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Symmetric watermarking in the context of network security refers to a cryptographic technique where the same key is used both for embedding the watermark into digital content and for extracting or verifying it later. A watermark in digital security is a hidden piece of information embedded within data such as images, audio, video, or even network packets, which is not easily perceivable by unauthorized users but can be retrieved or verified by authorized entities. The purpose of symmetric watermarking is to provide authentication, copyright protection, and integrity assurance for digital content _______ ____ ______ ________ _______ __________ ________ _________ ____ ____.
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