CN102075928A - Intelligent terminal, receiving end and method for countersigning by using intelligent terminal - Google Patents

Abstract

The present invention provides a method for countersigning by using an intelligent terminal, which includes: receiving the signature of the countersigner, adding the signature to the document to be signed; making a digital watermark, and adding the digital watermark to the document through a preset algorithm. In the file, send the file to the recipient of the countersignature. The invention provides an intelligent terminal and a digital watermark receiving end. The countersign of the invention has high confidentiality, strong portability and universality.

Description

An intelligent terminal, a receiving terminal, and a method for countersigning by using an intelligent terminal

technical field

The invention relates to the field of mobile communication, in particular to an intelligent terminal, a receiving terminal and a method for countersigning by using the intelligent terminal.

Background technique

After more than 20 years of development, terminals have become more and more powerful, and now they have developed into the stage of intelligent terminals. The functions of peripherals are getting stronger and stronger, the processing speed of chips is getting faster and faster, and the capacity of memory is getting bigger and bigger, which can realize many functions that were originally wanted but could not be realized. As a high-end smart terminal, its office assistance functions have been increasingly favored by business people.

Transactions are frequent and often require signatures and seals. When the countersigner is on a business trip and cannot deal with it face to face, he can only send the document to be signed by email -> print -> the countersigner's signature -> fax back the signed document or scan it After signing the document and sending it back by mail, if the return receipt of mail or fax is counterfeited, it will cause great losses to commercial activities.

In short, the current off-site text signature has the following defects:

1. Easy to counterfeit;

2. The portability of the equipment is poor, printers and scanners cannot be carried around, and often cannot be found around the location;

3. The timeliness is weak. Due to the second defect, many documents cannot be signed and sent back immediately.

Digital watermark technology is a direction in the field of anti-counterfeiting and information security technology. It is a content-based non-cryptographic mechanism information hiding technology. It embeds watermark information by slightly modifying the content of media data, so as to achieve the goal of information hiding. The embedded watermark can be detected by specialized technical software or instruments, and used as the basis for authentication, it is very suitable for digital countersignature.

The existing media watermarking technology has the following defects:

1. Processing speed. The more complex the watermarking algorithm is, the more watermarking data is added, and the slower the processing speed. If you use a professional instrument to add digital watermark, the cost is higher; if you use a general processor, the response time is longer, and it is difficult to satisfy users.

2. Portability and versatility. Most of the processing cores of specialized watermarking instruments are FPGA or ASIC, which have a single function and are not suitable for carrying around.

3. The type of watermark is single. Many existing digital watermarks are a group of passwords or a picture stored in memory.

4. Transmission tool. Many existing technologies use personal PCs to add watermarks, and then transmit them through wired broadband. Once they reach places where wired Internet access is inconvenient, they will be restricted.

5. The user base is small. Due to the existence of the above four defects, the scope of application of digital watermarking in daily commercial activities is currently limited, and it is more used in aspects such as intellectual property protection against piracy.

Contents of the invention

The purpose of the present invention is to provide an intelligent terminal, a receiving terminal and a method for countersigning by using the intelligent terminal, so as to enhance the portability and timeliness of countersigning.

In order to solve the above problems, the present invention provides a method for countersigning by using an intelligent terminal, including;

Receive the signature of the countersigner and add said signature to the document to be signed;

Making a digital watermark, adding the digital watermark to the file through a preset algorithm, and sending the file to a countersign recipient.

Further, the method further includes: collecting information required for making the digital watermark, the information including one or a combination of the following: password, signature handwriting, sound information, image information or a combination thereof.

Further, the sound information is the voice of the countersigner, and the image information is the appearance feature of the countersigner.

Further, before collecting the information required for making the digital watermark, the digital watermark security level selected by the countersigner is also received, and the information to be collected is determined according to the digital watermark security level.

Further, the method also includes:

After receiving the file, the countersign receiver extracts the digital watermark from the file, compares it with the locally pre-stored countersigner watermark information, and outputs a countersign result.

The present invention also provides an intelligent terminal, which includes;

The signature module is used to receive the signature of the countersigner, and add the signature to the document to be signed;

Watermark generation module, used for making digital watermark;

A watermark embedding module, configured to add the digital watermark to the file through a preset algorithm;

The file sending module is used to send the file to the recipient of the countersignature.

Further, the above-mentioned intelligent terminal may also have the following features, the intelligent terminal also includes: an information collection unit, configured to collect information required for making the digital watermark, the information includes one of the following or a combination thereof: password, signature handwriting , sound information, image information or a combination thereof.

Further, the above-mentioned smart terminal may also have the following features, the information collection unit includes one of audio input device, video input device, human-computer interaction device or a combination thereof.

Further, the above intelligent terminal may also have the following features, the voice information is the voice of the countersigner, and the image information is the appearance feature of the countersigner.

Further, the above-mentioned intelligent terminal may also have the following characteristics, the intelligent terminal also includes a security level selection unit, wherein:

The security level selection unit is configured to: receive the digital watermark security level selected by the countersigner;

The information collection unit is further configured to: determine the information to be collected according to the digital watermark security level.

The present invention also provides a digital watermark receiver, including:

The watermark extracting module is used to extract the digital watermark from the file after receiving the file of the countersigner;

The watermark storage module is used to store the watermark information of the countersigner;

a watermark comparison module, configured to compare the digital watermark extracted by the digital watermark extraction module with the countersigner watermark information stored in the watermark storage module, to obtain a countersign result;

The output device module is used to output the countersigning result.

The present invention has following effect:

The confidentiality of the countersign is high, and the highest level of digital watermark is the characteristic of personal information, which is difficult for others to counterfeit;

The processing speed is fast. The main frequency of the current smart terminal chip can reach 500MHZ or even higher, and the image processing also has a dedicated built-in hardware module, which greatly improves the speed of watermark generation and embedding, which can fully meet the user experience requirements;

Portability and versatility are strong, and the entire process of the countersigner only needs a smart terminal to complete;

Strong popularity, wide use of terminals, and increase in the market share of smart terminals can all apply this method;

There are many types of digital watermarks, providing digital watermarks with various levels, types, and embedded algorithms;

The transmission is simple, using a wireless network with a wider coverage, without relying on a wired network.

The present invention can be used for applications such as issuing encrypted files, personal authentication and the like.

Description of drawings

Fig. 1 is a system block diagram of the present invention;

Fig. 2 is an explanatory diagram of digital watermark generation according to an embodiment of the present invention;

Fig. 3 is an explanatory diagram of a digital watermarking algorithm related to the present invention;

Fig. 4 is the sending end watermark generation of the present invention, embedding processing flowchart;

Fig. 5 is a flow chart of validating and invalidating watermark at the receiving end in the present invention.

Detailed ways

The present invention provides a method for countersigning by using an intelligent terminal, including;

Receive the signature of the countersigner, add the signature to the document to be signed; make a digital watermark, add the digital watermark to the document through a preset algorithm, and send the document to the countersign recipient;

After receiving the file, the countersign receiver extracts the digital watermark from the file, compares it with the locally pre-stored countersigner watermark information, and outputs a countersign result.

Wherein, the document to be signed can be obtained locally, or sent to the countersigner by the other party who countersigns.

Wherein, the method further includes: collecting information required for making the digital watermark, and the information includes one or a combination of the following: password, signature handwriting, sound information, image information or a combination thereof.

Wherein, the sound information is the voice of the countersigner, and the image information is the appearance feature of the countersigner.

Wherein, before collecting the information required for making the digital watermark, the digital watermark security level selected by the countersigner is also received, and the information to be collected is determined according to the digital watermark security level. Of course, you can also choose not to make a digital watermark by collecting the default information directly according to the default setting.

The present invention provides an intelligent terminal, which includes;

The signature module is used to receive the signature of the countersigner, and add the signature to the document to be signed;

Watermark generation module, used for making digital watermark;

A watermark embedding module, configured to add the digital watermark to the file through a preset algorithm;

The file sending module is used to send the file to the recipient of the countersignature.

Wherein, the intelligent terminal further includes: an information collection unit, which is used to collect information required for making the digital watermark, and the information includes one or a combination of the following: one of passwords, signature handwriting, sound information, and image information or a combination thereof.

Wherein, the information collection unit includes one of an audio input device, a video input device, a human-computer interaction device or a combination thereof.

Wherein, the sound information is the voice of the countersigner, and the image information is the appearance feature of the countersigner. Of course, it may also be other sound or image information agreed upon by both parties.

Wherein, the intelligent terminal also includes a security level selection unit:

The security level selection unit is configured to: receive the digital watermark security level selected by the countersigner;

The information collection unit is further configured to: determine the information to be collected according to the digital watermark security level.

The present invention also provides a digital watermark receiver, including:

The watermark extracting module is used to extract the digital watermark from the file after receiving the file of the countersigner;

The watermark storage module is used to store the watermark information of the countersigner;

a watermark comparison module, configured to compare the digital watermark extracted by the digital watermark extraction module with the countersigner watermark information stored in the watermark storage module, to obtain a countersign result;

The output device module is used to output the countersigning result.

The present invention is further illustrated below by specific examples.

The present invention includes an intelligent terminal and a receiving end information processing device, wherein: the intelligent terminal includes:

(1) Intelligent terminal application processing chip;

(2) Video input devices, such as high-pixel terminal cameras;

(3) Human-computer interaction equipment, including touch screens, keyboards, etc.;

(4) audio input device, for example, a microphone;

Among them, the intelligent terminal application processing chip contains several modules: text input, processing module, image processing module (can provide clear pictures of signed documents, and can extract the appearance characteristics of the countersigner), audio processing module (can extract the voice characteristics of the countersigner) , watermark generation module, watermark embedding module.

The information processing device at the receiving end can be either a PC or a server, including the following modules: a watermark extraction module, a watermark storage module, a watermark comparison module, and an output device module.

The communication between the smart terminal and the receiving end device is carried out through the network, including but not limited to GPRS and 3G network. The specific implementation steps are as follows:

Step 101, the initiator of the countersign process sends the document to the countersigner;

The file may be sent by mail, or by other means, such as real-time transmission.

Step 102, the countersigner adds his signature to the document to be signed through text editing on the smart terminal;

Step 103, the countersigner selects the digital watermark security level for this transmission on the smart terminal;

The watermark security level can be three levels: high, medium and low. The low level is just to enter the password as authentication; the middle level uses signature and handwriting as authentication; the high level uses personal characteristics as authentication, such as facial shape, voice characteristics, etc. Of course, it can also be set according to needs More security levels, or setting a security level based on other information, for example, combining the above information to set a higher level of security level, which can be determined according to needs, which is not limited in the present invention.

Step 104, making a corresponding digital watermark according to the selected digital watermark security level;

Step 105, adding the digital watermark to the file to be returned through a certain algorithm, and sending the file back to the initiator of the countersigning process;

The file may be sent by mail, or by other means, such as real-time delivery.

Step 106, the initiator extracts and detects the digital watermark on the received receipt file, and compares it with the countersigner watermark information pre-stored in the device database. If the detection is successful, the authentication is successful. If the failure fails, choose whether to resend the receipt according to the situation. .

Of course, step 101 may not be performed, and the countersigner signs the local file, adds a watermark, and then sends it to the countersigner.

The implementation of the technical solution will be described in further detail below in conjunction with the accompanying drawings.

FIG. 1 is a system block diagram of the present invention, including an intelligent terminal 101 , a receiver information processing device 102 , a GPRS/3G air interface 103 and a wired network 104 .

The smart terminal 101 includes: a touch screen 105 for human-computer interaction, a keyboard 106 , a microphone 107 , a camera 108 , and a smart application processor suite 109 . Both the touch screen 105 and the keyboard 106 are touch-type input devices, and the keyboard 106 is not necessary on some full-touch smart terminals. The microphone 107 is used to collect sound information, and the camera 108 is used to collect image information. It is recommended to use a high-pixel camera, so that the collected images are clear and accurate, and easy to identify. The intelligent application processor suite 109 is the core of the intelligent terminal, which includes a text input and processing module, an audio processing module, an image processing module, a watermark generation module, a watermark embedding module and a file sending module.

The information processing device 102 at the receiving end may be a PC, or a server or a group of computers, etc., which can provide high-speed computing and large-capacity storage functions or a device group. The information processing device 102 at the receiving end needs to be connected to the network, which includes a watermark extraction module 110 , a watermark storage module 111 , a watermark comparison module 112 and an output device module 113 . The watermark extraction module 110 and the watermark embedding module in the intelligent application processor suite 109 provide reverse operations to extract the digital watermark. The watermark storage module 111 provides pre-stored countersigner information, such as handwriting, personal facial features, voice features or terminal numbers (a way of cryptographic watermarking) and the like. The watermark comparison module 112 compares the digital watermark extracted by the watermark extraction module 110 with the information in the watermark storage module 111, and judges whether the acquired digital watermark is valid. The final result of the judgment is notified to the originator of the countersigning process through the output device module 113. The output device module 113 has many forms, such as a display, a digital prompt tone or a short message notification.

GPRS/3G air interface 103, including but not limited to GPRS/EDGE/WCDMA/CDMA/WIFI, in short, includes all current 2G, 3G and future new communication standards.

The wired network 104 is not necessary, and the wired network 104 can be omitted if the information processing device at the receiving end can directly obtain information from the wireless air interface.

Fig. 2 is an illustration diagram illustrating generation of a digital watermark. When the digital watermark security level is selected as low, password watermark is the most common method, which will not be described in detail here; when the digital watermark security level is selected as medium, personal handwriting 201 can be selected to generate a digital watermark; when selected When the digital watermark security level is high, you can choose to use personal characteristics to generate digital watermarks. As shown in Figure 2, the user 203 speaks to the smart terminal 101, and the smart terminal 101 collects voice information, and generates a digital watermark 204 including the user's voice characteristics; Watermark 205.

Fig. 3 is an explanatory diagram illustrating an example of a digital watermarking algorithm. The generated digital watermark can be described as a set of signal streams. Write the byte length of the watermark signal into the reserved bytes of the header part of the image file to be protected, then convert the watermark signal into a binary data code stream, and write the upper 7 bits of each byte of the image data part of the image file to be protected The result of XORing with the above-mentioned binary data code stream is written into the lowest bit, and finally the image data added with the watermark signal is output. There are many applicable watermarking algorithms in the present invention, and there are quite a few related patents at home and abroad, which will not be described in detail here.

Fig. 4 is a flow chart of watermark generation and embedding processing at the sending end. First, the initiator of the countersigning process sends the document to be countersigned to the smart terminal of the countersigner through the network. After receiving the document, the countersigner uses the smart terminal to edit and countersign the document. After the signature is completed, it is necessary to choose the level of watermark encryption. When choosing a low level, use encryption methods such as passwords; when choosing a medium level, use personal handwriting and other methods; After the password input is completed, or the personal handwriting input is completed, or the personal feature collection is completed, the digital watermark is produced. After making the digital watermark, add the digital watermark to the file to be protected, and send the file back after the embedding is complete.

Fig. 5 is a flowchart of watermark verification at the receiving end of the present invention. After receiving the file, the information processing device at the receiving end in FIG. 1 uses the watermark extraction module 110 to extract the digital watermark, and then compares it with the countersigner watermark information provided in the watermark storage module 111 . For example, if a highly encrypted personal voice encryption method is adopted in this process, the pre-reserved voice information of the countersigner is provided in the database as a comparison. If the comparison results are consistent, the watermark is valid, the signature is successful, and this signature takes effect; if the comparison results are inconsistent, the watermark is invalid, and this countersignature is invalidated. Depending on the situation, it is necessary to notify the sender to retransmit.

Taking the flow of a countersignature as an example, the present invention will be described in detail:

A document needs to be signed, but the person with the authority to sign is on a business trip. At this time, the initiator of the countersignature process can send the document to the terminal of the countersigner. After the countersigner sees the document on the terminal, he can edit the picture or type on the keyboard on the terminal, and write his opinion of agreement or disagreement into the document. After completion, the terminal pops up an interface to allow the user to choose which level of watermark encryption to use. Specifically, it includes three levels: low, medium and high. Low-level watermarks are easy to set and fast in authentication, such as using passwords; medium-level watermarks are slightly more confidential, such as using touch screen signatures as watermarks; Personal characteristics, such as the profile of the person's face, the frequency domain characteristics of the voice when the person says "agree", etc., are difficult for others to imitate. The encrypted watermark should be the content previously determined and stored with the information processing equipment at the receiving end of the countersignature, such as the agreed password, the preserved handwriting, the outline of your face when you are bareheaded, or the frequency of your voice when you say the word "agree". domain characteristics, etc. After selecting the digital watermark security level, the next step is to generate a digital watermark. According to the different options above, the user uses the keyboard, touch screen, microphone or camera of the terminal to collect corresponding information to create a digital watermark. After the production is completed, the digital watermark is embedded into the file to be encrypted and sent back through the network. After receiving the file, the receiver device extracts the digital watermark by using an algorithm opposite to the embedded algorithm. The algorithm can be negotiated in advance, or when the terminal is encrypted, the encryption algorithm can be written into the file header, and the receiving end device can adapt after detection. The digital watermark is extracted and compared with the one stored in the watermark storage module. If the digital watermark is the same, the digital watermark is valid, and if it is not the same, it will be invalid. The result is displayed on the human-computer interaction interface, and the initiator of the countersigning process can choose whether the countersigner needs to resend it.

The present invention also provides a digital watermark receiver, including:

The watermark extracting module is used to extract the digital watermark from the file after receiving the file of the countersigner;

The watermark storage module is used to store the watermark information of the countersigner;

a watermark comparison module, configured to compare the digital watermark extracted by the digital watermark extraction module with the countersigner watermark information stored in the watermark storage module, to obtain a countersign result;

The output device module is used to output the countersigning result.

The present invention utilizes the powerful information processing capability of today's smart terminal chips to complete the function of transmitting digital watermarks, so as to achieve the purpose of enhancing the security of information transmission and anti-counterfeiting and anti-counterfeiting. For those people who are often on business trips, are not easy to find printers and scanners, but have a lot of things to sign, the intelligent terminal provided by the invention will become a good helper for their business office.

The invention can be used for applications such as encrypted transfer of signed and issued files, authorized reading, personal information authentication and the like.

Claims (11)

1. A method for countersigning by using an intelligent terminal, characterized in that it comprises: Receive the signature of the countersigner and add said signature to the document to be signed; Making a digital watermark, adding the digital watermark to the file through a preset algorithm, and sending the file to a countersign recipient. 2. The method according to claim 1, further comprising: collecting information required for making the digital watermark, the information including one of the following or a combination thereof: password, signature handwriting, sound information, One or a combination of image information. 3. The method according to claim 2, wherein the sound information is the voice of the countersigner, and the image information is the appearance feature of the countersigner. 4. The method according to claim 2 or 3, characterized in that before collecting the information required for making the digital watermark, the digital watermark security level selected by the countersigner is also received, and the required level is determined according to the digital watermark security level. collected information. 5. The method of claim 1, further comprising: After receiving the file, the countersign receiver extracts the digital watermark from the file, compares it with the locally pre-stored countersigner watermark information, and outputs a countersign result. 6. An intelligent terminal, characterized in that the intelligent terminal comprises; The signature module is used to receive the signature of the countersigner, and add the signature to the document to be signed; Watermark generation module, used for making digital watermark; A watermark embedding module, configured to add the digital watermark to the file through a preset algorithm; A file sending module, configured to send the file to the recipient of the countersignature. 7. The intelligent terminal according to claim 6, wherein the intelligent terminal further comprises: an information collection unit, configured to collect information required for making the digital watermark, and the information includes one of the following or a combination thereof: One or a combination of passwords, signatures, voice information, and image information. 8. The intelligent terminal according to claim 7, wherein the information collection unit comprises one of an audio input device, a video input device, a human-computer interaction device or a combination thereof. 9. The intelligent terminal according to claim 7, wherein the voice information is the voice of the countersigner, and the image information is the appearance feature of the countersigner. 10. The intelligent terminal according to claim 7, 8 or 9, wherein the intelligent terminal further comprises a security level selection unit, wherein: The security level selection unit is configured to: receive the digital watermark security level selected by the countersigner; The information collection unit is further configured to: determine the information to be collected according to the digital watermark security level. 11. A digital watermark receiver, characterized in that it comprises: The watermark extracting module is used to extract the digital watermark from the file after receiving the file of the countersigner; The watermark storage module is used to store the watermark information of the countersigner; a watermark comparison module, configured to compare the digital watermark extracted by the digital watermark extraction module with the countersigner watermark information stored in the watermark storage module, to obtain a countersign result; The output device module is used to output the countersigning result.

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