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公开(公告)号：US06208735B1
公开(公告)日：2001-03-27
申请号：US09239240
申请日：1999-01-28
IPC分类号： G09C500
CPC分类号： H04H20/31 , G06T1/0028 , G06T1/005 , G06T2201/0052 , G06T2201/0063 , G06T2201/0081 , G11B20/00891 , H04N19/467 , H04N21/23892 , H04N21/8358
摘要： Digital watermarking of audio, image, video or multimedia data is achieved by inserting the watermark into the perceptually significant components of a decomposition of the data in a manner so as to be visually imperceptible. In a preferred method, a frequency spectral image of the data, preferably a Fourier transform of the data, is obtained. A watermark is inserted into perceptually significant components of the frequency spectral image. The resultant watermarked spectral image is subjected to an inverse transform to produce watermarked data. The watermark is extracted from watermarked data by first comparing the watermarked data with the original data to obtain an extracted watermark. Then, the original watermark, original data and the extracted watermark are compared to generate a watermark which is analyzed for authenticity of the watermark.
摘要翻译： 音频，图像，视频或多媒体数据的数字水印通过将视频不可察觉的方式将水印插入数据分解的感知重要组件来实现。 在优选的方法中，获得数据的频谱图像，优选数据的傅里叶变换。 将水印插入到频谱图像的感知重要组件中。 对所得水印的光谱图像进行逆变换以产生水印数据。 通过首先将水印数据与原始数据进行比较，从水印数据中提取水印，以获得提取的水印。 然后，将原始水印，原始数据和提取的水印进行比较，生成水印的真实性。
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公开(公告)号：US5930369A
公开(公告)日：1999-07-27
申请号：US926720
申请日：1997-09-10
IPC分类号： H04N1/387 , G06F21/10 , G06T1/00 , G09C5/00 , G10L13/00 , G10L19/018 , G10L25/51 , H04H20/31 , H04N1/32 , H04N7/08 , H04N7/24 , H04N7/26 , H04N7/52 , H04L9/00
CPC分类号： H04H20/31 , G06T1/0028 , G06T1/005 , H04N1/32154 , H04N1/3216 , H04N1/32165 , H04N1/3217 , H04N1/32197 , H04N1/3232 , H04N19/00 , H04N21/23892 , H04N21/8358 , H04N7/08 , H04N7/24 , H04N7/52 , G06T2201/0052 , G06T2201/0063 , G06T2201/0065 , G06T2201/0202 , G11B20/00891 , G11B20/00913 , H04N19/39 , H04N2201/3233 , H04N2201/327
摘要： Digital watermarking of audio, image, video or multimedia data is achieved by inserting the watermark into the perceptually significant components of a decomposition of the data in a manner so as to be visually imperceptible. In a preferred method, a frequency spectral image of the data, preferably a Fourier transform of the data, is obtained. A watermark is inserted into perceptually significant components of the frequency spectral image. The resultant watermarked spectral image is subjected to an inverse transform to produce watermarked data. The watermark is extracted from watermarked data by first comparing the watermarked data with the original data to obtain an extracted watermark. Then, the original watermark, original data and the extracted watermark are compared to generate a watermark which is analyzed for authenticity of the watermark.
摘要翻译： 音频，图像，视频或多媒体数据的数字水印通过将数字水印插入数据分解的感知有意义的组成部分中以使其在视觉上不被察觉的方式来实现。 在优选的方法中，获得数据的频谱图像，优选数据的傅里叶变换。 将水印插入到频谱图像的感知重要组件中。 对所得水印的光谱图像进行逆变换以产生水印数据。 通过首先将水印数据与原始数据进行比较，从水印数据中提取水印，以获得提取的水印。 然后，将原始水印，原始数据和提取的水印进行比较，生成水印的真实性。
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公开(公告)号：US5495532A
公开(公告)日：1996-02-27
申请号：US293363
申请日：1994-08-19
申请人： Joseph J. Kilian , Kazue Sako
发明人： Joseph J. Kilian , Kazue Sako
CPC分类号： G07C13/00 , H04L9/008 , H04L9/3218 , G06F7/725 , H04L2209/463
摘要： A number-theoretic based algorithm provides for secure electronic voting. A voter may cast a votes among n centers in a manner which prevents fraud and authenticates the votes. Preprocessing allows for nearly all of the communication and computation to be performed before any voting takes place. Each center can verify that each vote has been properly counted. The algorithm is based on families of homomorphic encryptions which have a partial compatibility property. The invention can be realized by current-generation PCs with access to an electronic bulletin board.
摘要翻译： 基于数论的算法提供安全的电子投票。 选民可以在n个中心之间投票，以防止欺诈和认证投票。 预处理允许在进行任何投票之前执行几乎所有的通信和计算。 每个中心都可以验证每次投票是否被正确计算。 该算法基于具有部分兼容性的同态加密族。 本发明可以通过具有访问电子公告板的当前一代PC来实现。
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