented and tested to reach the current need of image encryption to maintain the security among the users.
As we live and revel in a digital age, the day to day transmission of multimedia data over the internet is beyond our imaginations. Consequently, the increased risk of losing or altering the data during transit is more. Protection of this multimedia data (audio/speech, image, and video) becomes one of the major security concerns, because millions of Internet users worldwide, are infringing digital rights daily, by downloading multimedia content illegally from the Internet. The image protection is very important, as the image transmission covers the highest percentage of the multimedia data. Image encryption is one of the ways out to achieve this. Our world, built upon the concept of progression and advancement, has entered a new scientific realm known as Chaos theory. Chaotic encryption is one of the best alternative ways to ensure security. Many image encryption schemes using chaotic maps have been proposed, because of its extreme sensitivity to initial conditions, unpredictability and random like behaviors. Each one of them has its own strength and weakness. In this paper, some existing chaos based colour image encryption schemes are classified and analyzed with respect to various parameters like implementation, key management, security analysis and channel issues to fulfill some basic cryptographic requirements for chaos based image encryption algorithms from the year 2010 to 2014.
An Image Encryption and Decryption using Chaos Algorithm
In a well-developed digital world, security plays a key role in transmission of images. To overcome these challenges Encryption and Decryption techniques need to be applied. In this paper we have applied the chaotic encryption and chaotic decryption on an image by doing pixel shuffling and using chaotic maps. Chaotic nature i.e., randomness property is present in both Henon map and Arnold cat map. Pseudorandom values generation plays an important key role in Henon maps and iteratively pixel shuffling is done in Arnold cat map. A sorting Technique is followed on key values produced by Henon map. By using those sorted positions, shuffle the pixel values generated by Arnold cat map iteratively. In this way the images are provided with high security for confidential transmission.
Image Encryption using Combination of Chaotic
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Security and confidentiality of data or information at the present time has become an important concern. Advanced methods for secure transmission, storage, and retrieval of digital images are increasingly needed for a number of military, medical, homeland security, and other applications. Various kinds of techniques for increase security data or information already is developed, one common way is by cryptographic techniques. Cryptography is science to maintain the security of the message by changing data or information into a different form, so the message cannot be recognized. To compensate for increasing computing speeds increases, it takes more than one encryption algorithm to improve security of digital images. One way is by using algorithms to double cryptography do encryption and decryption. Cryptographic algorithm often used today and the proven strength specially the digital image is Algorithm with Chaos system. To improve security at the image then we use Additional algorit...
Color image encryption based on coupled nonlinear chaotic map
Chaos, Solitons & Fractals, 2009
Image encryption is somehow different from text encryption due to some inherent features of image such as bulk data capacity and high correlation among pixels, which are generally difficult to handle by conventional methods. The desirable cryptographic properties of the chaotic maps such as sensitivity to initial conditions and random-like behavior have attracted the attention of cryptographers to develop new encryption algorithms. Therefore, recent researches of image encryption algorithms have been increasingly based on chaotic systems, though the drawbacks of small key space and weak security in one-dimensional chaotic cryptosystems are obvious. This paper proposes a Coupled Nonlinear Chaotic Map, called CNCM, and a novel chaos-based image encryption algorithm to encrypt color images by using CNCM. The chaotic cryptography technique which used in this paper is a symmetric key cryptography with a stream cipher structure. In order to increase the security of the proposed algorithm, 240 bit-long secret key is used to generate the initial conditions and parameters of the chaotic map by making some algebraic transformations to the key. These transformations as well as the nonlinearity and coupling structure of the CNCM have enhanced the cryptosystem security. For getting higher security and higher complexity, the current paper employs the image size and color components to cryptosystem, thereby significantly increasing the resistance to known/chosen-plaintext attacks. The results of several experimental, statistical analysis and key sensitivity tests show that the proposed image encryption scheme provides an efficient and secure way for real-time image encryption and transmission. (S. Mazloom), eftekhari@qazviniau.ac.ir (A.M. Eftekhari-Moghadam).
A New Image Cryptosystem based on Chaotic
2010
Recently, a variety of chaos-based cryptosystems have been proposed. Some of these novel chaotic encryption schemes are not very suitable for image encryption due to their density function which is not uniformly distributed or due to their small key space. In this paper, we propose a new scheme for image encryption based on the use of a chaotic map with large key space and Engle Continued Fractions (ECF) map. The ECF-map is employed to generate a pseudo ran-dom sequence which satisfies uniform distribution, zero co-correlation and ideal nonlinearity to achieve higher level of security. The proposed scheme is resistant to the known at-tacks. Theoretic and numerical simulation analyses indicate that our scheme is efficient and satisfies high security.