This conclusion presents some closing thoughts on the concepts covered in the preceding chapters of this book. The book is devoted to the study of encrypted image and video transmission over wireless systems, like satellite and mobile systems. It presents a study of diffusion and permutation-based image encryption. The book also presents an enhanced chaotic encryption scheme based on different modes of operation to enhance the security of chaotic encryption. This enhancement in security has been revealed with uniform histograms. The book also presents another enhancement in diffusion-based algorithms. The different versions of OFDM have been studied for the transmission of encrypted images and videos with all encryption schemes. The book presents the effects of channel equalization, CFO compensation, and PAPR reduction methods.