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Image Identification of Encrypted JPEG Images for Privacy-Preserving Photo Sharing Services
Kenta IIDA Hitoshi KIYA
IEICE TRANSACTIONS on Information and Systems
Publication Date: 2020/01/01
Online ISSN: 1745-1361
Type of Manuscript: Special Section PAPER (Special Section on Enriched Multimedia — Application of Multimedia Technology and Its Security —)
image identification, JPEG, Encryption-then-Compression system, privacy-preserving,
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We propose an image identification scheme for double-compressed encrypted JPEG images that aims to identify encrypted JPEG images that are generated from an original JPEG image. To store images without any visual sensitive information on photo sharing services, encrypted JPEG images are generated by using a block-scrambling-based encryption method that has been proposed for Encryption-then-Compression systems with JPEG compression. In addition, feature vectors robust against JPEG compression are extracted from encrypted JPEG images. The use of the image encryption and feature vectors allows us to identify encrypted images recompressed multiple times. Moreover, the proposed scheme is designed to identify images re-encrypted with different keys. The results of a simulation show that the identification performance of the scheme is high even when images are recompressed and re-encrypted.