Selective Secret Sharing Scheme for Privacy of Image and Video Compressed in MPEG-Like Formats - LIRMM - Laboratoire d’Informatique, de Robotique et de Microélectronique de Montpellier Access content directly
Conference Papers Year : 2023

Selective Secret Sharing Scheme for Privacy of Image and Video Compressed in MPEG-Like Formats

Cyril Bergeron
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William Puech

Abstract

This paper presents a reliable image and video secret storing method, aiming at ensuring the protected storage of multimedia files without risk for their owner to have their privacy violated. It relies on a particular property (standardized in MPEG-A Part.21 VIMAF) of video and image standards such as H.264/AVC, H.265/HEVC and MPEG-HEIF: a non negligible portion of the bitstream (so-called cipherable bits) can be altered without modifying the decodability of the stream. Such a modification results in an image or a video that is both a valid and visually encrypted media file. Not willing to be bothered by a complex key management system, we take inspiration from Shamir's secret sharing scheme, and propose a method where the secret to be shared is the original (unciphered) set of cipherable bits, that are encoded and divided in n shares, among which k−1 or less do not permit to reconstruct the secret, while k or more allow to recover it. Those n shares are then used to generate n ciphered fully standard compliant versions of the media. The rightful owner of the file will easily store these n versions in various Cloud storage locations, and recover them all when the fully deciphered file will be needed, while a hacker will most generally obtain only some of those files, hence not be capable to decrypt the file.
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Dates and versions

hal-04357312 , version 2 (10-01-2024)
hal-04357312 , version 1 (05-02-2024)

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Cyril Bergeron, Catherine Lamy-Bergot, Wassim Hamidouche, William Puech. Selective Secret Sharing Scheme for Privacy of Image and Video Compressed in MPEG-Like Formats. MMSP 2023 - IEEE 25th International Workshop on Multimedia Signal Processing, Sep 2023, Poitiers, France. ⟨10.1109/mmsp59012.2023.10337672⟩. ⟨hal-04357312v2⟩
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