A Novel 1D Hybrid Chaotic Map-Based Image Compression and Encryption Using Compressed Sensing and Fibonacci-Lucas Transform

Zhang, Tongfeng; Li, Shouliang; Ge, Rongjun; Yuan, Min; Ma, Yide

doi:https://doi.org/10.1155/2016/7683687

Mathematical Problems in Engineering

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Abstract Introduction Conclusion Acknowledgments References Copyright Related Articles

Research Article | Open Access

Volume 2016 | Article ID 7683687 | https://doi.org/10.1155/2016/7683687

A Novel 1D Hybrid Chaotic Map-Based Image Compression and Encryption Using Compressed Sensing and Fibonacci-Lucas Transform

Tongfeng Zhang,¹Shouliang Li,¹Rongjun Ge,¹Min Yuan,¹and Yide Ma¹

Academic Editor: Zhen-Lai Han

Received31 Dec 2015

Revised17 Apr 2016

Accepted18 Apr 2016

Published09 May 2016

Abstract

A one-dimensional (1D) hybrid chaotic system is constructed by three different 1D chaotic maps in parallel-then-cascade fashion. The proposed chaotic map has larger key space and exhibits better uniform distribution property in some parametric range compared with existing 1D chaotic map. Meanwhile, with the combination of compressive sensing (CS) and Fibonacci-Lucas transform (FLT), a novel image compression and encryption scheme is proposed with the advantages of the 1D hybrid chaotic map. The whole encryption procedure includes compression by compressed sensing (CS), scrambling with FLT, and diffusion after linear scaling. Bernoulli measurement matrix in CS is generated by the proposed 1D hybrid chaotic map due to its excellent uniform distribution. To enhance the security and complexity, transform kernel of FLT varies in each permutation round according to the generated chaotic sequences. Further, the key streams used in the diffusion process depend on the chaotic map as well as plain image, which could resist chosen plaintext attack (CPA). Experimental results and security analyses demonstrate the validity of our scheme in terms of high security and robustness against noise attack and cropping attack.

1. Introduction

With the fascinating development of computer networks and multimedia communications during the past decades, a great demand for secure image transmission is increased. Image encryption is one of effective measures to prevent unauthorized access to images [1, 2]. Since the introduction of chaos theory to cryptography and the proposal of permutation and diffusion structure by Matthews [3] and Fridrich [4], respectively, Chaos-based encryption algorithms have received remarkable attentions [5–9] for the reason that some typical features of chaos, including ergodicity, sensitivity to initial condition, and random-like behavior, can be well connected with some conventional cryptographic properties such as confusion and diffusion [10]. Chen et al. [5] have proposed an image encryption algorithm which employs the three-dimensional cat map to shuffle the positions of the image pixels and uses another chaotic map to confuse the relationship between the encrypted and its original image. Huang [6] has designed pseudorandom chaotic sequence with the created secret keys depending on each other and used a two-dimensional Chebyshev map in diffusion process. In [7], Pareek et al. have proposed a new approach for image encryption based on chaotic Logistic maps. An external secret key of 80-bit length and two chaotic Logistic maps are employed. Gao and Chen [8] presented a new image encryption scheme which employs an image total shuffling matrix to shuffle the positions of image pixels and then uses a hyperchaotic system to confuse the relationship between the plain image and the cipher image. A symmetric block cipher based on the improved standard map was derived by Lian et al. [9]. Permutation and diffusion structure are usually adopted in the cryptosystems mentioned above, which suggests iterating the permutation and diffusion stage several rounds to earn good confusion and diffusion effect, whereas the permutation in those cryptosystem is almost the same in each round and independent of plain image.

The chaotic system utilized in the cryptosystem often could be divided into one-dimensional (1D) chaos and high dimensional (HD) chaos [11]. 1D chaos such as Logistic map [12] and Tent map [13, 14] has fast computational performance while HD chaotic systems like Lorenz system [15], hyperchaos [16], and chaotic standard map [17] have large parametric space and high security. 1D chaotic maps often have simple structures and are easy to implement. But their intrinsic weakness such as small key space and weak security enables image encryption algorithm feasible to be attacked. To overcome those limitations, some improvements on 1D chaotic system have been carried out. Mazloom and Eftekhari-Moghadam [18] introduce a kind of coupled nonlinear chaotic map to color image encryption. Zhou et al. used a combination of two existing 1D chaotic maps to generate two new 1D chaotic maps in series and parallel in the literature [19] and [20], respectively, where the former has two parameters but weak uniform distribution property and the latter shows good uniform distribution property but has only one parameter essentially.

Recently, some researchers proposed a kind of compression-combined encryption method based on compressive sensing (CS) [21–27]. CS includes sparse representation, linear measurement, and reconstruction processes. An image compression-encryption scheme is proposed in [21], which combines 2D compressive sensing with nonlinear fractional Mellin transform. The literature [23] proposes a double-image encryption compression scheme. The major core of the encryption system is that two circular matrices and the measurement matrix utilized in compressive sensing are designed by using a two-dimensional Sine Logistic modulation map. Liu et al. [25] present a combined compressive sensing and optical image encryption method using double random phase encoding-based block compressive sensing. These CS-based image encryption methods could achieve satisfactory security performance except for the resistance of differentia attack due to the absence of diffusion process. Zhang et al. [27] apply the encryption and compression scheme into the field of medical images. The novelties of their work lie in that Bernoulli measurement matrix in CS is constructed by using Chebyshev map and quantized measurements by max-Llyod are encrypted in diffusion phase.

Presently, we aim to design a novel 1D hybrid chaotic map which possesses large key space and satisfies uniform distribution property. Meanwhile, CS-combined with Fibonacci-Lucas transform image encryption is put forward based on the proposed 1D chaotic map. Bernoulli measurement matrix in CS is derived by the 1D chaotic map. Permutation phase is fulfilled by Fibonacci-Lucas transform, whose transform kernel could be controlled by the hybrid 1D chaotic map. Furthermore, a linear scaling on the measurement data is taken into consideration to accomplish diffusion operation. The contributions of this work are as follows: firstly, a 1D hybrid chaotic map is constructed; secondly, the proposed chaotic map shows good uniform distribution and could constitute the Bernoulli measurement matrix in CS, thus reducing the cost of transmission and improving image recovery quality; thirdly, Fibonacci-Lucas transform is utilized to accomplish block scrambling, whose transform kernel is different from each other in each permutation round; finally, the diffusion operation related to plaintext is carried out after a linear scaling of the measurements. The proposed method is described in detail in Section 2. Section 3 presents the simulated results and security analyses. The conclusion is drawn in Section 4.

2. Proposed Method

2.1. One-Dimensional (1D) Hybrid Chaotic Map

The proposed 1D chaotic map is fulfilled by hybrid structures including both series and parallel, as shown in Figure 1. It is a nonlinear combination of three different 1D chaotic maps which are considered as seed maps [18, 19]. The system is defined by the following equation:where , , and are three 1D chaotic maps (seed maps) with parameters , , and ; mod is modulo operation; and is the iteration number. The three chaotic maps , , and can be chosen from among the Tent map, Logistic map, and Sine map, who are defined by (2a)–(2c), respectively,where , , and represent the Tent map, Logistic map, and Sine map, respectively, , , and are their control parameters, and the three chaotic output sequences s all fall within . It is obvious that there are three different combinations for choice of , , and in (1). As an example, , , and take the forms of Logistic map, Tent map, and Sine map, respectively. Correspondingly, (1) can be rewritten as

The chaotic behavior of the proposed 1D map is investigated by the ways of Lyapunov exponent (LE) and bifurcation diagram. Although our 1D map cannot exhibit good chaotic behavior in the full parametric range, there is still a large parametric space where the chaotic series with comparable uniform distribution property can be obtained. Here, the dynamics about the chaotic map in the scope of , , and is considered. The LE is numerically calculated and plotted in Figure 2. Figures 2(a)–2(c) show the 2D LEs versus parameter couples , , and , respectively. As shown in Figure 2, the LEs are all positive in the three subplots, indicating the chaotic behavior of the proposed map for , , and . Further, the bifurcation diagrams with different parameters could be utilized to examine the distribution property of the chaotic series. Figures 3(a)–3(c) are the 1D bifurcation diagrams with different parameters , , and . It can be obviously seen from Figure 3 that the chaotic sequences traverse the interval and uniformly distribute in the parametric range , , and . Hence, it could be sure that the proposed 1D chaotic map possesses excellent chaotic property in terms of uniform distribution and has relatively large parametric space, which can be suitable for the field of image encryption.

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2.2. Compressed Sensing Theory

The CS is a new framework for simultaneous sampling and compression of signals [28]. As for CS theory, a 1D sparse signal with length can be represented aswhere is the column vector of weighting coefficients and is an orthogonal basis matrix. and are equivalent representations of the signal, with in the time or space domain and in the domain. If only of the coefficients in (4) is nonzero, where , is termed as sparse signal [29]. In CS process, an measurement matrix incoherent with is used to obtain a nonadaptive linear map if signal is compressible. The measurement process is where is an vector; the sensor matrix is the product of and . To reconstruct the signal correctly, the sensor matrix should satisfy restricted isometry property (RIP) [29]. To satisfy the RIP condition, Gaussian random matrix, partial Hadamard matrix, random circular matrix, or Bernoulli matrix can be selected as the stable measurement matrix. In our scheme, Bernoulli matrix serves as measure matrix and could be equivalently constructed by the proposed 1D chaotic map (3) due to its good uniform distribution property as follows:where and represent the entry of the Bernoulli measure matrix and the iterative chaotic series of (3), , and

To recover from , the reconstruction can be proceeded by solving the following -norm minimization problem:

Some reconstruction algorithms, such as orthogonal matching pursuit (OMP) [30] and Bregman iterative algorithm [31], are effective in reconstructing the signal from the encrypted result. Here Bregman iterative algorithm is adopted to recover the images.

2.3. Fibonacci-Lucas Transform

In our image encryption, Fibonacci-Lucas transform (FLT) is used to operate image scrambling.

Definition 1 (see [32]). The Fibonacci-Lucas transform can be defined as the mapping such thatwhere and is the size of a digital image; and are Fibonacci series and Lucas series and can be described byrespectively.
It is clear that holds when . Hence, the transform kernel in formula (8) is turned into (11) as follows:And the corresponding inverse transform of FLT is asThe series form infinitely many transforms. Note that all of these transforms will be periodic in nature with a maximum possible periodicity of and will produce different scrambling patterns from each other [32]. Hence, we can select different transform matrix at each round permutation for consideration of high security level. It is also noted that Fibonacci-Lucas transform is only suitable to square matrices. As for rectangular matrices, we can take some measures to apply Fibonacci-Lucas transform to them. Suppose that the size of image is and is the greatest common divisor (g.c.d.) of and ; then the image is divided into blocks with size of and we can perform the transform on the square matrix to alter the position of each block.

2.4. Encryption Procedure

The flow chart of proposed image encryption method using compressive sensing and Fibonacci-Lucas transform is shown in Figure 4. In our approach, the original image with size of is firstly encrypted through CS; then the generated data is divided into blocks, where is the g.c.d. of and . The positions of blocks are modified by FLT. Lastly, the scrambled image is diffused with plaintext-related keys after a linear scaling. The detailed encryption steps are as follows.

Step 1. Perform discrete wavelet transform on the plain image to get the coefficients matrix .

Step 2. Iterate (3) with for times, where is constant. The first values are discarded due to the transient effect and we can obtain the sequence with length of . The measurement matrix is constructed according to where , and

Step 3. Compressively sample the coefficients according to .

Step 4. Calculate the greatest common divisor of and , then divide into blocks, and scramble them for rounds using (14) to obtain . That is to say, the block is permutated to the position every time bywhere . The value of in the th FLT transform, denoted by , is determined by = + 3.

Step 5. Carry on a linear scaling on . In general, the data of exceed the range of . As a simple and effective method, a linear map is considered here. Find the maximum and minimum value from represented by max and min and map them to 255 and 0, respectively. Let and and then is turned into asThen convert into 1D array .

Step 6. Perform diffusion process. In order to resist known plaintext attack and chosen plaintext attack, the diffusion method proposed in the literature [33] is adopted, whose details are described as follows:(I)Obtain the key stream from in Step 2 according to (II)Conventional diffusion process is carried out to calculate the cipher-pixel value by where and are the currently operated pixel and output pixel, respectively, is the previous cipher-pixel, and is the initial value and may serve as secrete key.(III)Calculate according to Then, let and return to step (I) until all output pixels are obtained.

Step 7. Execute Step 6 once again to achieve satisfactory performance and reshape the sequence to get the final ciphered image .
Decryption is the inverse process of encryption, whose steps mainly include the following.

Step 8. Perform inverse diffusion according to

Step 9. An opposite linear scaling is carried out by

Step 10. Inverse Fibonacci-Lucas transform is performed by

Step 11. The original plain image is recovered by Bregman iterative algorithm.

3. Simulated Results and Analyses

In this section, some simulations and performance evaluation including key space, key sensitivity, statistics analysis, differential attack, and robustness to noise attack are discussed. And all the tests in this paper are conducted under MATLAB 7.11.0 (R2010b) on a laptop with the Windows 7 operating system of 64-bit, Intel(R) Core(TM) i7-4790 CPU @ 3.20 GHz, and 4 GB RAM.

3.1. Experimental Results

The gray images Lena and Cameraman with the size of and Baboon and Boat with the size of serve as test images. The DWT matrix is adopted as the basis matrix . Bregman iterative algorithm is utilized to implement reconstruction. The parameters in the proposed 1D chaotic map are taken as , , and . The rounds num of FLT and the initial are set to be 3 and 123, respectively. The compression ratio is set to be 0.75. The experimental results of the four test images Lena, Cameraman, Baboon, and Boat are shown in Figure 5, where the first column, second column, and third column represent plain images, ciphered images, and decrypted images, respectively. It can be seen from Figure 5 that the ciphered images are well decrypted visually, indicating the validity of our scheme. In order to quantify the recovery quality, the peak signal to noise ratio (PSNR) value of the reconstructed image with the corresponding original image is considered here. The PSNR for an image can be calculated aswhere MSE denotes mean square error and is expressed bywhere and represent the corresponding pixel values of the original and reconstructed images, respectively.

The PSNR versus the compression rate for the test images Lena with size of is plotted in Figure 6, where the size of measurement matrix varies from 32 to 224 with step of 32. It is clear from Figure 6 that our scheme could achieve satisfactory recovery performance. Further, the methods with original Bernoulli measurement matrix and the one generated by Chebyshev chaotic map in [27] are also listed for the purpose of comparison with the one generated by the proposed chaotic map. Obviously, the recovery performance by our chaotic map almost approaches the one by Bernoulli random matrix and exceeds the one by Chebyshev chaotic map, whereas our method could achieve higher transmission efficiency in contrast to the original Bernoulli and has larger key space compared to Chebyshev chaotic map.

3.2. Key Space and Key Sensitivity

The key space of a good encryption scheme should be large enough to resist the brute-force attack. As described above, the keys in our cryptosystem are comprised of the parameters , , , initial in the proposed 1D chaotic map, and in the diffusion. The three control parameters , , and take values in range of , [, and and the practical key space approaches if the precision reaches, which is enough to prevent the exhaustive searching. Thus, brute-force attack on the keys is computationally infeasible.

An efficient encryption algorithm should also be sensitive to secret keys. It means a very small change in the key will cause a greatly significant change in the output, which is the guarantee of security. In the experiments, we make a slight change in the values of the keys , and and then try to encrypt and reconstruct the images. First, the key sensitivity to encryption is analyzed. The different keys with deviation to original ones are used to encrypt the original Lena image. The corresponding results are presented in Figure 7, where (a) is original Lena image, (b) is encrypted image, (c), (e), and (g) denote the encrypted images with incorrect keys , , and , respectively, (d), (f), and (h) denote the differential images between (c) and (b), (e) and (b), and (g) and (b), respectively. From (d), (f), and (h), we can see a great amount of changes happening due to the slight variation of encryption keys, which demonstrates that the keys are highly sensitive to encryption. Further, a group of key sensitivity tests for decryption are executed on Lena and Cameraman. The wrong keys with deviation to original ones in encryption are taken to decrypt the cipher images, as shown in Figure 8. The deviations to the values of , , and are and in (a1)–(a4) and (b1)–(b4), respectively. It is obvious from Figure 8 that the decrypted images cannot provide any useful information visually. As is illustrated, the proposed cryptosystem is also highly sensitive to the keys.

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3.3. Statistical Analysis

In this subsection, statistical analysis is carried out in terms of histogram and correlation between two adjacent pixels of images.

Histogram is an important statistical feature of the images, which is often used to evaluate the performance of image encryption schemes. An encryption scheme should have the ability to transform an original image into a random-like encrypted image with relatively low correlations among neighborhood pixels. The histograms of original images and corresponding ciphered images are shown in Figure 9. From top to bottom are histograms of Lena, Cameraman, Baboon, and Boat. The left column represents the results of original image and the right column represents the corresponding results of ciphered ones. From Figure 9, one can almost see the frequency of each gray level from the histograms of original images, which can expose image information, whereas the histograms of the corresponding encrypted ones are fairly uniform in distribution. Thus, it can be said that the proposed algorithm could homogenize the original image and resist statistical attack.

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The correlation coefficient of the adjacent pixels is also an important statistical feature of images. In general, there is a strong correlation between adjacent pixels in a meaningful image. The correlation coefficient between two adjacent pixels can be described aswhere , , and is the number of total pixels.

We randomly select 2000 pairs of adjacent pixels from original image and encrypted image in horizontal, vertical, and diagonal direction, respectively. The correlation coefficients of two adjacent pixels in the original image and encrypted image in Figure 5 are listed in Table 1. Table 1 shows that the correlation among pixels in ciphered images in each direction reduces to a lower level comparing with the original image.

Further, the correlation distribution can also reveal the correlation between two adjacent pixels intuitively. Regular distribution means strong correlation while dispersed distribution means weak correlation. As an example, the correlation distributions of two adjacent pixels in different directions for original Boat and ciphered one are plotted in Figure 10. It can be seen that the correlation distribution of the cipher image performs much more dispersed property in each direction than the one of plain image. Hence, the proposed scheme could remove the tight relationship between adjacent pixels of the original image successfully. The results demonstrate that the proposed scheme can resist statistical analysis since the attackers cannot obtain useful information.

3.4. Information Entropy

Shannon [34] introduces the entropy in information theory as information entropy (IFE) to describe the information redundancy associated with feature of randomness. In an image encryption system, IFE can reflect the information redundancy of an image, defined aswhere is the gray/color level within levels with bits.

It is well-known that the larger the IFE is, the more randomness the image performs. For 256-level gray image the maximum value of IFE can reach 8. The IFEs of the original images and the encrypted images in Figure 5 are numerically calculated and listed in Table 2. It can be found that the IFEs of the four images after encryption are all close to 8. Hence, the probability for the proposed cryptosystem to divulge information is very little.

3.5. Resistance to Differential Attack

Attackers often make a tiny change in the original image and then use the proposed algorithm to encrypt the original image before and after modification, to find out the relation between the original image and the ciphered image, that is, the differential attack. In order to examine the performance of resisting differential attack, the number of pixels’ change rate (NPCR) and the unified average changing intensity (UACI) are calculated. If a tiny modification in original image can cause a significant change in encrypted image, the differential attack would be considered invalid. Let and denote the pixels located at in encrypted images and with the size of . Then the NPCR and UACI are defined as We randomly select a pixel from the original image and modify it through bitwise exclusive with 1, that is, , and thus get another modified image. Note that there is only one bit difference between the original and modified one. After the four images are encrypted by our encryption scheme, the NPCR and UACI could be calculated. The corresponding results for the four original images in Figure 5 are shown in Table 3. We have found that UACI and NPCR are over 33.4% and 99.6% after two round diffusions. Hence, our encryption scheme has excellent performance in terms of resistance to differential attack.

3.6. Robustness

3.6.1. Noise Attack

It is unavoidable that the encrypted image could be contaminated by the noise during transmission and processing. So the robustness of the proposed encryption scheme against noise attack is considered here. Suppose that the noise impacts the cipher image in the following way: where and are the noisy encrypted image and the uncontaminated encrypted image, respectively. is the noise intensity and is the white Gaussian noise with zero-mean and the standard deviation of 1. The decrypted results for Lena contaminated by different noise intensity are shown in Figures 11(a)–11(c). The decrypted images reserve the overall information of the original images and can be recognized visually, which demonstrates that our scheme has the ability of resisting noise attack to some extent.

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3.6.2. Cropping Attack

The robustness of a cryptosystem against cropping attack is also required in image transmission. In general, the occlusion of the cipher can affect the decrypted images greatly. The encrypted Lena images with three different occlusions of 0.39%, 0.88%, and 1.20% are shown in Figures 12(a1), 12(a2), and 12(a3), respectively, and the corresponding decrypted images are displayed in Figures 12(b1), 12(b2), and 12(b3), respectively. The two original images can be recognized from the decrypted images (b1) and (b2). But it is blurry in (b3). Thus the proposed encryption scheme could resist cropping attack to a certain degree.

3.7. Encryption Speed

Except for security analyses, the encryption speed is also important in image encryption. Actually, the encryption time depends on the factors such as programming environment and computer configurations. Thus the running speeds cannot be compared directly. In our scheme, three measures are taken to improve the running speed. The first one is to employ Bregman iterative reconstruction algorithm to reduce the time cost. The second one is to perform a simple linear scaling on the measurement data instead of max-Lloyd quantization. The last one is that block FLT is utilized to implement the scrambling. All the measures can help to improve the running speed effectively. In this paper, the proposed method is simulated via MATLAB 7.11.0 (R2010b) on a laptop with the Windows 7 operating system of 64-bit, Intel(R) Core(TM) i7-4790 CPU @ 3.20 GHz, and 4 GB RAM. The encrypted time is approximately 6.23 seconds and 40.45 seconds for the and gray images, respectively.

4. Conclusion

A kind of combined CS and FLT image encryption scheme is proposed based on a novel 1D hybrid chaotic map. The constructed chaotic map exhibits better uniform distribution and has larger key space than existing 1D chaotic map. In our method, Bernoulli measurement matrix generated by the proposed chaotic map exhibits comparatively high recovery quality. Meanwhile, FLT with variable transform kernel in each permutation round is utilized to scramble the sampling image. Further, a simple but effective linear scaling on measure data is taken into consideration before diffusion. Due to the large key space, complexity of permutation, and plaintext-related diffusion, the proposed encryption scheme can resist brute attack, statistical attack, and differential attack. Simulation results show the validity of our scheme in terms of high security and robustness against noise attack and cropping attack.

Competing Interests

The authors declare that there are no competing interests regarding the publication of this paper.

Acknowledgments

This work was partially supported by National Natural Science Foundation of China (nos. 61175012 and 61201422), Natural Science Foundation of Gansu Province (no. 1208RJ-ZA265), and Specialized Research Fund for the Doctoral Program of Higher Education of China (no. 2011021111-0026).

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Copyright © 2016 Tongfeng Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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