Embedding multiple watermarks into a digital object enables multiple purposes to be realized. In this paper, we present a multi-party watermark embedding framework based on frequency-hopping sequences (FHSs). In the proposed work, a certain number of FHSs are generated in advance and then randomly assigned to multiple users. Each user uses an assigned FHS to embed his own watermark data into the cover object by slightly modifying the content. In this way, the resulting marked object containing multiple watermarks can be put into use. During the phase of watermark verification, each user can extract his own watermark from the marked object with the corresponding FHS without interacting with other users. Since the used FHSs can result in a very low number of element collisions, the probability of altering the same content within the digital object would be low, meaning that, the error rate of data extraction for each user will be low. Moreover, if the digital object was modified, the embedded information can be still retrieved as the FHSs provide high randomness. Experimental results have shown that, our work enables the multiple users to reliably extract their own watermark information for verification even the marked object was maliciously attacked, which verifies the superiority.

将多个水印嵌入到一个数字对象中可以实现多种用途。在本文中，我们提出了一种基于跳频序列（FHS）的多方水印嵌入框架。在建议的工作中，预先生成一定数量的 FHS，然后随机分配给多个用户。每个用户使用分配的 FHS 通过稍微修改内容将他自己的水印数据嵌入到封面对象中。这样，得到的包含多个水印的标记对象就可以投入使用了。在水印验证阶段，每个用户都可以从带有相应FHS的标记对象中提取自己的水印，而无需与其他用户交互。由于使用的 FHS 可以导致非常少的元素冲突，数字对象内相同内容被篡改的概率较低，即每个用户的数据提取错误率较低。此外，如果数字对象被修改，嵌入的信息仍然可以被检索，因为 FHS 提供了高随机性。实验结果表明，我们的工作使得多个用户即使标记对象遭到恶意攻击，也能可靠地提取自己的水印信息进行验证，验证了优越性。