Encryption Before Compression Coding Scheme for JPEG Image Compression Standard
Dariusz Puchała, Kamil Stokfiszewski, Mykhaylo Yatsymirskyy · 2020
In this paper we present a new joint encryption and compression coding scheme of natural images which is intended for the use in conjunction with a popular JPEG image compression standard. The encryption is performed prior to compression step and is carried out using fast, parametrized with a private key, linear transformations which do not alter statistical characteristics of the input image data, what enables JPEG algorithm to maintain its full compression capabilities. The work also includes a mathematical model of the proposed scheme which allows for theoretical analysis of the impact of the image encryption step on the compression process. The presented experimental results indicate that the reconstructed images' qualities at a given compression ratios are comparable to those obtained for the JPEG standard without the encryption step.