CN102118249B - Photographing and evidence-taking method based on digital digest and digital signature - Google Patents
Photographing and evidence-taking method based on digital digest and digital signature Download PDFInfo
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- CN102118249B CN102118249B CN201010605729.3A CN201010605729A CN102118249B CN 102118249 B CN102118249 B CN 102118249B CN 201010605729 A CN201010605729 A CN 201010605729A CN 102118249 B CN102118249 B CN 102118249B
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Abstract
The invention relates to the field of information security and in particular to a photographing and evidence-taking method based on a digital digest and a digital signature. The method adopts the technical scheme which comprises the following steps of: before photo information data are not stored, sending the digital digest of photo information to an evidence registration and preservation server of a third party; forming the digital signature through private key encryption by the evidence registration and preservation server of the third party so as to ensure photo authenticity; before photographing, sending time reference information by the evidence registration and preservation server of the third party; overlapping the photo information data with the time reference information data, calculating and generating the digital digest; and registering the receiving time when the evidence registration and preservation server of the third party receives the digital digest so as to ensure the photographing time authenticity. By adopting the technical scheme, when a photographing terminal photographs a photo, the photo is directly sent to the third party to prove the authenticity of the photo per se and the photographing time, therefore, the probative force of the photographed photo is greatly improved.
Description
Technical field
The present invention relates to information security field, relate in particular to a kind of evidence collecting method of taking pictures based on digital digest and digital signature.
Background technology
Along with the arrival of digital age, traditional film is withdrawn from the market substantially, and digital camera becomes main flow.At present, many mobile phones all configure digital camera functionality, mobile phone digital camera may be the maximum one of quantity in all digital cameras, it is widely used, for example, the self-service Claims Resolution of mobile phone photograph, just by most insurance company is adopted, carrys out Self-booster by the mode of mobile phone photograph and pays for, not only can reduce insurance company's cost, but also can facilitate car owner, be large newly measures really.But issuable risk also will be taken precautions against by insurance company, such as the authenticity that curstomer's site is surveyed, can or can not produce insurance fraud problem.Digital camera has many advantages, but many problems have also been brought simultaneously, wherein maximum problem is exactly the authenticity of photo, because making the authenticity of digital photograph, the extensive use of PS technology (photoshop) has a greatly reduced quality, the authenticity of the digital photograph showing in court has and can be under suspicion, meanwhile, the shooting time of photo plays vital effect to the facts confirmation of all kinds of disputes too.Aspect the digital photograph authenticity that existing technical scheme is taken at assurance camera, it is mostly direct embedded private key in digital camera, the digital digest of encrypting digital photograph by rivest, shamir, adelman forms digital signature, adopt this kind of technical scheme weak point to be: 1. because of the adjustable authenticity that cannot guarantee the photograph taking time of system time of photographing device, lack enough proofs; 2. may lose photo evidence because of the accidental damage of photographing device.
Summary of the invention
For the deficiency of prior art scheme, the present invention proposes a kind ofly when photographic intelligence data are not yet stored, just the digital digest of photographic intelligence to be sent to third party's evidence registration and preservation server, by third party's evidence registration and preservation server, with encrypted private key, form digital signature to guarantee photo authenticity, and take before by tripartite's evidence registration and preservation server transmitting time reference information, the data that photographic intelligence stacked data is added after time reference information are calculated generating digital summary, when receiving digital digest, third party's evidence registration and preservation server registers time of reception to guarantee the evidence collecting method of taking pictures of photograph taking time authenticity.Meanwhile, the graphic file of photo terminal can be uploaded to third party, saves from damage, with the fail safe of the evidence that guarantees to take pictures by third party storage.
The technical solution used in the present invention is as follows:
Based on the evidence collecting method of taking pictures of digital digest and digital signature, comprise step:
Step a, when photo terminal enters evidence obtaining exposal model, photo terminal sends request time calibration to third party's evidence registration and preservation server, after third party's evidence registration and preservation server response request, record standard temporal information is in central database, and sends standard time information to photo terminal;
Step b, photo terminal is taken pictures, and generate after original photo data, original photo data and the standard time information data of receiving are superposeed and compress synthetic image file C, by hash function algorithm, draw after the digital digest A of image file, digital digest A is sent to third party's evidence registration and preservation server;
Step c, third party's evidence registration and preservation server is stored in central database by the digital digest A receiving with the temporal information that completes reception, and digital digest A is sent to photo terminal with the encrypted private key generating digital signature B of signer;
Steps d, the digital digest A ' that photo terminal obtains the digital signature B receiving after the PKI deciphering of signer is with former digital digest A comparison, judge the two identical after, confirm that third party evidence registration and preservation server received digital digest A, last memory image file C and digital signature B.
Further, after described steps d, also comprise step:
Step e, photo terminal sends the request of preserving image file to third party's evidence registration and preservation server, after third party's evidence registration and preservation server response request, produce a symmetric cryptographic key P, symmetric cryptographic key P is formed to the symmetric cryptographic key P ' after encrypting after with the public key encryption of photo terminal, and be sent to photo terminal;
Step f, photo terminal receives and uses the symmetric cryptographic key P ' after its private key enabling decryption of encrypted, obtain symmetric cryptographic key P, then with sending the image file C ' encrypting after the symmetric cryptographic key P encrypted image file C obtaining to third party's evidence registration and preservation server;
Step g, third party's evidence registration and preservation server deposits the symmetric cryptographic key P ' after the public key encryption of photo terminal and the encrypted image file C ' that receives in central database in the lump.
Further, described step a also comprises step: photo terminal is not received standard time information within the predefined time, again to third party's evidence registration and preservation server, sends request time calibration.
Further, after execution of step c with before steps d, also comprise step: photo terminal is not received digital signature within the predefined time, again to third party's evidence registration and preservation server, send digital digest.
Further, described hash function algorithm is MD5 algorithm or SHA-1 algorithm or SHA-2 algorithm.
A kind of for realizing the camera arrangement of the above-mentioned evidence collecting method of taking pictures, at least comprise: camera lens, ccd image sensor, Image Data Compression processing module, central processing module, memory modules, outer storing module, data transmit-receive module, input module, display module, hash function algoritic module, described hash function algoritic module is connected to central processing module, be used for calculating generating digital summary, described memory modules has a read-only memory (ROM), for solidifying the main program of evidence obtaining exposal model, to prevent that it is tampered.
Further, described data transmit-receive module is a 3G mobile communication module.
The present invention adopts technique scheme, photo terminal when completing photograph taking, take a picture and directly transfer to third party to prove authenticity and the authenticity of photograph taking time of photo itself to have improved greatly the proof of taking pictures; And the graphic file of photo terminal can be uploaded to third party, by third party storage, save from damage, with the fail safe of the evidence that guarantees to take pictures.
Accompanying drawing explanation
Fig. 1 is the concrete steps schematic flow sheet of the embodiment of the present invention 1.
Embodiment
Now the present invention is further described with embodiment by reference to the accompanying drawings.
Embodiment 1:
Embodiments of the invention are purchased into by following steps:
Step a, when photo terminal enters evidence obtaining exposal model, photo terminal sends request time calibration to third party's evidence registration and preservation server, after third party's evidence registration and preservation server response request, record standard temporal information is in central database, and sends standard time information to photo terminal.
Step b, photo terminal is taken pictures, and generate after original photo data, original photo data and the standard time information data of receiving are superposeed and compress synthetic image file C, by hash function algorithm, draw after the digital digest A of image file, digital digest A is sent to third party's evidence registration and preservation server.
Step c, third party's evidence registration and preservation server is stored in central database by the digital digest A receiving with the temporal information that completes reception, and digital digest A is sent to photo terminal with the encrypted private key generating digital signature B of signer.
Steps d, the digital digest A ' that photo terminal obtains the digital signature B receiving after the PKI deciphering of signer is with former digital digest A comparison, judge the two identical after, confirm that third party evidence registration and preservation server received digital digest A, last memory image file C and digital signature B.
Concrete, consult the flow chart of steps shown in Fig. 1 and be photo terminal 1 and 2 points of other steps flow charts of third party's evidence registration and preservation server.Detailed step is as follows:
Described photo terminal 1 is one to have camera function and embedded for solidifying the mobile phone of read-only memory of the main program of taking pictures, and described third party's evidence registration and preservation server 2 is for possessing the data server of mechanism of corresponding legal proof power.
The steps flow chart of the photo terminal 1 of described mobile phone one end is: step 101: described mobile phone is introduced into evidence obtaining exposal model, step 102: then send request time calibration to proof side, step 103: there is no the time of receipt (T of R) information in the situation that, described mobile phone repeats to proof side's transmitting time calibration request, until receive standard time information, step 104 afterwards: stack original photo and standard time Information Compression form JPG image file, then step 105: described JPG image file is calculated to digital digest through hash function algorithm, step 106 afterwards: by cordless communication network to forward abstract, step 107: wait for and receive the digital signature that proof side sends, in the situation that not receiving digital signature, repetition sends digital digest to proof side, until receive digital signature, step 108 afterwards: memory image file and digital signature.
The steps flow chart of third party's evidence registration and preservation server 2 of described one end, proof side is: step 201: prove that side receives after request time calibration of one section of described mobile phone, step 202: transmission time information, step 203: and recording time information is in database, then step 204: wait for the digital digest information that receives, step 205: store digital digest information after receiving digital digest information, step 206: with the encrypted private key digital digest generating digital signature of the side of proof, step 207: then send digital signature to described mobile phone.
Embodiment 2:
The preferred embodiment of expansion of the present invention is purchased into by following steps:
Step a, when photo terminal enters evidence obtaining exposal model, photo terminal sends request time calibration to third party's evidence registration and preservation server, after third party's evidence registration and preservation server response request, record standard temporal information is in central database, and sends standard time information to photo terminal.
Photo terminal is not received standard time information within the predefined time, again to third party's evidence registration and preservation server, sends request time calibration, and concrete, the described predefined time is 1000ms.
Step b, photo terminal is taken pictures, and generate after original photo data, original photo data and the standard time information data of receiving are superposeed and compress synthetic image file C, by hash function algorithm, draw after the digital digest A of image file, digital digest A is sent to third party's evidence registration and preservation server.
Step c, third party's evidence registration and preservation server is stored in central database by the digital digest A receiving with the temporal information that completes reception, and digital digest A is sent to photo terminal with the encrypted private key generating digital signature B of signer.
Photo terminal is not received digital signature within the predefined time, again to third party's evidence registration and preservation server, sends digital digest, and concrete, the described predefined time is 1000ms.
Steps d, the digital digest A ' that photo terminal obtains the digital signature B receiving after the PKI deciphering of signer is with former digital digest A comparison, judge the two identical after, confirm that third party evidence registration and preservation server received digital digest A, last memory image file C and digital signature B.
Step e, photo terminal sends the request of preserving image file to third party's evidence registration and preservation server, after third party's evidence registration and preservation server response request, produce a symmetric cryptographic key P, symmetric cryptographic key P is formed to the symmetric cryptographic key P ' after encrypting after with the public key encryption of photo terminal, and be sent to photo terminal;
Step f, photo terminal receives and uses the symmetric cryptographic key P ' after its private key enabling decryption of encrypted, obtain symmetric cryptographic key P, then with sending the image file C ' encrypting after the symmetric cryptographic key P encrypted image file C obtaining to third party's evidence registration and preservation server;
Step g, third party's evidence registration and preservation server deposits the symmetric cryptographic key P ' after the public key encryption of photo terminal and the encrypted image file C ' that receives in central database in the lump.
Preferably, hash function algorithm as above is MD5 algorithm or SHA-1 algorithm or SHA-2 algorithm.
The present invention is also based on above-mentioned taking pictures evidence collecting method and propose a kind of special camera arrangement, it is by camera lens, ccd image sensor, Image Data Compression processing module, central processing module, memory modules, outer storing module, data transmit-receive module, input module, display module, hash function algoritic module forms (electrical connection of each module belongs to the common practise of this area, repeats no more).Wherein, hash function algoritic module is connected to central processing module, and for calculating generating digital summary, described memory modules has a read-only memory (ROM), for the main program that solidifies above-mentioned evidence obtaining exposal model, to prevent it, is tampered.
As one preferred embodiment: described data transmit-receive module is a 3G mobile communication module.
Although specifically show and introduced the present invention in conjunction with preferred embodiment; but those skilled in the art should be understood that; not departing from the spirit and scope of the present invention that appended claims limits; can make a variety of changes the present invention in the form and details, be protection scope of the present invention.
Claims (6)
1. the evidence collecting method of taking pictures based on digital digest and digital signature, comprises step:
Step a, when photo terminal enters evidence obtaining exposal model, photo terminal sends request time calibration to third party's evidence registration and preservation server, after third party's evidence registration and preservation server response request, record standard temporal information is in central database, and sends standard time information to photo terminal;
Step b, photo terminal is taken pictures, and generate after original photo data, original photo data and the standard time information data of receiving are superposeed and compress synthetic image file C, by hash function algorithm, draw after the digital digest A of image file, digital digest A is sent to third party's evidence registration and preservation server;
Step c, third party's evidence registration and preservation server is stored in central database by the digital digest A receiving with the temporal information that completes reception, and digital digest A is sent to photo terminal with the encrypted private key generating digital signature B of signer;
Steps d, the digital digest A ' that photo terminal obtains the digital signature B receiving after the PKI deciphering of signer is with former digital digest A comparison, judge the two identical after, confirm that third party evidence registration and preservation server received digital digest A, last memory image file C and digital signature B;
Step e, photo terminal sends the request of preserving image file to third party's evidence registration and preservation server, after third party's evidence registration and preservation server response request, produce a symmetric cryptographic key P, symmetric cryptographic key P is formed to the symmetric cryptographic key P ' after encrypting after with the public key encryption of photo terminal, and be sent to photo terminal;
Step f, photo terminal receives and uses the symmetric cryptographic key P ' after its private key enabling decryption of encrypted, obtain symmetric cryptographic key P, then with sending the image file C ' encrypting after the symmetric cryptographic key P encrypted image file C obtaining to third party's evidence registration and preservation server;
Step g, third party's evidence registration and preservation server deposits the symmetric cryptographic key P ' after the public key encryption of photo terminal and the encrypted image file C ' that receives in central database in the lump.
2. the evidence collecting method of taking pictures based on digital digest and digital signature as claimed in claim 1, it is characterized in that: described step a also comprises step: photo terminal is not received standard time information within the predefined time, again to third party's evidence registration and preservation server, send request time calibration.
3. the evidence collecting method of taking pictures based on digital digest and digital signature as claimed in claim 1, it is characterized in that: after execution of step c with before steps d, also comprise step: photo terminal is not received digital signature within the predefined time, again to third party's evidence registration and preservation server, send digital digest.
4. the evidence collecting method of taking pictures based on digital digest and digital signature as claimed in claim 1, is characterized in that: described hash function algorithm is MD5 algorithm or SHA-1 algorithm or SHA-2 algorithm.
5. one kind for realizing the camera arrangement of the arbitrary described evidence collecting method of taking pictures of as above claim 1-4, at least comprise: camera lens, ccd image sensor, Image Data Compression processing module, central processing module, memory modules, outer storing module, data transmit-receive module, input module, display module, it is characterized in that: also comprise a hash function algoritic module, it is connected to central processing module, be used for calculating generating digital summary, described memory modules has a read-only memory, for solidifying the main program of evidence obtaining exposal model.
6. camera arrangement as claimed in claim 5, is characterized in that: described data transmit-receive module is a 3G mobile communication module.
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| CN102902934B (en) * | 2011-09-27 | 2016-10-05 | 微软技术许可有限责任公司 | Main frame is unknowable integrated and inter-operation system |
| US20130080603A1 (en) | 2011-09-27 | 2013-03-28 | Microsoft Corporation | Fault Tolerant External Application Server |
| CN103475664B (en) * | 2013-09-18 | 2017-02-15 | 北京工业大学 | Credible extraction method for digital evidence of Android |
| CN104680074A (en) * | 2013-11-27 | 2015-06-03 | 中国科学院深圳先进技术研究院 | Mobile terminal image encryption method and device |
| CN105138588B (en) * | 2015-07-31 | 2018-09-28 | 南开大学 | A kind of database overlap scheme abstraction generating method propagated based on multi-tag |
| CN105187516A (en) * | 2015-08-19 | 2015-12-23 | 郑州悉知信息科技股份有限公司 | Data processing method and apparatus |
| CN105354773B (en) * | 2015-10-28 | 2020-05-12 | 重庆邮电大学 | System for evidence preservation and verification on traffic accident scene |
| CN105471996B (en) * | 2015-12-03 | 2019-01-18 | 福建天晴数码有限公司 | A kind of method and system of uploading pictures |
| CN106452791B (en) * | 2016-11-11 | 2020-01-31 | 浙江神州量子网络科技有限公司 | quantum digital signature method without trust center |
| CN108282338A (en) * | 2017-12-25 | 2018-07-13 | 河北腾翔科技有限公司 | The autonomous signature system of camera and endorsement method of intelligent terminal |
| CN109743496A (en) * | 2018-12-19 | 2019-05-10 | 孙健鹏 | A kind of method and device of image procossing |
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