Substitution steganography with security improved by chaotic image encryption

Abstract

This article describes an information hiding scheme, which combines advantages of steganography and cryptography. After brief review of currently used techniques and their properties, a chaotic image encryption method based on quadratic map is proposed. This algorithm is then utilized as a tool for encryption of image representing secret data, which is afterwards embedded into cover image by means of LSB matching. Paper also provides verification of results achieved by both parts of presented approach and discusses its advantages and drawbacks.