An Efficient Digital Image Encryption Using Pixel Shuffling and Substitution for Wireless Networks

Most of the proposed security algorithms for wireless networks consider only securing scalar data, which are not suitable for other data types, e.g., digital images. In addition, many methods add noticeable overhead in securing such data types hence affecting the provided security level and network performance. In this paper, we propose an efficient security scheme based on chaotic algorithm to efficiently encrypt the digital images over wireless network applications while taking into consideration the processing capability and time constrains of most wireless networks. Our proposed security algorithm processes the digital images in three phases: security key generation, pixel permutation, and substitution. The 2D Logistic chaotic map is used in permutation and substitution stages for image pixel shuffling and transposition in order to enhance the required level of security and resist against various security attacks. Security performance analysis based on standard test images shows that our proposed scheme satisfies the needed security requirements and has better performance compared with other proposed techniques.