数字水印在信息安全方面的应用

The Application of Digital Watermarking in Information Security

随着多媒体信息处理技术和互联网的快速发展,人们在生活中经常会通过语音信号来传递信息。语音信号在传输过程中容易被恶意篡改而失真,如果对语音篡改的内容涉及国家安全、法庭举证、医学等一系列重要数据,篡改后的语音将会给社会造成极大的影响,进而造成重大的损失。因此,识别语音信号的完整性并恢复被篡改的语音信号已成为一个公共问题。语音水印技术通过将附加信息(水印)嵌入原始语音中,是一种解决语音信号身份验证和篡改检测问题的方案。当原始语音被恶意篡改时,嵌入的水印可以帮助检测篡改的痕迹并找到篡改的位置。此外,还可以将一些恢复信息嵌入原始语音中,使水印拥有篡改恢复的能力。

With the rapid development of multimedia information processing technology and Internet,people often transmit information through voice signals in their lives.Speech signal is easy to be distorted by malicious tampering in the transmission process.If the content of speech tampering involves a series of important data,such as national security,court evidence,medicine,etc.,the tampered speech will have a great impact on the society,and then cause significant losses.Therefore,it has become a common problem to recognize the integrity of speech signal and recover the tampered speech signal.By embedding the additional information(watermark)into the original speech,the speech watermarking technology is a solution to the problem of speech signal authentication and tamper detection.When the original voice is tampered with maliciously,the embedded watermark can help detect the tampering trace and find the tampering location.In addition,some recovered information can be embedded in the original voice,so that the watermark has the ability of tampering recovery.