A Novel Image Encryption Approach for Cloud Computing Applications (original) (raw)
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Numerous methods have been recently proposed in the literature for the encryption of 2-D information using optical systems based on the Fractional Fourier Transform. Encryption is one of the well known techniques to provide security in transmission of multimedia contents over the internet and wireless networks. There is a vast use of image in all areas so its security is of great concern nowadays. Discrete Fractional Fourier Transform (DFRFT) generalization of the Discrete Fourier transform (DFT) with an additional parameter is incorporated in image encryption to achieve a more robust encryption system. To focus on security aspect, in this paper a novel method of image encryption has been proposed based on discrete Fractional Fourier Transform (DFRFT), using exponential random phase mask. Encryption with this technique makes it almost impossible to retrieve an image without using both the correct keys. The technique has been implemented experimentally and parameters like security, sensitivity and mean square error (MSE) are discussed. Keywords Fourier Transform (FT); Discrete Fourier Transform (DFT); Fractionl Fourier Transform (FRFT); Discrete Fractional Fourier Transform (DFRFT).
A Novel Image Encryption Scheme based on Multiple Parameter Discrete Fractional Fourier Transform
International Journal of Computer Applications, 2014
Security is one of the most challenging aspects in internet and Multimedia applications. Encryption is a process which is used to secure data. The Encryption algorithms and suitable transforms play a crucial role to form efficient security systems. In this regard the original information in the existing security system based on the fractional Fourier transform (FRFT) is protected by only a certain order of FRFT. In this paper, we propose a novel method to encrypt an image by using multiple parameters discrete fractional Fourier transform (DFRFT) with random phase matrices. The multiple-parameter discrete fractional Fourier transform (MPDFRFT) possesses all the desired properties of discrete fractional Fourier transform. The MPDFRFT converts to the DFRFT when all of its order parameters are the same. We exploit the properties of multiple-parameter DFRFT and propose a novel encryption scheme using the double random phase in the MPDFRFT domain for encrypting digital data. The proposed encoding scheme with MPDFRFT significantly enhances the data security compared to DFRFT and FRFT and it shows consistent performance with different images. The scheme offers a high degree of resistance towards bruteforce attack.
Image Encryption Based on Multi-Order Fractional Fourier Transform
Al-Azhar Engineering Journal, 2014
Encryption technology has been developed quickly and many image encryption methods have been used to protect confidential image data from unauthorized access. In this paper, we introduce general quick brief introduction about cryptography, and then propose a technique for image encryption/decryption by using the nature of FrFT in signals analysis, without use of special methods of encryption algorithms, based on multi-order Fractional Fourier Transform. Taking into account the security of the method used in the encryption work. In this research was to identify indicators to measure the security of the encryption Techniques: (i) sensitivity proposed Techniques for the encryption key can not get the original data only in the presence of this key, (ii) The complexity of the processes that are form internal proposed methods for encryption and decryption processes, and (iii) statistical analysis has been performed by calculating the histograms analysis, comparing with traditional Fourier transform the security system based on the fractional Fourier transform is protected by order of FrFT, it is can provides additional keys for encryption to make it more difficult to break. The keg is formed by combination of order of Fractional Fourier Transform and the matrix. Then, the encrypted image is obtained by the summation of different orders. Numerical simulation results are given to demonstrate this proposed method.
Image encryption and decryption using fractional Fourier transform and radial Hilbert transform
Optics and Lasers in Engineering, 2008
A technique for image encryption using fractional Fourier transform (FRT) and radial Hilbert transform (RHT) is proposed. The spatial frequency spectrum of the image to be encrypted is first segregated into two parts/channels using RHT, and image subtraction technique. Each of these channels is encrypted independently using double random phase encoding in the FRT domain. The different fractional orders and random phase masks used during the process of encryption and decryption are the keys to enhance the security of the proposed system. The algorithms to implement the proposed encryption and decryption scheme are discussed, and results of digital simulation are presented.
Image encryption and the fractional Fourier transform
Optik, 2003
A number of method have been recently proposed in the literature for the encryption of 2-D information using optical systems based on the fractional Fourier fransform, FRT. In this paper a brief review of the methods proposed to date is presented. A measure of the strength/robustness of the level of encryption of the various techniques is proposed and a comparison is carried out between the methods. Optical implementations are discussed. Robustness of system with respect to misalignment and blind decryption are also discussed.
Fractional Fourier plane image encryption technique using radial hilbert-, and Jigsaw transform
Optics and Lasers in Engineering, 2010
A new method for image encryption using integral order radial Hilbert transform (RHT) filter in the fractional Fourier transform (FRT) domain has been proposed. The technique is implemented using the popular double random phase encoding method in the fractional Fourier domain. The random phase masks (RPMs), integral orders of the RHT, fractional orders of FRT, and indices of the Jigsaw transform (JT) have been used as keys for encryption and decryption. Simulation results have been presented and the schematic representation for optical implementation has been proposed. The mean-square-error and signal-to-noise ratio between the decrypted image and the input image have been calculated for the correct as well as incorrect orders of the RHT. Effect of occlusion and noise on the performance of the proposed scheme has also been studied. The robustness of the technique has been verified against attack using partial windows of the correct random phase masks. Similar investigations have also been carried out for the chosen-, and the known-plain-text attacks.
Optical image encryption based on multifractional Fourier transforms
Optics Letters, 2000
We propose a new image encryption algorithm based on a generalized fractional Fourier transform, to which we refer as a multifractional Fourier transform. We encrypt the input image simply by performing the multifractional Fourier transform with two keys. Numerical simulation results are given to verify the algorithm, and an optical implementation setup is also suggested.
Double image encryption based on iterative fractional Fourier transform
Optics communications, 2007
We present an image encryption algorithm to simultaneously encrypt two images into a single one as the amplitudes of fractional Fourier transform with different orders. From the encrypted image we can get two original images independently by fractional Fourier transforms with two different fractional orders. This algorithm can be independent of additional random phases as the encryption/ decryption keys. Numerical results are given to analyze the capability of this proposed method. A possible extension to multi-image encryption with a fractional order multiplexing scheme has also been given.
Optics Communications, 2010
In recent years, the chaos-based cryptographic algorithms have suggested some new and efficient ways to develop secure image encryption techniques. In this paper, we propose a new approach for image encryption based on the multiple-parameter discrete fractional Fourier transform and chaotic logistic maps in order to meet the requirements of the secure image transmission. In the proposed image encryption scheme, the image is encrypted by juxtaposition of sections of the image in the multiple-parameter discrete fractional Fourier domains and the alignment of sections is determined by chaotic logistic maps. This method does not require the use of phase keys. The new method has been compared with several existing methods and shows comparable or superior robustness to blind decryption.