Encrypted Image Transmission Research Articles

Combination of Hybrid Chaotic Encryption and LDPC for Secure Transmission of Images over Wireless Networks

Robust and secure transmission strategy for high quality image through wireless networks is considered a great challenge. However, the majority of encrypted image transmission schemes don't consider well the effect of bit errors occurring during transmission. These errors are due to the factors that affect the information such as noise and multipath propagation. That should be handled by an efficient channel coding scheme. Our proposed scheme is based on combining hybrid chaotic encryption, which is based on two- dimensional chaotic maps which is utilized for data security, with an error correction technique based on the Low Density Parity Check (LDPC) code. The LDPC is employed as channel coding for data communication in order to solve the problem of the channel's limited bandwidth and improve throughput. Simulation results show that the proposed scheme achieves a high degree of robustness against channel impairments and wide varieties of attacks as wells as improved reliability of the wireless channel. In addition, LDPC is utilized for error correction in order to solve the limitations of wireless channels.

Optimized OFDM Transmission of Encrypted Image Over Fading Channel

This paper compares the quality of diffusion-based and permutation-based encrypted image transmission using orthogonal frequency division multiplexing (OFDM) over wireless fading channel. Sensitivity to carrier frequency offsets (CFOs) is one of the limitations in OFDM transmission that was compensated here. Different OFDM diffusions are investigated to study encrypted image transmission optimization. Peak signal-to-noise ratio between the original image and the decrypted image is used to evaluate the received image quality. Chaotic encrypted image modulated with CFOs compensated FFT-OFDM was found to give outstanding performance against other encryption and modulation techniques.

Image Security With Different Techniques Of Cryptography And Coding: A Survey

Due to the growth of multimedia applications, the protection of this multimedia data becomes a very important issue of communication and storage; especially when it is transferred over an insecure channel, where apart from preventing illegal data access, images are used in many fields such as medical science and military. The protection of images can be done with image encryption. The majority of encrypted image transmission schemes does not adequately take into account the effect of bit errors occurring during transmission and this issue is considered a problem that should be handled by an efficient coding scheme. Hence, error correction code should be applied after encryption to protect encrypted images against channel errors. In this paper, we present a survey of image encryption techniques and channel coding techniques.

Image Encryption Based on Improved Chaotic Sequences

Image encryption is an active and challenging research area. This article proposes a transposing and scrambling image encryption algorithm based on improved hyper-chaotic sequence to provide enhanced security for encrypted image transmission. The algorithm processes the hyper-chaotic sequence according to the pixel information, which makes the keys be sensitive to original image. Then we apply scrambling and transposing operation to the pixels in image, according to separate scrambling keys and grayscale transposing keys. The result of simulation shows that, the encryption algorithm proposed by this article is effective in image encryption and decryption, which could enhance the security of image encryption and reduce the risk of attack

An Image Encryption Algorithm Based on Oversampled Chaotic Map

A new image encryption algorithm based on chaotic sequence is proposed, and the over sampled techniques is used in the Chebyshev mapping and Logistic chaotic mapping to generate multi-parameter chaotic key.A chaotic image encryption transmission system is build to achieve the encryption and decryption of the image signal,and the security and the encryption properties of the algorithm are analyzed. Simulation results show that the method ia simple and easy to achieve, and with larger key space ang good encryption effect.

Image Encryption of Underwater Bodies Using Wavelets 2013

The explosive growth of multimedia information and its transmission over the widely opened communication channels requires heightened awareness of security. Transmitting and storing of images which forms the highest percentage of multimedia data in a highly secured manner is quite challenging. Hence image encryption is a key weapon to maintain confidentiality from unauthorized person. In this paper, the proposed algorithms used for image encryption using wavelets for underwater bodies is more effective and efficient as compared to previous techniques. To achieve secure, reliable and encrypted image transmission from unmanned vehicle by using new image encryption technique using wavelet transformation. Encryption is required for transmission of images captured from undersea using existing small bandwidth channels as it is capable to compressing and decompressing the image and secure transmission is possible between ships and ground station.An implementation could be taken up using various possible channels with low bandwidth and highly noisy conditions.

Energy-Constrained Quality Optimization for Secure Image Transmission in Wireless Sensor Networks

Resource allocation for multimedia selective encryption and energy efficient transmission has not been fully investigated in literature for wireless sensor networks (WSNs). In this article, we propose a new cross-layer approach to optimize selectively encrypted image transmission quality in WSNs with strict energy constraint. A new selective image encryption approach favorable for unequal error protection (UEP) is proposed, which reduces encryption overhead considerably by controlling the structure of image bitstreams. Also, a novel cross-layer UEP scheme based on cipher-plain-text diversity is studied. In this UEP scheme, resources are unequally and optimally allocated in the encrypted bitstream structure, including data position information and magnitude value information. Simulation studies demonstrate that the proposed approach can simultaneously achieve improved image quality and assured energy efficiency with secure transmissions over WSNs.