19-10-2016, 03:34 PM
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Abstract. With the development of information security, the traditional image encryption algorithm
has been far from to ensuring the security of images in the transmission process. This paper presents a
new image encryption algorithm, which can improve the security of image during transmission more
effectively. The traditional scrambling algorithm based on Arnold transformation only applies to the
square area, which is a big limitation. Focus on this, a multi-region algorithm for image scrambling
encryption model is proposed, which splits the non-square image to multiple square regions, and
scrambles each region. Experimental results show that the new algorithm improves the image security
effectively to avoid deciphering, and it also can restore the image as same as the original image almost,
which reaches to the purposes of image safe and reliable transmission.
Introduction
Keywords: Arnold transform. image encryption· image scrambling· multi-regional·scrambling
degree.
Digital image scrambling can make an image into a completely different meaningless image during
transformation, and it is a preprocessing during hiding information of the digital image, which also
known as information disguise. Image scrambling technology depends on data hiding technology
which provides non-password security algorithm for information hiding. Data hiding technology led to
a revolution in the warfare of network information, because it brought a series of new combat
algorithms, and a lot of countries pay a lot of attentions on this area. Network information warfare is an
important part of information warfare, and its core idea is to use public network for confidential data
transmission. The image after scrambling encryption algorithms is chaotic, so attacker cannot decipher
it.
Some improved digital watermarking technology can apply scrambling method to change the
distribution of the error bit in the image to improve the robustness of digital watermarking technology.
Arnold scrambling algorithm has the feature of simplicity and periodicity, so it is used widely in the
digital watermarking technology[1] (Arnold transform is proposed by V. I. Arnold in the research of
ergodic theory, it is also called catmapping, and then it is applied to digital image). According to the
periodicity of Arnold scrambling, the original image can be restored after several cycles. Because the
periodicity of Arnold scrambling depends on the image size, it has to wait for a long time to restore an
image. Generally, the cycle of Arnold transformation is not directly proportional to the image degree[2].
Currently, Arnold scrambling algorithm is base on square digital image in most literature, and these
images are mostly N×N pixels of the digital image. However, most of the digital images are non-square
in the real world, so that we cannot use Arnold scrambling algorithm widely[3]. To improve the Arnold
scrambling algorithm, we will improve the original Arnold scrambling algorithm, so that we can apply
Arnold scrambling algorithm to M×N non-square pixel digital image, it means the length and width of
the image is not equal
Conclusions
This paper gives a new image scrambling algorithm, by using image scrambling to encrypt the
image to improve the security of image. Compared with the traditional Arnold scrambling algorithm,
the proposed multi-area scrambling method in this paper not only can be used for a square image, but
for any non-square images. By using multi-region scrambling, it can more effectively improve the
security of image, lead decipher even more difficult. It simulates scrambling under Matlab 7.1 to
confirm it. Experimental result shows that the improved algorithm is feasible.