An Approach for Embedding the Colored Secret Image based on Multi-Cover Sharing Scheme

Mahmood Zaki Abdullah; Zinah Jamal Khaleefah

Mahmood Zaki Abdullah Computer Engineering Department Al-Mustansiriyah University Baghdad-Iraq
Zinah Jamal Khaleefah Computer Engineering Department Al-Mustansiriyah University Baghdad-Iraq

Keywords: Steganography, cryptography, Lorenz chaotic map, secret sharing scheme

Abstract

Cryptography and steganography are the two major techniques used for securing the information during communication. This paper proposed an algorithm for cryptography and steganography based on image sharing and chaotic system (ISCS), Where the ISCS algorithm has been applied to perform three operation. firstly, encrypt the secret color image based on Lorenz chaotic map. Then, sharing the cipher image to n shadow based on secret sharing scheme. Finally, embedding n shadow with n cover images. Several security analysis for image encryption are used, such as secret key space and sensitivity, histogram, autocorrelations, entropy, and differential analysis. The peak signal to noise ratio PSNR is used for testing and measuring the quality and performance for cover images of the proposed algorithm. With numerical simulation results, The proposed ISCS algorithm have high level for security, large key space for image encryption and high payload capacity reached to 0.75 M of pixels that embedding in four cover images size (512*512) with quality reached to 44 db of PSNR.