CN102118249A - 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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- CN102118249A CN102118249A CN2010106057293A CN201010605729A CN102118249A CN 102118249 A CN102118249 A CN 102118249A CN 2010106057293 A CN2010106057293 A CN 2010106057293A CN 201010605729 A CN201010605729 A CN 201010605729A CN 102118249 A CN102118249 A CN 102118249A
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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Along with the arrival of digital age, traditional film is withdrawn from the market substantially, and digital camera becomes main flow.At present, many mobile phones all dispose digital camera functionality, the mobile phone digital camera may be maximum a kind of of quantity in all digital cameras, it is widely used, for example, the self-service Claims Resolution of mobile phone photograph is just adopted by most insurance company, comes Self-booster to pay for the mode of mobile phone photograph, not only can reduce insurance company's cost, but also can make things convenient for the car owner, be big newly measures really.But issuable risk also will be taken precautions against by insurance company, and the authenticity such as curstomer`s site is surveyed can or can not produce the insurance fraud problem.Digital camera has many advantages, but many problems have also been brought simultaneously, wherein Zui Da problem is exactly the authenticity of photo, because of the extensive use of PS technology (photoshop) makes the authenticity of digital photograph have a greatly reduced quality, the authenticity of the digital photograph that shows in court has and can be under suspicion, simultaneously, the shooting time of photo plays crucial effects to the facts confirmation of all kinds of disputes too.Existing technical scheme is aspect the digital photograph authenticity that guarantees the camera shooting, it mostly is direct embedded private key in digital camera, the digital digest of encrypting digital photograph by rivest, shamir, adelman forms digital signature, adopt this kind technical scheme weak point to be: 1. because of the adjustable authenticity that can't guarantee the photograph taking time of the system time of photographing device, lack enough proofs; 2. may lose the photo evidence because of the accidental damage of photographing device.
Summary of the invention
Deficiency at the prior art scheme, the present invention proposes a kind ofly just the digital digest of photographic intelligence not to be sent to third party's evidence registration and preservation server when the photographic intelligence data are stored as yet, form digital signature to guarantee the photo authenticity by third party's evidence registration and preservation server with encrypted private key, and before taking by tripartite evidence registration and preservation server transmitting time reference information, the data computation that the photographic intelligence stacked data is added behind the time reference information generates digital digest, and the registration time of reception is to guarantee the evidence collecting method of taking pictures of photograph taking time authenticity when third party's evidence registration and preservation server is received digital digest.Simultaneously, the graphic file of photo terminal can be uploaded to the third party, saves from damage by third party storage, with the fail safe of the evidence that guarantees to take pictures.
The technical solution used in the present invention is as follows:
A kind of evidence collecting method of taking pictures based on digital digest and digital signature comprises step:
Step a, when photo terminal entered the evidence obtaining exposal model, photo terminal sent request time calibration to third party's evidence registration and preservation server, after third party's evidence registration and preservation server response request, the record standard temporal information is in central database, and transmission standard time information is to photo terminal;
Step b, photo terminal is taken pictures, and after generating the original photo data, original photo data and the standard time information data stack and the compression of receiving are generated image file C, draw the digital digest A of image file by the hash function algorithm after, 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 with the digital digest A that receives and the temporal information of finishing reception, and digital digest A is generated digital signature B with the encrypted private key of signer is sent to photo terminal;
Steps d, photo terminal is compared the digital digest A ' that the digital signature B that receives obtains after the PKI deciphering of signer with former digital digest A, judge the two identical after, confirm that third party's 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, produce a symmetric cryptographic key P after third party's evidence registration and preservation server response request, symmetric cryptographic key P ' after symmetric cryptographic key P form encrypted after with the public key encryption of photo terminal, and be sent to photo terminal;
Step f, photo terminal receives and with the symmetric cryptographic key P ' behind its private key enabling decryption of encrypted, obtain symmetric cryptographic key P, again with sending the image file C ' of encryption behind the symmetric cryptographic key P encrypted image file C that obtains to third party's evidence registration and preservation server;
Step g, third party's evidence registration and preservation server after with the public key encryption of photo terminal symmetric cryptographic key P ' and the encrypted image file C ' that receives deposit central database in the lump in.
Further, described step a also comprises step: photo terminal is not received standard time information in the predefined time, then sends request time calibration to third party's evidence registration and preservation server again.
Further, also comprise step after execution of step c with before the steps d: photo terminal is not received digital signature in the predefined time, then sends digital digest to third party's evidence registration and preservation server again.
Further, described hash function algorithm is MD5 algorithm or SHA-1 algorithm or SHA-2 algorithm.
A kind of camera arrangement that is used to realize 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 the generation digital digest, described memory modules has a read-only memory (ROM), be used to solidify the main program of evidence obtaining exposal model, to prevent that it from being distorted.
Further, described data transmit-receive module is a 3G mobile communication module.
The present invention adopts technique scheme, photo terminal when finishing photograph taking, take a picture and promptly directly transfer to authenticity and the authenticity of photograph taking time that the third party proves photo itself, improved the proof of taking pictures greatly; And the graphic file of photo terminal can be uploaded to the third party, saves from damage by third party storage, with the fail safe of the evidence that guarantees to take pictures.
Description of drawings
Fig. 1 is the concrete steps schematic flow sheet of the embodiment of the invention 1.
Embodiment
Now the present invention is further described with embodiment in conjunction with the accompanying drawings.
Embodiment 1:
Embodiments of the invention are purchased by following steps:
Step a, when photo terminal entered the evidence obtaining exposal model, photo terminal sent request time calibration to third party's evidence registration and preservation server, after third party's evidence registration and preservation server response request, the record standard temporal information is in central database, and transmission standard time information is to photo terminal.
Step b, photo terminal is taken pictures, and after generating the original photo data, original photo data and the standard time information data stack and the compression of receiving are generated image file C, draw the digital digest A of image file by the hash function algorithm after, 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 with the digital digest A that receives and the temporal information of finishing reception, and digital digest A is generated digital signature B with the encrypted private key of signer is sent to photo terminal.
Steps d, photo terminal is compared the digital digest A ' that the digital signature B that receives obtains after the PKI deciphering of signer with former digital digest A, judge the two identical after, confirm that third party's evidence registration and preservation server received digital digest A, last memory image file C and digital signature B.
Concrete, consult flow chart of steps shown in Figure 1 and be photo terminal 1 and 2 fens 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 and be used to solidify the mobile phone of read-only memory of main program of taking pictures, and described third party's evidence registration and preservation server 2 is the data server of the mechanism that possesses 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 the evidence obtaining exposal model, step 102: send request time calibration to proof side then, step 103: under the situation that does not have time of receipt (T of R) information, described mobile phone repeats to proof side's transmitting time calibration request, up to receiving standard time information, step 104 afterwards: stack original photo and standard time Information Compression form the JPG image file, step 105 then: described JPG image file is gone out digital digest through the hash function algorithm computation, step 106 afterwards: by cordless communication network to forward abstract, step 107: wait for receiving the digital signature that proof side sends, under the situation of not receiving digital signature, repetition sends digital digest to proof side, up to receiving 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 proof Fang Yiduan is: step 201: after proving that the side receives 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: after receiving digital digest information, store digital digest information, step 206: the encrypted private key digital digest with the side of proof generates digital signature, step 207: send digital signature then to described mobile phone.
Embodiment 2:
The preferred embodiment of expansion of the present invention is purchased by following steps:
Step a, when photo terminal entered the evidence obtaining exposal model, photo terminal sent request time calibration to third party's evidence registration and preservation server, after third party's evidence registration and preservation server response request, the record standard temporal information is in central database, and transmission standard time information is to photo terminal.
Photo terminal is not received standard time information in the predefined time, then send request time calibration to third party's evidence registration and preservation server again, and concrete, the described predefined time is 1000ms.
Step b, photo terminal is taken pictures, and after generating the original photo data, original photo data and the standard time information data stack and the compression of receiving are generated image file C, draw the digital digest A of image file by the hash function algorithm after, 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 with the digital digest A that receives and the temporal information of finishing reception, and digital digest A is generated digital signature B with the encrypted private key of signer is sent to photo terminal.
Photo terminal is not received digital signature in the predefined time, then send digital digest to third party's evidence registration and preservation server again, and concrete, the described predefined time is 1000ms.
Steps d, photo terminal is compared the digital digest A ' that the digital signature B that receives obtains after the PKI deciphering of signer with former digital digest A, judge the two identical after, confirm that third party's 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, produce a symmetric cryptographic key P after third party's evidence registration and preservation server response request, symmetric cryptographic key P ' after symmetric cryptographic key P form encrypted after with the public key encryption of photo terminal, and be sent to photo terminal;
Step f, photo terminal receives and with the symmetric cryptographic key P ' behind its private key enabling decryption of encrypted, obtain symmetric cryptographic key P, again with sending the image file C ' of encryption behind the symmetric cryptographic key P encrypted image file C that obtains to third party's evidence registration and preservation server;
Step g, third party's evidence registration and preservation server after with the public key encryption of photo terminal symmetric cryptographic key P ' and the encrypted image file C ' that receives deposit central database in the lump in.
Preferably, aforesaid hash function algorithm is MD5 algorithm or SHA-1 algorithm or SHA-2 algorithm.
The present invention also takes pictures evidence collecting method and proposes a kind of camera arrangement of special use based on above-mentioned, 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, the hash function algoritic module constitutes (electrical connection of each module belongs to the common practise of this area, repeats no more).Wherein, the hash function algoritic module is connected to central processing module, is used for calculating generating digital digest, and described memory modules has a read-only memory (ROM), is used to solidify the main program of above-mentioned evidence obtaining exposal model to prevent that it from being distorted.
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 the those skilled in the art should be understood that; in the spirit and scope of the present invention that do not break away from appended claims and limited; can make various variations to the present invention in the form and details, be protection scope of the present invention.
Claims (7)
1. evidence collecting method of taking pictures based on digital digest and digital signature comprises step:
Step a, when photo terminal entered the evidence obtaining exposal model, photo terminal sent request time calibration to third party's evidence registration and preservation server, after third party's evidence registration and preservation server response request, the record standard temporal information is in central database, and transmission standard time information is to photo terminal;
Step b, photo terminal is taken pictures, and after generating the original photo data, original photo data and the standard time information data stack and the compression of receiving are generated image file C, draw the digital digest A of image file by the hash function algorithm after, 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 with the digital digest A that receives and the temporal information of finishing reception, and digital digest A is generated digital signature B with the encrypted private key of signer is sent to photo terminal;
Steps d, photo terminal is compared the digital digest A ' that the digital signature B that receives obtains after the PKI deciphering of signer with former digital digest A, judge the two identical after, confirm that third party's evidence registration and preservation server received digital digest A, last memory image file C and digital signature B.
2. the evidence collecting method of taking pictures based on digital digest and digital signature as claimed in claim 1 is characterized in that: also comprise step after described steps d:
Step e, photo terminal sends the request of preserving image file to third party's evidence registration and preservation server, produce a symmetric cryptographic key P after third party's evidence registration and preservation server response request, symmetric cryptographic key P ' after symmetric cryptographic key P form encrypted after with the public key encryption of photo terminal, and be sent to photo terminal;
Step f, photo terminal receives and with the symmetric cryptographic key P ' behind its private key enabling decryption of encrypted, obtain symmetric cryptographic key P, again with sending the image file C ' of encryption behind the symmetric cryptographic key P encrypted image file C that obtains to third party's evidence registration and preservation server;
Step g, third party's evidence registration and preservation server after with the public key encryption of photo terminal symmetric cryptographic key P ' and the encrypted image file C ' that receives deposit central database in the lump in.
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: described step a also comprises step: photo terminal is not received standard time information in the predefined time, then sends request time calibration to third party's evidence registration and preservation server again.
4. the evidence collecting method of taking pictures based on digital digest and digital signature as claimed in claim 1, it is characterized in that: also comprise step after execution of step c with before the steps d: photo terminal is not received digital signature in the predefined time, then sends digital digest to third party's evidence registration and preservation server again.
5. 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.
6. one kind is used to realize the as above camera arrangement of the described evidence collecting method of taking pictures of claim 1-5, 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 the generation digital digest, described memory modules has a read-only memory, is used to solidify the main program of evidence obtaining exposal model.
7. camera arrangement as claimed in claim 6 is characterized in that: described data transmit-receive module is a 3G mobile communication module.
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| CN103475664A (en) * | 2013-09-18 | 2013-12-25 | 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 |
| CN105138588A (en) * | 2015-07-31 | 2015-12-09 | 南开大学 | Database overlap mode abstract generating method based on multi-label propagation |
| 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 |
| CN105354773A (en) * | 2015-10-28 | 2016-02-24 | 重庆邮电大学 | System for evidence preservation and verification of traffic accident scene |
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| CN106452791A (en) * | 2016-11-11 | 2017-02-22 | 浙江神州量子网络科技有限公司 | Quantum digital signature method for untrusted 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 |
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Denomination of invention: Photographing and evidence-taking method based on digital digest and digital signature Effective date of registration: 20150831 Granted publication date: 20140430 Pledgee: China Co truction Bank Corp Xiamen branch Pledgor: Xiamen Best Information Technology Co.,Ltd. Registration number: 2015350000066 |
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Denomination of invention: Photographing and evidence-taking method based on digital digest and digital signature Effective date of registration: 20160831 Granted publication date: 20140430 Pledgee: China Co truction Bank Corp Xiamen branch Pledgor: Xiamen Best Information Technology Co.,Ltd. Registration number: 2016350000090 |
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Denomination of invention: A photo forensics method based on digital digest and digital signature Effective date of registration: 20200903 Granted publication date: 20140430 Pledgee: China Co. truction Bank Corp Xiamen branch Pledgor: XIAMEN BEST INFORMATION TECHNOLOGY Co.,Ltd. Registration number: Y2020990001067 |
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Date of cancellation: 20210907 Granted publication date: 20140430 Pledgee: China Co. truction Bank Corp Xiamen branch Pledgor: XIAMEN BEST INFORMATION TECHNOLOGY Co.,Ltd. Registration number: Y2020990001067 |
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Denomination of invention: A photographic forensics method based on digital digest and digital signature Effective date of registration: 20210907 Granted publication date: 20140430 Pledgee: China Co. truction Bank Corp Xiamen branch Pledgor: XIAMEN BEST INFORMATION TECHNOLOGY Co.,Ltd. Registration number: Y2021990000809 |