HASH Algorithm Principles Using SHA-1 for Digital Signature Watermarking

This approach utilizes the HASH algorithm (specifically SHA-1) principles to design a digital signature-based watermarking algorithm that completes embedding, extraction, and verification processes. The algorithm embeds digital signatures into various digital media formats such as images, audio, and video files to ensure their integrity and authenticity. During the embedding phase, the digital signature is converted into watermark information and seamlessly fused with the media content, becoming an invisible component. The implementation typically involves generating a SHA-1 hash from the original data, which produces a 160-bit message digest that serves as the watermark payload. For extraction and verification, the algorithm parses the media content to retrieve the embedded watermark information, then performs digital signature validation to confirm the media's integrity and authenticity. This process may involve recalculating the SHA-1 hash of the received content and comparing it with the extracted signature. The watermarking algorithm demonstrates high efficiency, security, and stability, making it suitable for widespread applications in digital copyright protection, anti-counterfeiting traceability, and information security systems. Key functions in implementation include hash generation, watermark encoding/decoding algorithms, and signature verification routines.