Open Access

ARTICLE

Compression of Grayscale Images in DRPE-based Encrypted Domain

by Osama S. Faragallah^1,*, Ensherah A. Naeem², Hala S. Elsayed³, Fathi E. Abd El-Samie⁴

1 Department of Information Technology, College of Computers and Information Technology, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
2 Department of Electrical, Faculty of Technology and Education, Suez University, Suez 43527, Egypt
3 Department of Electrical Engineering, Faculty of Engineering, Menoufia University, Shebin El-Kom 32511, Egypt
4 Department of Electronics and Electrical Communications Engineering, Faculty of Electronic Engineering, Menoufia University, Menouf 32952, Egypt

* Corresponding Author: Osama S. Faragallah. Email:

Intelligent Automation & Soft Computing 2021, 30(3), 1019-1031. https://doi.org/10.32604/iasc.2021.019185

Received 04 April 2021; Accepted 05 May 2021; Issue published 20 August 2021

Abstract

Compressing the encrypted images is considered an important issue in many applications such as cloud computing. From this perspective, this paper introduces an efficient approach for compression processing of images in the encrypted domain. The images are optically encrypted using the Double Random Phase Encoding (DRPE). The Joint Photographic Experts Group (JPEG) and the Set Partitioning in Hierarchical Trees (SPIHT) compression schemes have been used to compress the encrypted images. The process starts by converting the original image into an optical signal by an optical emitter like an optical source and encrypting it with DRPE. The DRPE applies two-phase modulations on both time and frequency domains to get the encrypted image. The JPEG and SPIHT compression techniques are utilized with different bit rates. The effect of compressing encrypted images with the DRPE is studied. Security analysis results show that the encrypted images using the DRPE are adequately compressed by SPIHT at a low bit rate, and can be adequately compressed by JPEG at a high bit rate. Also, experimental outcomes and security study prove that the multipurpose encryption and SPIHT compression scheme is more secure and effective.

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Keywords

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