Abstract:
La présente invention concerne un procédé de certification et d'authentification ultérieure de documents originaux physiques ou numériques. Le concept de la preuve repose sur la dualité d'une information physique et d'une information numérique, l'une étant le témoin de l'autre qui est non modifiable au risque de perdre la preuve. A un document original physique (8) associé à un scellé à bulles (7) correspond une contre partie témoin dématérialisée horodatée et propriétaire. A un document original numérique (15) horodaté et propriétaire correspond une contre partie témoin matérialisée par un scellé à bulles (7).
Abstract:
The present invention is a method (Fig. 1) for hiding data in document contents. The method comprises receiving information relating to the document contents, (102) , wherein at least part of the document contents are of a binary nature, converting the data to halftone pixel groups according to predefined binary classifications associated with combinations of halftone pixels, (104), and embedding the halftone pixel groups into a binary portion of the document contents (104 and 114). Further, the present invention is a method for extracting data hidden in document contents (Fig. 7) The method comprises receiving information relating to the document contents (702), wherein the document contents include halftone pixel groups, extracting the halftone pixel groups from the document contents (712), and converting the halftone pixel groups to the data according to predefined binary classifications associated with combinations of halftone pixels (714).
Abstract:
The work to be protected by the watermark is first digitized (10), and then the baseline watermark vector is derived (12) and stored (14). Also, a watermark offset vector is created (16) and stored (18). The watermark offset vector and the baseline watermark vector are added together to generate a modified watermark vector (20). Next, the baseline watermark vector is replaced by the modified watermark vector in the digitized work to be protected (22). Finally, the watermarked work is returned to its original form (24).
Abstract:
본 발명은 정보 신호내에 보조 데이터를 삽입하는 방법 및 장치에 관한 것이다. 보조 데이터를 나타내는 노이즈 신호의 단지 일부가 삽입되지만 완성 노이즈 신호가 검출될 수 있다. 이것은 삽입된 신호의 큰 패이로드를 허용한다. 또한 본 발명은 정보 신호 내의 보조 데이터를 검출하는 대응하는 방법 및 장치에 관한 것이다.
Abstract:
PURPOSE: A method and apparatus for embedding a text for issuance and certification of a digital certificate is provided to enable certification of a digital certificate, which is dealt in various on-line/off-line, to be performed in a more trustworthy manner. CONSTITUTION: At least a part of the first type data is converted into a bit stream. The second type data is converted into a one-dimensional data. The one-dimensional data is transformed based on bit values of the bit stream to generate a temporary data. The temporary data is restored to the second type. The second type data is replaced by the restored temporary data. The first type data is a text and the second type data is an image. The transformation is made using a modulus operator. Each unit data of the one-dimensional data is calculated by using the modulus operator. A remainder is compared with a bit value of the bit stream. If the remainder is the same as the bit value of the bit stream, the unit data is maintained. However, if the remainder is not the same as the bit value, 1 is added to the unit data so as to be transformed.
Abstract:
Multiple transform utilization and applications for secure digital watermarking In one embodiment of the present invention, digital blocks in digital information to be protected are transformed into the frequency domain using a fast Fourier transform. A plurality of frequencies and associated amplitudes are identified for each of the transformed digital blocks and a subset of the identified amplitudes is selected for each of the digital blocks using a primary mask from a key. Message information is selected from a message using a transformation table generated with a convolution mask. The chosen message information is encoded into each of the transformed digital blocks by altering the selected amplitudes based on the selected message information.
Abstract:
Multiple transform utilization and applications for secure digital watermarking In one embodiment of the present invention, digital blocks in digital information to be protected are transformed into the frequency domain using a fast Fourier transform. A plurality of frequencies and associated amplitudes are identified for each of the transformed digital blocks and a subset of the identified amplitudes is selected for each of the digital blocks using a primary mask from a key. Message information is selected from a message using a transformation table generated with a convolution mask. The chosen message information is encoded into each of the transformed digital blocks by altering the selected amplitudes based on the selected message information.
Abstract:
A method of embedding information in digital content representing media streams. The method includes (1) selecting a set of locations within that digital content reprensenting the media stream to embed information, (2) selecting a set of possible alterations to make at those locations, and (3) making a subset of the possible alterations. The set of locations and possible alterations is herein sometimes called a “watermark.” The subset of actual alterations that are made is herein sometimes called a “fingerprint.” The method determines a set of locations at which there are alternative versions of digital content representing the same media stream, such as one being the original and one being an alternative version of the same digital content, herein sometimes called the “original movie” and the “alt-movie,” or herein sometimes called the “original block” and the “alt-block” for a particular block in the digital content representing the media stream.
Abstract:
Multiple transform utilization and applications for secure digital watermarking. In one embodiment of the present invention, digital blocks in digital information to be protected are transformed into the frequency domain using a fast Fourier transform. A plurality of frequencies and associated amplitudes are identified for each of the transformed digital blocks and a subset of the identified amplitudes is selected for each of the digital blocks using a primary mask from a key. Message information is selected from a message using a transformation table generated with a convolution mask. The chosen message information is encoded into each of the transformed digital blocks by altering the selected amplitudes based on the selected message information.
Abstract:
A computer is provided with an application and a printer driver. A user of the computer generates image data using the applications. When the image data is for a plurality of pages, the user selects a desired watermark for each of the plurality of pages. The printer driver converts the image data into print data, and combines selected watermarks with the print data for corresponding pages, thereby generating updated print data. The updated print data is output as a single print job to the printer. The printer executes printing operations based on the print job so as to print an image on a plurality of pages, each formed with a corresponding watermark.