WO2008128384A1

WO2008128384A1 - A smart card and a method for adding digital watermark to the interior data of the smart card

Info

Publication number: WO2008128384A1
Application number: PCT/CN2007/001359
Authority: WO
Inventors: Xin Tian; Man Liu; Xianghui Yang
Original assignee: Aigo Research Institute Of Image Computing Co., Ltd
Priority date: 2007-04-24
Filing date: 2007-04-24
Publication date: 2008-10-30

Abstract

A smart card and a method for adding digital watermark to the interior data of the smart card. The smart card includes microprocessor, memory, and includes: monitoring module, which is used for monitoring the I/O process of the write in or read out of the data and the format of the data, and sending the monitoring result to the microprocessor; and the microprocessor decides whether or not to send the instruction of embedding watermark to the watermark embedding module according to the monitoring result; watermark embedding module connected with the microprocessor, which acquires the complete data of the write in or read out and adds watermark information to the data according to the instruction sent by the microprocessor.

Description

Smart card and method for adding watermark to internal data of smart card

The present invention relates to a smart card, and more particularly to a smart card that can add watermarks to internal data.

Background technique

With the development of technology, various cards have evolved from simple sync cards to asynchronous cards, from simple EPR0M cards to smart cards (also known as CPU cards) with microprocessors. In particular, the advent of smart cards with microprocessors inside them has led to the use of its internal microprocessor chips and the development of a variety of operating systems for use inside smart cards. In this way, the smart card is more conveniently used, and management becomes easy; more importantly, the smart card itself has taken a big step toward personal computerization, opening up a broader space for the development of smart cards. Prospects.

At the same time, digital watermarking technology is becoming more and more mature today, and digital watermarking is also widely used in various devices. A system for embedding authentication information into an image and an image change detecting system are specifically disclosed in Chinese Patent Publication No. CN1091329C. This document aims to provide a digital camera having the function of embedding authentication information into an image, the authentication information being used to detect the original of the captured image. However, this method of adding watermarks requires corresponding changes to the firmware inside the digital camera, which is not applicable to ordinary digital cameras.

Summary of the invention

In order to make ordinary digital cameras and mobile phones with camera functions take pictures when taking pictures. The captured picture is added to a digital watermark such as copyright authentication information or fidelity information. It is an object of the present invention to provide a smart card capable of adding a digital watermark to internal data and a method of adding a digital watermark to the internal data of the smart card. Therefore, on the basis of not changing the original structure of the existing digital camera and the electronic device with the photographing function, the operation of adding digital watermarks such as watermark information to the image data is completed, thereby realizing data tracking.

To this end, the technical solution to solve the technical problem of the present invention is:

A smart card, including a microprocessor, a memory, further comprising:

The monitoring module is configured to monitor the format of the I/O operation and data written or read by the data, and report the monitoring result to the microprocessor; the microprocessor determines, according to the monitoring result, whether to perform the watermark embedding to the watermark embedding module. Instruction

The watermark embedding module connected to the microprocessor acquires the complete data written or read out according to the instruction issued by the microprocessor and adds watermark information to the data.

The instruction to perform watermark embedding includes information of a storage location of the data.

The watermark is stored in the memory

interest.

The watermark embedding module includes:

a data acquisition unit, configured to acquire complete data;

The watermarking information unit connected to the data acquisition unit is configured to receive data sent by the data acquisition unit, and at the same time, call the watermark information stored in the memory, and embed the watermark information into the data.

A key is also stored in the memory, and the watermark embedding module further includes an encryption unit that encrypts the watermark information by the key. When the listening module monitors that the data format of the written or read data is an image format or an audio format, a report is sent to the microprocessor to add a watermark to the data.

Another technical solution of the present invention is:

A method for adding a digital watermark to a smart card internal data includes the following steps: Step 1. The listening module listens to the I/O operation and data format written or read by the data, and sends a report to the microprocessor of the smart card according to the monitoring result;

When there is an I/O operation written or read and the data format is a specific format, the listening module sends a report to the smart card's microprocessor to add watermark to the image data; when there is no write or read When the outgoing I/O operation and/or the data format is a non-specific format, the listening module sends a report to the smart card's microprocessor that does not watermark the image data; or does not send to the smart card's microprocessor. Any report.

Step 2: The microprocessor of the smart card sends a watermarking report to the watermark embedding module according to the report of adding a watermark to the data sent by the monitoring module;

Step 3: The watermark embedding module acquires complete data according to an instruction sent by the microprocessor, and adds watermark information to the data;

Step 4. The watermark embedding module sends the new data with the added watermark information to the memory. The method for adding a digital watermark to the internal data of the smart card is characterized in that the memory in the step 4 is a memory inside the smart card or a memory of a device other than the smart card.

The instruction to perform the embedded watermark includes address information stored in the data.

The operation of adding the watermark information to the acquired data in the step 3 is as follows: Step 3. 1. Obtain the complete data according to the address stored in the data in the instruction; Step 3. 2. Call the watermark information and embed the watermark information in the data.

The step 3.2 also includes the step of encrypting the embedded watermark information.

Since the existing smart card contains a microprocessor or even an operating system, the smart card itself can realize the functions of calculation and control. Therefore, from a technical point of view, the smart card itself can realize the writing or reading of data. The data stored in the card is digitally watermarked. In this way, we do not need to change the structure of any existing camera device and need such a smart card to complete the function of adding digital watermark.

Compared with the prior art and the known patent documents, the smart card and the method for adding the digital watermark thereof according to the present invention have outstanding substantive features and significant technological progress. The invention will be described in detail with reference to the drawings and specific embodiments.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a block diagram showing the structure of a first embodiment of the present invention.

2 is a block diagram showing a structure of a watermark embedding module in a first embodiment of the present invention. 3 is a block diagram showing another structure of the watermark embedding module in the first embodiment of the present invention. Figure 4 is a block diagram showing the structural logic of the second embodiment of the present invention.

Figure 5 is a block diagram showing the structure of a watermark embedding module in a second embodiment of the present invention.

Figure 6 is a block diagram showing the structural logic of a third embodiment of the present invention.

Figure 7 is a block diagram showing the structure of a watermark embedding module in a third embodiment of the present invention.

Figure 8 is a block diagram showing the structure of a digital watermarking unit added in a third embodiment of the present invention. Figure 9 is a block diagram showing the structure logic of the fourth embodiment of the present invention. .

detailed description The first embodiment of the present invention is a smart card applied to a digital camera according to the present invention. When image data is written to the smart card, the watermark embedding module in the smart card adds watermark to the image data. As shown in FIG. 1 , the smart card includes: a smart card MPU (microprocessor), a memory, a monitoring module, and a watermark embedding module. In this embodiment, the monitoring module monitors a process in which the digital camera writes data to the smart card, when there is image data to When the I/O operation written by the smart card occurs and the complete image is delivered, the monitoring module reports the monitoring result to the MPU of the smart card, and the report is information for adding watermark to the data. The MPU sends an instruction to perform image processing to the watermark embedding module, the instruction to perform watermark embedding containing information of a storage location of the data. After receiving the instruction, the watermark embedding module acquires image data as shown in FIG. 2, and sends the acquired image to the watermarking information unit. When the watermark information unit receives the image data, the unit goes to the smart card. The preset watermark information is called in the memory watermark information area, and the watermark information is preset in the card, and the watermark information may be added to the card by using a third party software connected to the PC, or the card number of the card itself is used as a watermark. The way of information is realized. When adding a watermark, it is only necessary to obtain the watermark information. For example: The watermark information can be set to "Zhang San Copyright". The watermark information unit is added to add the watermark information of the "Zhangsan Copyright" to the image data, and the new data with the watermark information of "Zhangsan Copyright" is added. This new data is resent to the smart card's memory for storage. At this time, the data read from the smart card memory is new data added with the "Zhang San Copyright" watermark.

When there is no I/O operation written or read out and/or the data format is a format that is not specific as an image in this embodiment, the listening module sends to the microprocessor of the smart card not to add the image data. Watermark report; or not sent to the smart card's microprocessor How to report.

As shown in Figure 3, for security reasons, we can also encrypt the watermark information. That is, the key is also stored in advance in the corresponding storage area of the smart card through the PC. In the encryption unit in the watermark embedding module, the watermark information of the key "Zhangsan Copyright" is encrypted, and an encrypted new watermark information is obtained, and the new watermark information is added to the image data to obtain New data, sent to memory storage.

As shown in FIG. 4, the second embodiment of the present invention is a smart card applied to a voice recorder of the present invention. When the audio data is read from the smart card, the watermark information is directly added in the watermark information unit in the smart card watermark embedding module. Into the image data.

Smart cards include: smart card MPU (microprocessor), memory, monitor module and watermark embedding module. The monitoring module monitors the process of reading data from the smart card memory. When an I/O operation in which audio data is read from the smart card memory occurs and is complete data, the monitoring module reports the monitoring result to the MPU of the smart card, if Non-audio data or incomplete data is not reported to the smart card MPU. After receiving the report sent by the monitoring module, the MPU sends an instruction to perform watermarking information to the watermark embedding module. After the watermark embedding module receives the instruction, as shown in FIG. 5, the data acquiring unit acquires the data, and sends the acquired image to the watermarking information unit. When the watermarking information unit receives the audio data, the watermark information unit is added. The memory in the smart card stores the watermark information preset in the watermark information area, and when the watermark is added, the watermark information may be acquired. For example: The watermark information can be set to "Li Si Copyright". Adding a digital watermark unit adds the watermark information of this "Li Si Copyright," to the data, and obtains new data adding the iceprint information of "Li Si Copyright." and outputs the new data from the smart card. As shown in FIG. 6, in the third embodiment of the present invention, a smart card applied to a digital camera, in the present embodiment, watermark information added to the internal data in the card is obtained by encrypting the image data itself by a key. The digital camera sends the data to the smart card. The listening module listens to this process and reports to the MPU of the smart card, and the smart card MPU sends an instruction to the watermark embedding module. As shown in FIG. 7, the data acquisition unit obtains data and transmits the data to the watermark information unit. As shown in FIG. 8, the area dividing unit divides the image data into D1 and D2 areas, and sends D2 to the hidden unit. Meanwhile, the D1 area is separately sent to the area combining unit and the digest computing unit, and the digest computing unit obtains the feature value H. And sending to the encryption unit; the encryption unit receives the feature value H, and simultaneously calls the key K built in the smart card memory, and encrypts the feature value H with the key K in the encryption unit to obtain a new feature value Η, and The H is sent to the hidden unit; the hidden unit hides H, hides into the D2 area to obtain the D2, the area, and sends the D2, area to the area combining unit; the area combining unit combines D1 and D2 to obtain the original image data. The same on the surface but actually the new image data that encrypts the D2 area; the area combining unit sends the new image data to the memory of the smart card to complete the image watermarking operation, so that the data read from the memory of the smart card is Watermarked image data.

As shown in FIG. 9, which is a fourth embodiment of the present invention, the difference from the third embodiment is that the listening module is a process of listening to the memory of the smart card to output data outward, when data is output from the memory and is complete data. When the monitoring module reports to the smart card MPU, the MPU sends an instruction to the watermark embedding module, and the watermark embedding module receives the instruction to perform image processing. The process of image processing is the same as that of the third embodiment, and finally the watermark embedding module is externally The device sends new data and completes the digital watermarking operation of the smart card. In the watermark embedding module of the present invention, after the watermark is added to the data, the new data added with the watermark information is returned to the memory of the smart card, and the new data is made to be monitored and recognized by the monitoring module. When the listening module listens to the data to be written or read, such as image or audio data, which has the identification information added by the smart card, the listening module does not send any report to the smart card's microprocessor or sends "Do not add the data. 4 notices of watermarks.

The data acquiring unit in the present invention can extract data by: when the micro-processing of the smart card includes the storage address of the data in the instruction for executing the watermarking information sent by the watermark embedding module, the data acquiring unit of the watermark embedding module The data is called based on the storage address of the data.

When the micro-processing of the smart card does not include the storage address of the data in the instruction for performing the watermarking information sent by the watermark embedding module, the watermark embedding module requests the storage address of the data from the microprocessor or sends the "request data" to the micro-processor. The instructions are controlled by the microprocessor to send data directly to the data acquisition unit of the watermark embedding module.

The method for adding a digital watermark to the internal data of the smart card comprises the following steps: Step (1) The monitoring module listens to the I/O operation and data format of the data writing or reading, and sends the data to the microprocessor of the smart card according to the monitoring result. Report

When there is an I/O operation written or read and the data format is a specific format, the listening module sends a report to the smart card's microprocessor to add watermark to the image data; when there is no write or read When the I/O operation and/or the data format is a non-specific format, the listening module sends a report that does not add watermark to the image data to the microprocessor of the smart card; or does not send to the microprocessor of the smart card Any report. Step (2) the microprocessor of the smart card receives the watermarking report sent by the monitoring module, and sends an instruction to execute the watermark embedding to the watermark embedding module; and (3) the watermark embedding module sends the data according to the microprocessor. An instruction to obtain complete data and add watermark information to the data;

Step (4) The watermark embedding module sends the new data with the added watermark information to the memory.

The memory described in the step (4) is a memory inside the smart card or a memory of another device other than the smart card.

The operation of adding watermark information to the acquired data in the step (3) is: (3.1) acquiring complete data according to the address stored in the data in the instruction; (3. 2) calling the watermark information, embedding the watermark information In the data described.

The step (3.2) further includes the step of adding the embedded watermark information.

In view of the above, various other changes and modifications can be made in accordance with the technical solutions and technical concept of the present invention, and all such changes and modifications should belong to the present invention. The scope of protection required.

Claims

Claim

A smart card, comprising a microprocessor, and a memory, further comprising: a monitoring module, configured to monitor an I/O operation and data format of data writing or reading, and report the monitoring result to the microprocessor The microprocessor determines, according to the monitoring result, whether to send an instruction to perform watermark embedding to the watermark embedding module;

2. A smart card according to claim 1 wherein said instructions for performing watermark embedding comprise information of a storage location of said data.

3. The smart card according to claim 1, wherein the memory has a watermark

4. The smart card of claim 3, wherein the watermark embedding module comprises:

a data acquisition unit, configured to acquire complete data;

5. The smart card of claim 4, wherein the memory further has a key, the watermark embedding module further comprising a force for encrypting the watermark information based on the key. Close unit.

6. The smart card according to claim 1, wherein: when the listening module monitors that the data format of the written or read data is an image format or an audio format, The processor sends a report that adds watermarks to the data.

7. A method of adding a digital watermark to internal data of a smart card, comprising the steps of:

Step 1. The monitoring module monitors the I/O operation and data format written or read by the data, and sends a report to the microprocessor of the smart card according to the monitoring result;

Step 2: The microprocessor of the smart card sends a watermark report to the watermark embedding module according to the report of adding a watermark to the data sent by the monitoring module;

Step 4. The watermark embedding module sends the new data with the added watermark information to the memory.

8. The method of adding a digital watermark to smart card internal data according to claim 7, wherein the memory in step 4 is a memory inside the smart card or a memory of a device other than the smart card.

9. The method of adding a digital watermark to internal data of a smart card according to claim 7, wherein said instruction to perform watermark embedding includes address information stored in data.

10. The method for adding a digital watermark to the internal data of the smart card according to claim 9. The method is characterized in that the step of adding watermark information to the acquired data in the step 3 is:

Step 3. 1. Obtain the complete data according to the address stored in the data in the instruction;

Step 3. 2. Call the watermark information and embed the watermark information in the data.

A method for adding a digital watermark to smart card internal data according to claim 10, wherein said step 3.2 further comprises the step of encrypting the embedded watermark information.