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Recently, a block encryption scheme based on dynamic sequences generated by multiple chaotic systems has been proposed. This paper points out some defects of the scheme and its related security problems. Furthermore, the paper gives out the details of a chosen plaintext attack and verifies it through experiments. The result of experiment shows that the encryption scheme cannot resist the chosen plaintext...
The focus of this paper is the security of industrial design images. An encryption algorithm, based on the Logistic and the Henon maps, is proposed. The algorithm aims to ensure the security of industrial design images, and uses chaotic iteration to generate the encryption keys, and then carries out the XOR and cyclic shift operations on the plain text to change the values of image pixels. The algorithm...
An efficient image encryption algorithm is proposed, based on image reconstruction using some adjacent pixel characteristics. Since the permutation of sub-images composing of high 4-bits of the original image has a relatively high computational complexity, in the new scheme the permutation of sub-images is performed with low 4-bits instead, which therefore has a lower computational complexity. Experiment...
How to design a fast and efficient method for message digest is always a hotspot in modern cryptographic researches. A message digest method based on chaotic map for medical images is proposed in this paper. At the beginning of this approach, an original message is grouped to generate an initial vector. And then the entire binary bits of the message are utilized for the chaotic map function which...
In this paper, an image encryption algorithm based on improved 3D cat map is proposed. The new algorithm employs Henon map chaotic sequence to generate control parameters of shuffling and uses improved 2D Logistic map sequence to substitute grey values. It cannot only effectively encrypt images, but also can resist cipher analyzers' attack by periodicity of cat map. Experimental results and security...
An improved image encryption algorithm based on chaos is proposed for the degradation of periodicity, in which permutation is firstly carried out. Then the permuted image is encrypted by Chen's chaotic system pixel by pixel and it makes the encryption more secure because the dynamical property of the Chen's chaotic system is more complicated than the Lorenz chaotic system. The experiment results demonstrate...
Chaos-based image encryption algorithms are widely investigated recently. Concrete implementation of theses conventional chaos-based algorithms usually arise some security problems due to the computation precision restriction. This paper proposes an improved chaos-based image encryption scheme, in which the grayscale substitution is done by circular bit shift method. The scheme enlarges key space...
Performing tag-reader mutual authentication to detect cloned fake tags and ward off malicious readers is a basic requirement of various applications of RFID technology. In this paper, we propose an efficient RFID tag-reader mutual authentication scheme that is light weight, simple to implement and can effectively alleviates tracking and replaying threats. This scheme also has good performance and...
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