README: Robust Error-Aware Digital Signature Framework via Deep Watermarking Model

TL;DR

README introduces a novel deep watermarking framework that enables error-tolerant, verifiable digital signatures in images, significantly improving capacity and robustness for cryptographic applications without fine-tuning existing models.

Contribution

The paper presents README, a framework combining capacity scaling and error correction modules to enable high-capacity, error-tolerant digital signatures in images using deep watermarking.

Findings

Zero-bit-error image rate increased from 1.2% to 86.3%.

Supports embedding 2048-bit signatures with high robustness.

No fine-tuning required for existing watermarking models.

Abstract

Deep learning-based watermarking has emerged as a promising solution for robust image authentication and protection. However, existing models are limited by low embedding capacity and vulnerability to bit-level errors, making them unsuitable for cryptographic applications such as digital signatures, which require over 2048 bits of error-free data. In this paper, we propose README (Robust Error-Aware Digital Signature via Deep WaterMarking ModEl), a novel framework that enables robust, verifiable, and error-tolerant digital signatures within images. Our method combines a simple yet effective cropping-based capacity scaling mechanism with ERPA (ERror PAinting Module), a lightweight error correction module designed to localize and correct bit errors using Distinct Circular Subsum Sequences (DCSS). Without requiring any fine-tuning of existing pretrained watermarking models, README significantly boosts the zero-bit-error image rate (Z.B.I.R) from 1.2% to 86.3% when embedding 2048-bit digital signatures into a single image, even under real-world distortions. Moreover, our use of perceptual hash-based signature verification ensures public verifiability and robustness against tampering. The proposed framework unlocks a new class of high-assurance applications for deep watermarking, bridging the gap between signal-level watermarking and cryptographic security.