中文说明：利用HASH（采用sha-1算法）算法原理，设计数字签名的水印算法，完成嵌入、（提取）验证，
English Description：
Based on the principle of hash (SHA-1 algorithm), a digital signature watermarking algorithm is designed to complete the embedding and extraction verification,
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中文说明：利用HASH（采用sha-1算法）算法原理，设计数字签名的水印算法，完成嵌入、（提取）验证，
English Description：
Based on the principle of hash (SHA-1 algorithm), a digital signature watermarking algorithm is designed to complete the embedding and extraction verification,