Abstract: This paper proposes a watermarking algorithm based on generalized signcryption and DWT.The algorithm not only can perform signcryption quickly for watermark，but also can encrypt or sign it separately when needed，which greatly improves the security and flexibility of digital watermarking.At the same time，owing to the HVS characteristics of human eyes are considered，the algorithm’s robustness and adaptability have been ensured.The experiments have demonstrated that the proposed algorithm has advantages such as strong robustness against various image processing and attacks，not requiring the original image for watermarking detection，and good security.

Key words: generalized signcryption, digital image watermarking, DWT, adaptive quantification

摘要： 设计了一种基于广义签密和DWT的水印算法，该算法既可以对待嵌入水印进行快速签密，又可以在需要时对其进行单独的加密或签名，大大提高了数字水印的安全性和灵活性。同时，该算法考虑到人眼的HVS特性，保证了鲁棒性和自适应能力。实验表明，在不同的图像处理和多种攻击下，算法具有鲁棒性强、检测时不需要原始图像、安全性好的优点。

关键词: 广义签密, 数字图像水印, 离散小波变换, 自适应量化