Self Contained Encrypted Image Folding

TL;DR

This paper presents a self-contained encrypted image folding method that embeds all necessary information within the cipher image, enabling image recovery without external data, and extends to color images with improved efficiency.

Contribution

It generalizes encrypted image folding to be self-contained by embedding all recovery info, reducing cipher image size, and supporting color images.

Findings

Cipher image size can be smaller than original image.

The method effectively handles color images.

Numerical examples validate the approach.

Abstract

The recently introduced approach for Encrypted Image Folding is generalized to make it Self Contained. The goal is achieved by enlarging the folded image so as to embed all the necessary information for the image recovery. The need for extra size is somewhat compensated by considering a transformation with higher folding capacity. Numerical examples show that the size of the resulting cipher image may be significantly smaller than the plain text one. The implementation of the approach is further extended to deal also with color images.