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Symmetric watermarking in network security refers to the process of embedding a watermark into digital data using the same secret key for both embedding and extraction. The watermark is an additional piece of hidden information inserted into digital content such as images, audio, video, or even network traffic, with the purpose of authentication, copyright protection, or data integrity verification. Since the same key is required to insert and later detect or extract the watermark, the technique is termed symmetric, in a similar way to symmetric cryptography. In practice, symmetric watermarking begins with the selection of a watermark, which may ____ _____ __________ _______ _____ ____.
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