Data Embedding Methods Not Based on Content Modification

Abstract

Creation of a stego object by embedding information in a cover object often distorts the cover object. As more information is embedded, more annoying noise is introduced in stego objects. Although reversible embedding methods enable us to restore the original cover object even after embedding, stego objects are not free from distortions. Embedding information does not, however, always result in damaging the contents of the cover object. This chapter introduces data embedding methods that are not based on modification of the contents of cover objects: permutation steganography, metadata steganography, and cover generation methods. This chapter focuses on elaborating the basic principles of these techniques.