International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 05 | May -2017
p-ISSN: 2395-0072
www.irjet.net
Color Image Encryption and Decryption by Using Chaotic Baker Map Bit Interleaver (1)SAFA
AHMED ABED ALABASS, (2)MORTADA ABDULRAHEEM HAYDER, (3)ZAID SALAH ABDUlSATTAR, (4)OLA HAMZA RASOOL, (5)MARWAH ADIL HASAN
1*Assistant
Lecturer, Dep. of Communication Engineering , Al-Hussain University College, Karbala, Iraq. 2 Laboratory of computer management, University of Karbala, Karbala, Iraq. 3,4 Scientific Affairs, University of Karbala, Karbala, Iraq. 5 B.Sc student, Al-Hussain University College, Karbala, Iraq. ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract- With the progress in communication
In recent years, a number of digital chaotic cryptographic schemes have been proposed [1-8]. In [2], 3D cat map was employed to shuffle the positions of Image pixels, and another chaotic map was used to confuse the relationship between the cipher-image and the plainimage. In this way, the resistance to statistical and differential attacks is significantly increased. In [4], a baker map was used to speed up image encryption while retaining its high degree of security. A chaotic key-based algorithm for image encryption was developed [5]. According to a binary sequence generated from a chaotic map, the pixel of image was XOR-ed or XNOR-ed to the predetermined keys. A method that can provide more than one level of decryption and can solve the trade-off between the encryption speed and the security level for JPEG2000 image was proposed [6]. The permutation of pixels, the substitution of gray level values, and the diffusion of the discretized chaotic map can encrypt an image effectively [7, 8]. In [9], a systematic procedure to create chaos cipher was proposed; the author claimed that their ciphers are resistant to known attacks. This paper proposes an improved chaotic Baker map based on reference [7, 8] in order to encrypt bulk size images. The cipher key can be any integer rather than those divides pixel number in a row/column in a square image. This improvement can achieve high encryption efficiency. We also proposed to use different keys on bit of image, so that there is a large cipher key space, which makes the encrypted image more resistive to exhaustive search.
technology, the necessity of information security has become a global issue. Due to advancement in multimedia application, security becomes an important issue of communication and storage of data. This paper studies the encryption approach for color images. The proposed approach in the paper is based on the chaotic Baker map. The improvement encryption of image by applying the chaotic baker map on bit, which achieves high encryption efficiency. Simulation and statistical analysis show that this approach works well. Here MATLAB is used to design and implement the algorithm. Key Words: Chaotic Baker Map, Chaotic Baker Map pixel interleaver, Chaotic Baker Map bit interleaver.
INTRODUCTION With the special and reliable security in the transmission and storage of images is needed in several applications like pay TV, biometric images or medical for transmission or storage, confidential video conferencing over optical fiber, military applications, police identification procedures, online banking systems, governmental services, identity (ID) cards, etc. Generally speaking, there are two major approaches that are used to protect digital image. One is information hiding such as digital watermarking of image/video. The other is image encryption, which includes conventional encryption schemes and others such as the chaotic encryption [1]. Traditional image encryption technique regards the plaintext as original data stream, due to some intrinsic features of images, such as bulk size data and high correlation among pixels, traditional encryption algorithms such as DES, IDEA and RSA are not suitable for practical image encryption [2]. With the development of nonlinear dynamics and chaos theory, some common features, such as sensitivity to variables and parameters, between chaos and cryptography was revealed and exploited [3]. It has drawn increasing efforts to use chaotic systems for enhancing the security of communications.
Š 2017, IRJET
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The rest of the paper is organized as follows: Section 2 introduces the chaotic Baker map. Simulation and valuation of proposed modification in Section 3. Result and discussion in Section 5.
2. Chaotic Baker Map The chaotic Baker map is well-known to the image processing community as a tool of encryption. It is a permutation- based tool, which performs the randomization of a square matrix of dimensions N x N by changing the pixel positions based on a secret key [10]. It assigns a pixel to another pixel position in a bijective manner. The discretized Baker map is an efficient tool to randomize the items in a square matrix. . Let B(n1, . . . , nk),
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