Design and implement of a hybrid cryptography textual system

The security techniques, today the most widespread, and based on coding algorithms. the encryption operations perform by using digital calculations. In this paper produce hybrid text encryption and image steganography algorithm, The text encryption based on chaos and the image steganography based on secret sharing, and chaos. In a novel symmetric algorithm: firstly, encrypt and decrypt a secret text message. Then, sharing the cipher secret text to multiple shadow based on secret sharing scheme. Finally, embedding the shadow with multi images cover. Several security analysis for text encryption are used such as secret key size, secret key sensitivity, histogram, autocorrelation, time, information entropy and differential analysis. PSNR used to measure the cover images quality. With numerical simulation results for text encryption, the proposed algorithm presents high level of security, increase key size and an excellent time for encryption. Image steganography with multi-cover presents increase the capacity reached 0.375 MB of secret text and maintains the qualities of cover images.