Authentication and recovery of an image by sharing and lattice-embedding

Abstract

Based on sharing and lattice-embedding techniques, we present an authentication-recovery method for an image. The recovery data are shared among many shadows, then lattice-embedding is utilized to embed each shadow in the discrete cosine transform domain of an 8×8 block. The proposed method can resist certain content-preserving operations such as JPEG compression, Gaussian noise, and brightness adjustment, up to a tolerance level controlled by a quantization parameter value. The method can also resist certain security attacks such as a cut-and-paste attack, a collage attack, and a vector quantization attack. Compared with previous works, the proposed method has following major advantages and novelty: (1) the method does not require prediction of the tampering trace, and the tampered blocks are always recovered as long as the number of valid blocks reaches a threshold and (2) lattice-embedding yields smaller distortion than does parity-check quantization, and the latter was often used in reported works.

Image Fragile Watermarking through Quaternion Linear Transform in Secret Space

“…Besides detecting whether it has been tampered by common signal processing operations, the Lin et al [22] scheme adds the recovery functionality of the affected image regions. To achieve these goals, they make use of several tools chosen to meet the requirements of watermarking schemes: lattice-based embedding into the DCT coefficients to lower the impact of the hidden data and a secret sharing approach to reconstruct the watermark with recovery capability.…”

A novel image restoration scheme based on structured side information and its application to image watermarking

“…How to balance the requirements for both higher capacity and more robustness is an open research question. Lin and Lin [12] introduced a semifragile watermarking scheme with self-restoration ability based on (t, n) secret sharing and Reed-Solomon (RS) code. The restoration watermark is generated from the four lowest DCT coefficients and encoded as an RS code.…”

Secure self-recovery watermarking scheme for error concealment and tampering detection

“…Tong et al [27] also use a watermarking algorithm to detect and localize tampered areas. Lin et al [28] present an authentication and recovery method for tampered images.…”