KR20080094341A - Method and apparatus for digital wartermarking - Google Patents

Abstract

A method and an apparatus for digital water marking are provided to transfer media data safely, by using the metadata certification code as a water mark when a metadata certification code is inserted into the media data. Anonym information generator generates anonym information of a user from an ID of the user(S310). A certification code generator generates a media certification code for verifying the integrity of media data(S320). A metadata generator collects the anonym information of the user, the media certification code, and attribution information of the media data, to generate metadata of the media data(S330). When the generation of the metadata is finished, the certification code generator generates a metadata certification code for verifying the integrity of the metadata(S340). A water marking-performing unit inserts the metadata certification code into the media data to generate marked media data(S350). A media file generator encodes the marked media data and the media data to generate a media file(S360).

Description

Method and apparatus for digital watermarking {Method and apparatus for digital wartermarking}

1 is a diagram showing the configuration of a digital watermarking apparatus according to an embodiment of the present invention.

2 is a diagram illustrating a configuration of an apparatus for verifying a media file according to an embodiment of the present invention.

3 is a flowchart illustrating a digital watermarking method according to an embodiment of the present invention.

4 is a flowchart illustrating a media file verification method according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: digital watermarking device 110: input unit

120: anonymous information generating unit 130: metadata generating unit

140: authentication code generation unit 150: watermarking performing unit

160: media file generation unit 200: media file verification apparatus

210: media file processing unit 220: watermark extraction unit

230: authentication code generation unit 240: verification unit

250: control unit

The present invention relates to digital watermarking, and more particularly, to a digital watermarking method and apparatus capable of providing integrity of an original digital content and author anonymity.

With the expansion of the Internet, information can be easily shared, while music and video can be easily and conveniently manipulated or transmitted to others using digital technology without any quality changes.

Recently, copyright protection technologies have been developed to prevent such illegal copying and distribution of illegal copies, and interest in the Internet contents service companies and copyright holders of these contents is increasing.

Digital watermarking uses the principle of watermarks to prevent counterfeit bills by inserting certain pictures while wet during the bill making process. It is a technology introduced in digital content. In other words, digital watermarking is a technology that can identify who is the copyright holder by inserting different information, which is not distinguished by human visual or auditory, into digital content such as audio, video, and image. Digital watermarking technology developed to date can be classified into audio watermarking, image watermarking, video watermarking, text watermarking, etc. according to the medium into which the watermark is inserted.

In the conventional digital watermarking technology, feature information (Media Feature) extracted from original digital content is used as a watermark and inserted into original digital content. As a result of extracting and comparing feature information and watermark from the marked digital contents, if the two values match each other, the marked digital contents are regarded as the same as the original digital contents, thereby verifying the marked digital contents. Can be done.

However, since the conventional digital watermarking technology inserts a watermark within a range that minimizes deformation of the original digital content, the amount of information that can be inserted into the digital content is very limited. There is a problem that it is difficult to cope with the situation that the service using digital content is increasing.

In addition, the conventional digital watermarking technology can verify the characteristic information of the original digital content, but does not provide a means for providing the integrity of the original digital content and the author's anonymity.

An object of the present invention is to provide a digital watermarking method and apparatus that can provide the integrity of an original digital content and anonymity of an author.

However, the objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, the digital watermarking apparatus according to an embodiment of the present invention inserts a metadata authentication code generated using metadata of media data into the media data as a watermark to generate marked media data. And a water file performing unit, and a media file generating unit generating a media file by encoding the marked media data and the metadata.

In order to achieve the above object, a digital watermarking method according to an embodiment of the present invention includes inserting a metadata authentication code generated using metadata of media data into the media data as a watermark to generate marked media data. And generating a media file by encoding the marked media data and the metadata.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, and only the embodiments make the disclosure of the present invention complete, and the general knowledge in the art to which the present invention belongs. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, the present invention will be described with reference to a block diagram or a flowchart illustrating a digital watermarking method and apparatus according to an embodiment of the present invention. At this point, it will be understood that each block of the flowchart illustrations and combinations of flowchart illustrations may be performed by computer program instructions. Since these computer program instructions may be mounted on a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, those instructions executed through the processor of the computer or other programmable data processing equipment may be described in flow chart block (s). It creates a means to perform the functions.

These computer program instructions may be stored in a computer usable or computer readable memory that can be directed to a computer or other programmable data processing equipment to implement functionality in a particular manner, and thus the computer usable or computer readable memory. It is also possible for the instructions stored in to produce an article of manufacture containing instruction means for performing the functions described in the flowchart block (s). Computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operating steps are performed on the computer or other programmable data processing equipment to create a computer-implemented process to create a computer or other programmable data. Instructions for performing the processing equipment may also provide steps for performing the functions described in the flowchart block (s).

In addition, each block may represent a portion of a module, segment, or code that includes one or more executable instructions for executing a specified logical function (s). It should also be noted that in some alternative implementations, the functions noted in the blocks may occur out of order. For example, the two blocks shown in succession may in fact be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending on the corresponding function.

1 is a diagram illustrating a configuration of a digital watermarking apparatus 100 according to an embodiment of the present invention.

The digital watermarking apparatus 100 according to an embodiment of the present invention generates metadata by collecting media authentication information, which is authentication information on media data, anonymous information of a user, and other information related to attributes of the media data, Marked media data can be generated by inserting the metadata authentication information for the metadata into the media data as a watermark. The media file may be generated by encoding the marked media data and the metadata. To this end, as shown in FIG. 1, the digital watermarking apparatus 100 performs an input unit 110, an anonymous information generating unit 120, a metadata generating unit 130, an authentication code generating unit 140, and watermarking. The unit 150 may include a media file generator 160 and a controller 170.

The input unit 110 may receive user information, for example, a user ID. To this end, the input unit 110 may be provided with a plurality of keys. The user ID input through the input unit 110 may be provided to the anonymous information generating unit 120 to be described later.

The anonymous information generating unit 120 may generate anonymous information of the user from the received user ID. The generated anonymous information may be provided to the metadata generating unit 130 to be described later.

The metadata generator 130 may generate information related to media data and generate metadata. In detail, the metadata generating unit 130 may determine the media authentication code generated by the authentication code generating unit 140, the anonymous information of the user generated by the anonymous information generating unit 120, and the attributes of the media data. Metadata may be generated by collecting information indicating the information. The generated metadata may be provided to the authentication code generator 140 to be described later and the media file generator 160 to be described later.

The authentication code generator 140 may generate a metadata authentication code for the provided metadata. Here, the metadata authentication code refers to information that can prove that the original metadata has not been changed. The metadata authentication code may be generated by, for example, a hash function. The metadata authentication code generated in this manner may be provided to the watermarking unit 150 to be described later and inserted into media data. It can be used as a watermark to be.

In addition, the authentication code generation unit 140 may generate a media authentication code. Here, the media authentication code is information that can prove that the media data has not been changed. For example, the media authentication code may be generated by a hash function. The media authentication code may be collected by the above-described metadata generating unit 130 and used to generate metadata.

The watermarking performing unit 150 may insert the metadata authentication code provided from the authentication code generating unit 140 as a watermark and insert it into the media data. As a result, marked media data can be generated. The marked media data may be provided to the media file generator 160 to be described later.

The media file generator 160 may generate a media file by encoding the marked media data provided from the watermark processor and the metadata provided from the metadata generator 130.

The controller 170 may connect and manage components in the digital watermarking apparatus 100. For example, the controller 170 may provide the media authentication code generated by the authentication code generator 140 to the metadata generator 130, and the metadata generated by the metadata generator 130. It may be provided to the authentication code generator 140 to generate a metadata authentication code. When the metadata authentication code is generated, the controller 170 may provide the metadata authentication code to the watermarking performing unit 150 to be inserted into the media data.

2 is a diagram illustrating a configuration of an apparatus for verifying a media file according to an embodiment of the present invention.

The media file verification apparatus 200 according to the embodiment of the present invention may verify the integrity of the media file generated by the digital watermarking apparatus 100. To this end, as illustrated in FIG. 2, the media file verification apparatus 200 includes a media file processor 210, a watermark extractor 220, an authentication code generator 230, a verifier 240, and a controller ( 250).

The media file processor 210 may decode the provided media file and separate the media file and the marked media data. In this case, the marked media data may be provided to the watermark extractor 220 to be described later, and the metadata may be provided to the authentication code generator 230 to be described later.

The watermark extractor 220 may extract a watermark from the marked media data. The extracted watermark corresponds to a metadata authentication code generated by the digital watermarking apparatus 100 and may be provided to the verification unit 240.

The authentication code generator 230 may generate a metadata authentication code with respect to the metadata provided from the media file processor 210. For example, the authentication code generator 230 may generate a metadata authentication code by using a hash function. The metadata authentication code generated by the authentication code generator 230 may be provided to the verification unit 240 to be described later.

The verification unit 240 may include the metadata authentication code generated by the authentication code generator 230 and the watermark extracted by the watermark extractor 220, that is, the meta generated by the digital watermarking apparatus 100. By comparing the data authentication code, it is possible to verify the integrity of the metadata for the provided media file. That is, it may be determined whether the metadata of the provided media file is the same as the metadata of the original media file.

Specifically, the metadata authentication code generated by the authentication code generator 230 and the watermark extracted by the watermark extractor 220, that is, the metadata authentication code generated by the digital watermarking apparatus 100 If they match, the verification unit 240 may determine that the metadata of the provided media file is intact.

As such, when the integrity of the metadata is confirmed, the verification unit 240 may regard the media data of the provided media file as intact. Because, the same metadata authentication code means that the metadata is the same, which means that the information included in the metadata, that is, the user's anonymous information, and the media authentication code, which is an authentication code for the media data, are all included. Because it means the same.

If the metadata authentication code generated by the authentication code generation unit 230 and the watermark extracted by the watermark extraction unit 220 do not coincide with each other, the verification unit 240 may determine the metadata of the provided media file. It may be determined that the data is not the same as the metadata of the original media file. At the same time, it may be determined that the media data of the provided media file is not the same as the media data of the original media file.

The controller 250 may connect and control the components of the media file verification apparatus 200 with each other. Specifically, when the media file is decoded and separated into metadata and marked media data, the controller 250 may request the authentication code generator 230 to generate a metadata authentication code for the separated metadata. The watermark extractor 220 may request the watermark extractor 220 to extract the watermark from the marked media data.

In addition, the controller 250 may verify the anonymous information of the author. Specifically, when the provided media file is separated into metadata and marked media data, the controller 250 detects anonymous information of the user from the separated metadata, and converts the detected anonymous information into a third trusted authority (TTP; Trusted). By requesting a third party (not shown), the author's personal information can be verified while the author's personal information is protected.

3 is a flowchart illustrating a digital watermarking method according to an embodiment of the present invention.

First, when a user ID is input from the user, the anonymous information generating unit 120 generates anonymous information of the user from the received user ID (S310). In addition, the authentication code generation unit 140 generates a media authentication code that is information that can verify the integrity of the media data (S320). In this case, the authentication code generation unit 140 may utilize the hash value obtained by applying the hash function to the media data as the media authentication code.

The metadata generating unit 130 collects information about the anonymous information of the user generated by the anonymous information generating unit 120, the media authentication code generated by the authentication code generating unit 140, and the attributes of the media data. In operation S330, metadata of the media data is generated.

When the metadata generation is completed, the authentication code generation unit 140 generates a metadata authentication code which is information for verifying the integrity of the metadata (S340). Specifically, the authentication code generation unit 140 may apply a hash function to the metadata, and utilize the resulting hash value as the metadata authentication code. The metadata authentication code generated in this way can be utilized as a watermark for media data.

The watermarking performing unit 150 inserts the metadata authentication code generated by the authentication code generating unit 140 into the media data to generate the marked media data (S350).

The media file generator 160 may generate the media file by encoding the marked media data and the metadata generated by the metadata generator 130 (S360).

Next, FIG. 4 is a flowchart illustrating a media file verification method according to an embodiment of the present invention.

When the media file is provided, the media file processor 210 decodes the provided media file (S410). When decoding is complete, the media file is separated into metadata and marked data.

The watermark extractor 220 extracts a watermark from the marked media data (S420). The watermark extracted in step S420 corresponds to a metadata authentication code generated by the digital watermarking apparatus 100.

On the other hand, the authentication code generation unit 230 generates a metadata authentication code using the separated metadata (S430). To this end, the authentication code generator 230 may apply a hash function to the provided metadata, and use the resulting hash value as the metadata authentication code.

The verification unit 240 is a watermark extracted by the watermark extraction unit 220, that is, the metadata authentication code generated by the digital watermarking apparatus 100, and the metadata generated by the authentication code generator 230 Compare the data authentication code (S440).

As a result of the comparison, when the two metadata authentication codes coincide with each other (S440), the verification unit 240 determines that the metadata of the provided media file is intact (S450). That is, it is determined that the metadata of the provided media file is the same as the metadata of the original media file. As such, when the integrity of the provided metadata of the media file is confirmed, the verification unit 240 determines that the media data separated from the media file is also intact.

As a result of the comparison, when the two metadata authentication codes do not coincide with each other (S440, NO), the verification unit 240 determines that the metadata of the provided media file is not intact (S460). That is, it is determined that the metadata of the provided media file is not the same as the metadata of the original media file. As such, when the metadata of the provided media file is not intact, the verification unit 240 determines that the media data separated from the media file is also intact.

The digital watermarking method and apparatus according to the embodiment of the present invention have been described above. Those skilled in the art will appreciate that the present invention can be embodied in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. The scope of the present invention is indicated by the scope of the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and the equivalent concept are included in the scope of the present invention. Should be interpreted.

According to the digital watermarking method and apparatus according to the embodiment of the present invention, the following effects are obtained.

By adding the authentication code for the media data and the author's anonymous information to the metadata, and inserting the authentication code for the metadata as a watermark into the media data, the media data can be delivered securely and the personal information of the media data authoring can be transferred. I can protect it.

Claims (5)

A watermarking unit which inserts a metadata authentication code generated using metadata of media data into the media data as a watermark to generate marked media data; And And a media file generator for generating a media file by encoding the marked media data and the metadata. The method of claim 1, And the metadata includes at least one of anonymous information of a producer who produced the media data and a media authentication code generated using the media data. The metadata authentication code generated by using the metadata of the media data decodes a media file including the metadata and the first media data inserted into the media data as a watermark, and converts the media file into the first media data and the metadata. A separate media file processor; And And a verification unit that determines that the media file is intact when the metadata authentication code generated by using the separated metadata and the watermark extracted from the first media data match. Inserting a metadata authentication code generated using metadata of media data into the media data as a watermark to generate marked media data; And And encoding the marked media data and the metadata to generate a media file. A metadata authentication code generated using metadata of media data is decoded first media data having a watermark embedded in the media data and a media file including the metadata to decode the first media data and the metadata. Separating into; And And determining that the media file is intact when the metadata authentication code generated by using the separated metadata and the watermark extracted from the first media data match.

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