Conclusions

Abstract

This book is on reversible Steganography and authentication via transform encoding. The prime focus of the book is to present a computability and reversibility of transform equation and to avoid imaginary components of the transform computations. Reversibility computations of transformation techniques are done here, namely DFT, DCT, wavelets, Z-transform, Binomial and Grouplet. The chaos-based authentication pseudorandom number sequence generations and image or message encryptions are also done. In general, the book focuses on the real part of the transform computations for embedding and extraction, but in cases of Z-transform, complex conjugate part is also used for embedding and authentication.