Image Identification of Encrypted JPEG Images for Privacy-Preserving Photo Sharing Services

Iida, Koji; Kiya, Hitoshi

doi:10.1587/transinf.2019mup0006

Cited by 2 publications

(1 citation statement)

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“…The authors in [53] determined some parameters that can be used in order to resist such manipulations. Similarly, photo-sharing schemes based on an extended algorithm of the Color CPE and of the PGS-CPE were proposed in [54,55] and [56], respectively. The main advantage of the schemes was the identification of images re-encrypted with different keys.…”

Section: Cpe Scheme Applicationsmentioning

confidence: 99%

Comprehensive Analysis of Compressible Perceptual Encryption Methods—Compression and Encryption Perspectives

Ahmad

Choi

Shin

2023

Sensors

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Perceptual encryption (PE) hides the identifiable information of an image in such a way that its intrinsic characteristics remain intact. This recognizable perceptual quality can be used to enable computation in the encryption domain. A class of PE algorithms based on block-level processing has recently gained popularity for their ability to generate JPEG-compressible cipher images. A tradeoff in these methods, however, is between the security efficiency and compression savings due to the chosen block size. Several methods (such as the processing of each color component independently, image representation, and sub-block-level processing) have been proposed to effectively manage this tradeoff. The current study adapts these assorted practices into a uniform framework to provide a fair comparison of their results. Specifically, their compression quality is investigated under various design parameters, such as the choice of colorspace, image representation, chroma subsampling, quantization tables, and block size. Our analyses have shown that at best the PE methods introduce a decrease of 6% and 3% in the JPEG compression performance with and without chroma subsampling, respectively. Additionally, their encryption quality is quantified in terms of several statistical analyses. The simulation results show that block-based PE methods exhibit several favorable properties for the encryption-then-compression schemes. Nonetheless, to avoid any pitfalls, their principal design should be carefully considered in the context of the applications for which we outlined possible future research directions.

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