Image Hybrid Encryption Based on Matrix Nonlinear Operation and Generalized Arnold Transformation

In this paper, we propose a scheme to implement hybrid encryption of images using generalized Arnold transformation and matrix nonlinear operations. This scheme consists of two stages. In the first stage, the pixels scrambling encryption is achieved by using generalized Arnold transformation. In the second stage, the pixels sequence encryption is carried out by a nonlinear matrix operation based on the key stream generated by a random matrix. Accordingly, the decryption process is completed by two steps inverse transformations. The hybrid encryption algorithm is one-time pad, and therefore has good anti-attack performance. The algorithm is featured by good confidentiality, low computational complexity, and easy-to-program processing. Moreover, the effectiveness, security and robustness of the algorithm are demonstrated by an image encryption simulation and the encryption performance analysis. Compared with the traditional Arnold scrambling encryption scheme and the chaotic encryption method based on the generalized standard mapping, the superiority of the proposed algorithm is demonstrated.

The Improved Image Scrambling Algorithm for the Wireless Image Transmission Systems of UAVs

With the deepening of modern military reforms, information has become the key to winning modern warfare. The use of unmanned aerial vehicle (UAV) to capture image information has become an important means of reconnaissance in modern warfare and plays an irreplaceable role. The image information usually uses a wireless image transmission system, since image information is intercepted or stolen easily during the information transmission, encrypting an image is a common method for ensuring image security. However, traditional encryption algorithms have some deficiencies in terms of efficiency and security. In order to overcome these shortcomings, a new algorithm is proposed in this paper-an improved image scrambling encryption algorithm based on Fibonacci-p coding. The first new idea of the algorithm is to separate the positive and negative signs and data of the scrambled DCT coefficients, then form the symbol matrix and the data matrix respectively, perform the scrambling encryption operation on the symbol matrix. The second new idea is to encrypt the color RGB image by converting the R, G, and B colors into Y, Cb, and Cr, and converting the normal image operation into operations on Y, Cb, and Cr, thereby implementing the encryption operation. The comprehensive performance of the algorithm is optimal with different image information. Experiments results validate the favorable performance of the proposed improved encryption algorithm.

Research on O-OFDM System Based on Hyper Chaos Scrambling Encryption Algorithm

A new scrambling method in the O-OFDM [ [ signal is proposed based on the hyper-chaotic sequences. By scrambling the frequency signal, it can reach the role of encryption. First, a hyper-chaotic sequence is produced by a hyper-chaotic system; then scrambling the O-OFDM signal on the frequency and time domain by using the pseudo-randomness of the hyper-chaotic sequence. In this paper a 256×256lena image is as the original information to prove the effect of this new method. The experiment that conducted in the simulation O-OFDM system of the Optisystem software indicates: the algorithm has high security; and because of the character of the hyper-chaotic system, the secret key space has largely improved. It can ensure the safety of the information transmission effectively.