CN104517059A - Cloud-based image encryption method and device - Google Patents

Abstract

The invention provides a cloud-based image encryption method and device, and relates to the technical field of data encryption. The method includes the steps: compressing image data and dividing the image data into first data and second data in the compressing process; storing the first data to a local terminal device; uploading the second data to a cloud server to store the second data by the cloud server. The method can solve the problems that encryption time of the current image encryption technology is long and private images are leaked as the current image encryption technology is easily cracked.

Description

Based on image encryption method and the device of cloud

Technical field

The present invention relates to data encryption technology field, particularly relate to a kind of image encryption method based on cloud and device.

Background technology

At present, along with the terminal devices such as the smart mobile phone with camera function are day by day universal, the secret protection technology of personal images also develops gradually.Current, a lot of personal images is all kept at the terminals such as mobile phone, or is directly kept on cloud server.And when the lost terminal such as mobile phone, or the terminal such as mobile phone and cloud server all may be caused the privacy leakage of personal images by assault.Therefore, digital image encryption technology is adopted to be encrypted keeping to personal images day by day universal.

But the data volume of current digital picture is large, and redundance is high, adopts existing file ciphering technology comparatively consuming time, and is easily subject to the instrument of various cryptanalytic methods, and the secret protection of personal images receives serious threat.

Summary of the invention

Embodiments of the invention provide a kind of image encryption method based on cloud and device, comparatively consuming time with the encryption solving current image encryption technology, and are easily cracked, and cause the problem of the privacy leakage of personal images.

For achieving the above object, the present invention adopts following technical scheme:

Based on an image encryption method for cloud, comprising:

View data is compressed, and in compression process, is split as Part I data and Part II data;

Described Part I data are stored in terminal device this locality;

By described Part II data upload to Cloud Server, preserve described Part II data to make described Cloud Server.

Further, the described image encryption method based on cloud, also comprises:

The Part I data of a view data are obtained from described terminal device this locality;

The Part II data of described view data are obtained from described Cloud Server;

Described Part I data and described Part II data are reduced, acquires described view data.

Concrete, described view data to be compressed, and in compression process, be split as Part I data and Part II data, comprising:

Described view data being carried out jpeg format compression, obtaining DC converting coefficient and exchange conversion coefficient when carrying out the step of discrete cosine transform; Described Part I data comprise described exchange conversion coefficient; Described Part II data comprise described DC converting coefficient.

Concrete, described view data to be compressed, and in compression process, be split as Part I data and Part II data, comprising:

Described view data being carried out JPEG2000 format compression, obtaining the lowest frequency signal that wavelet transformation produces when carrying out the step of wavelet transformation; Described Part I data comprise other signals except described lowest frequency signal that wavelet transformation produces; Described Part II data comprise described lowest frequency signal.

Based on an image encrypting apparatus for cloud, comprising:

View data split cells, for view data being compressed, and is split as Part I data and Part II data in compression process;

Local storage unit, for being stored in terminal device this locality by described Part I data;

Data upload unit, for by described Part II data upload to Cloud Server, preserve described Part II data to make described Cloud Server.

In addition, based on the image encrypting apparatus of cloud, also should comprise:

Part I data capture unit, for obtaining the Part I data of a view data from described terminal device this locality;

Part II data capture unit, for obtaining the Part II data of described view data from described Cloud Server;

View data reduction unit, for described Part I data and described Part II data being reduced, acquires described view data.

In addition, described by view data split cells, specifically for:

Described view data being carried out jpeg format compression, obtaining DC converting coefficient and exchange conversion coefficient when carrying out the step of discrete cosine transform; Described Part I data comprise described exchange conversion coefficient; Described Part II data comprise described DC converting coefficient.

In addition, described view data split cells, specifically for:

Described view data being carried out JPEG2000 format compression, obtaining the lowest frequency signal that wavelet transformation produces when carrying out the step of wavelet transformation; Described Part I data comprise other signals except described lowest frequency signal that wavelet transformation produces; Described Part II data comprise described lowest frequency signal.

The image encryption method based on cloud that the embodiment of the present invention provides and device, by view data being compressed, and be split as Part I data and Part II data in compression process, and be stored in terminal device this locality and Cloud Server respectively.Thus at terminal device by assault or stolen, or after Cloud Server is by assault, complete view data can not be obtained, the encryption technology avoiding current view data is comparatively loaded down with trivial details, and is easily cracked and causes the problem of privacy leakage.And a part of data upload only split out by image is in Cloud Server, without the need to carrying out digital encryption to whole view data, comparatively saves encryption times.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

The process flow diagram one of the image encryption method based on cloud that Fig. 1 provides for the embodiment of the present invention;

The flowchart 2 of the image encryption method based on cloud that Fig. 2 provides for the embodiment of the present invention;

The structural representation one of the image encrypting apparatus based on cloud that Fig. 3 provides for the embodiment of the present invention;

The structural representation two of the image encrypting apparatus based on cloud that Fig. 4 provides for the embodiment of the present invention.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.

The embodiment of the present invention provides a kind of image encryption method based on cloud, as shown in Figure 1, comprising:

Step 101, view data to be compressed, and in compression process, be split as Part I data and Part II data.

Step 102, these Part I data are stored in terminal device this locality.

Step 103, by this Part II data upload to Cloud Server, preserve Part II data to make Cloud Server.

What deserves to be explained is, this terminal device can be mobile phone terminal, panel computer, notebook computer etc., but is not only confined to this.

The image encryption method based on cloud that the embodiment of the present invention provides, by view data being compressed, and is split as Part I data and Part II data in compression process, and is stored in terminal device this locality and Cloud Server respectively.Thus at terminal device by assault or stolen, or after Cloud Server is by assault, complete view data can not be obtained, the encryption technology avoiding current view data is comparatively loaded down with trivial details, and is easily cracked and causes the problem of privacy leakage.And a part of data upload only split out by image is in Cloud Server, without the need to carrying out digital encryption to whole view data, comparatively saves encryption times.

What deserves to be explained is, the processing mode of image being carried out to lossy compression method can by being mapped to the conversion transform domain from spatial domain by image, carry out succinct effective process in the transform domain as illustrated, be mapped to by the aerial image primitive matrix of strong correlation and do not want that close, that energy distribution is compact conversion coefficient battle array completely, conventional transform method comprises discrete cosine transform, wavelet transformation etc.

When adopting discrete cosine transform, view data is compressed in above-mentioned step 101, and in compression process, be split as Part I data and Part II data, can realize in the following way:

Described view data being carried out jpeg format compression, obtaining DC converting coefficient and exchange conversion coefficient when carrying out the step of discrete cosine transform; Described Part I data comprise described exchange conversion coefficient; Described Part II data comprise described DC converting coefficient.

Or when adopting wavelet transformation, view data is compressed in above-mentioned step 101, and in compression process, be split as Part I data and Part II data, can realize in the following way:

Described view data being carried out JPEG2000 format compression, obtaining the lowest frequency signal that wavelet transformation produces when carrying out the step of wavelet transformation; Described Part I data comprise other signals except described lowest frequency signal that wavelet transformation produces; Described Part II data comprise described lowest frequency signal.

What deserves to be explained is, these Part II data are DC converting coefficient or are lowest frequency signal, and its data volume is less, and therefore when carrying out uploading to Cloud Server, shared time compole is short.

Enumerate a more specifically embodiment below, to make those skilled in the art better understand the present invention, as shown in Figure 2, the embodiment of the present invention provides a kind of image encryption method based on cloud, comprising:

Step 201, view data to be compressed, and in compression process, be split as Part I data and Part II data.

What deserves to be explained is, the processing mode of image being carried out to lossy compression method can by being mapped to the conversion transform domain from spatial domain by image, carry out succinct effective process in the transform domain as illustrated, be mapped to by the aerial image primitive matrix of strong correlation and do not want that close, that energy distribution is compact conversion coefficient battle array completely, conventional transform method comprises discrete cosine transform, wavelet transformation etc.

When adopting discrete cosine transform, view data is compressed in above-mentioned step 201, and in compression process, be split as Part I data and Part II data, can realize in the following way:

Described view data being carried out jpeg format compression, obtaining DC converting coefficient and exchange conversion coefficient when carrying out the step of discrete cosine transform; Described Part I data comprise described exchange conversion coefficient; Described Part II data comprise described DC converting coefficient.

Or when adopting wavelet transformation, view data is compressed in above-mentioned step 201, and in compression process, be split as Part I data and Part II data, can realize in the following way:

Described view data being carried out JPEG2000 format compression, obtaining the lowest frequency signal that wavelet transformation produces when carrying out the step of wavelet transformation; Described Part I data comprise other signals except described lowest frequency signal that wavelet transformation produces; Described Part II data comprise described lowest frequency signal.

Step 202, these Part I data are stored in terminal device this locality.

Step 203, by this Part II data upload to Cloud Server, preserve Part II data to make Cloud Server.

Step 204, obtain the Part I data of a view data from terminal device this locality.

Step 205, obtain the Part II data of view data from Cloud Server.

Step 206, Part I data and Part II data to be reduced, acquire view data.

Herein, only have the Part II data of the Part I data and Cloud Server simultaneously obtaining terminal device this locality just may restore original view data, independent mobile phone is lost or Cloud Server is attacked the problem being all not enough to cause image to reveal, and improves the security that view data stores.

Be described for current modal jpeg file compression algorithm below, general JPEG Coding Compression Algorithm one is divided into 11 steps: the Differential pulse code modulation coding of the conversion of (1) color mode, (2) sampling, (3) piecemeal, (4) discrete cosine transform, (5) Zigzag scan sorting, (6) quantification, (7) DC coefficient, the intermediate form of (8) DC coefficient calculate, the run length coding, RLC of (9) AC coefficient, the intermediate form of (10) AC coefficient calculate, (11) entropy code.Wherein, this discrete cosine transform (i.e. DCT cosine transform) generally adopts following formula to convert:

$f(u,v)=\frac{2}{N}\underset{x=0}{\overset{7}{\mathrm{\Σ}}}\underset{y=0}{\overset{7}{\mathrm{\Σ}}}C\left(u\right)C\left(v\right)F(u,v)\cos \left[\frac{(2x+1)\mathrm{u\π}}{2N}\right]\cos \left[\frac{(2y+1)\mathrm{v\π}}{2N}\right]$

$C\left(\mathrm{\ω}\right)=\frac{1}{\sqrt{2}},$ When ω=0

C (ω)=1, when ω=1,2 ..., 7

The process that image file after preservation becomes compression after carrying out further data compression and coding to the matrix preserving F (x, y) decompresses to image file is then just in time contrary, and the formula of DCT inverse transformation is as follows:

$F(u,v)=\frac{2}{N}C\left(u\right)C\left(v\right)\underset{x=0}{\overset{7}{\mathrm{\Σ}}}\underset{y=0}{\overset{7}{\mathrm{\Σ}}}f(x,y)\cos \left[\frac{(2x+1)\mathrm{u\π}}{2N}\right]\cos \left[\frac{(2y+1)\mathrm{v\π}}{2N}\right]$

In above-mentioned formula, the data message that F (u, v) is image block, is generally the round values between-128 to 127, f (u, v) is the conversion coefficient after dct transform, and N is the number of lines of pixels of image, be generally the transverse and longitudinal coordinate that 8, u and v is pixel, be generally between 0-7.

In above-mentioned steps 201-203, by DC converting coefficient f (0 after being DCT cosine transform, 0) Cloud Server is uploaded to, and other exchange conversion coefficient is kept at this locality, carry out pooled data with exchange conversion coefficient after the DC converting coefficient of Cloud Server being downloaded to this locality in the process of above-mentioned step 204-206, thus carry out image restoring.

In addition, for the JPEG2000 Standard of image compression adopting wavelet transformation, lowest frequency signal is uploaded to Cloud Server after can adopting compression and preserves by above-mentioned steps 201-203, and other other low frequencies except this lowest frequency signal or high-frequency signal are kept at this locality, in step 204-206, first can download the lowest frequency signal of image from Cloud Server when decompress(ion), then by this lowest frequency signal and other signals being stored in this locality, also original digital image data, JPEG2000 Standard of image compression, can see JPEG2000 compression of images international standard (ISO/IEC 15444-1 ~ 12, ITU T.800 ~ 808), repeat no more herein.

The image encryption method based on cloud that the embodiment of the present invention provides, by view data being compressed, and is split as Part I data and Part II data in compression process, and is stored in terminal device this locality and Cloud Server respectively.Thus at terminal device by assault or stolen, or after Cloud Server is by assault, complete view data can not be obtained, the encryption technology avoiding current view data is comparatively loaded down with trivial details, and is easily cracked and causes the problem of privacy leakage.And a part of data upload only split out by image is in Cloud Server, without the need to carrying out digital encryption to whole view data, comparatively saves encryption times.

Corresponding to above-mentioned embodiment of the method, the embodiment of the present invention also provides a kind of image encrypting apparatus based on cloud, as shown in Figure 3, comprising:

View data split cells 31, can compress view data, and in compression process, be split as Part I data and Part II data.

Part I data can be stored in terminal device this locality by local storage unit 32.

Data upload unit 33, by Part II data upload to Cloud Server, can preserve Part II data to make Cloud Server.

Further, as shown in Figure 4, based on the image encrypting apparatus of cloud, can also should comprise:

Part I data capture unit 34, can obtain the Part I data of a view data from terminal device this locality;

Part II data capture unit 35, can obtain the Part II data of view data from Cloud Server;

Part I data and Part II data can be reduced, be acquired view data by view data reduction unit 36.

In addition, by view data split cells 31, specifically described view data jpeg format compression be can being carried out, DC converting coefficient and exchange conversion coefficient obtained when carrying out the step of discrete cosine transform; Part I data comprise exchange conversion coefficient; Part II data comprise DC converting coefficient.Or described view data can being carried out JPEG2000 format compression, obtaining the lowest frequency signal that wavelet transformation produces when carrying out the step of wavelet transformation; Part I data comprise other signals except lowest frequency signal that wavelet transformation produces; Part II data comprise lowest frequency signal.

The specific implementation of the image encrypting apparatus based on cloud that the embodiment of the present invention provides see the embodiment of the method for above-mentioned Fig. 1 and Fig. 2, can repeat no more herein.

The image encrypting apparatus based on cloud that the embodiment of the present invention provides, by view data being compressed, and is split as Part I data and Part II data in compression process, and is stored in terminal device this locality and Cloud Server respectively.Thus at terminal device by assault or stolen, or after Cloud Server is by assault, complete view data can not be obtained, the encryption technology avoiding current view data is comparatively loaded down with trivial details, and is easily cracked and causes the problem of privacy leakage.And a part of data upload only split out by image is in Cloud Server, without the need to carrying out digital encryption to whole view data, comparatively saves encryption times.

Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disk memory, CD-ROM, optical memory etc.) of computer usable program code.

The present invention describes with reference to according to the process flow diagram of the method for the embodiment of the present invention, equipment (system) and computer program and/or block scheme.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block scheme and/or square frame and process flow diagram and/or block scheme and/or square frame.These computer program instructions can being provided to the processor of multi-purpose computer, special purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computing machine or other programmable data processing device produce device for realizing the function of specifying in process flow diagram flow process or multiple flow process and/or block scheme square frame or multiple square frame.

These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in process flow diagram flow process or multiple flow process and/or block scheme square frame or multiple square frame.

These computer program instructions also can be loaded in computing machine or other programmable data processing device, make on computing machine or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computing machine or other programmable devices is provided for the step realizing the function of specifying in process flow diagram flow process or multiple flow process and/or block scheme square frame or multiple square frame.

Apply specific embodiment in the present invention to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims (8)

1. based on an image encryption method for cloud, it is characterized in that, comprising:

View data is compressed, and in compression process, is split as Part I data and Part II data;

Described Part I data are stored in terminal device this locality;

By described Part II data upload to Cloud Server, preserve described Part II data to make described Cloud Server.

2. the image encryption method based on cloud according to claim 1, is characterized in that, also comprise:

The Part I data of a view data are obtained from described terminal device this locality;

The Part II data of described view data are obtained from described Cloud Server;

Described Part I data and described Part II data are reduced, acquires described view data.

3. the image encryption method based on cloud according to claim 2, is characterized in that, describedly view data is compressed, and in compression process, be split as Part I data and Part II data, comprising:

Described view data being carried out jpeg format compression, obtaining DC converting coefficient and exchange conversion coefficient when carrying out the step of discrete cosine transform; Described Part I data comprise described exchange conversion coefficient; Described Part II data comprise described DC converting coefficient.

4. the image encryption method based on cloud according to claim 2, is characterized in that, describedly view data is compressed, and in compression process, be split as Part I data and Part II data, comprising:

Described view data being carried out JPEG2000 format compression, obtaining the lowest frequency signal that wavelet transformation produces when carrying out the step of wavelet transformation; Described Part I data comprise other signals except described lowest frequency signal that wavelet transformation produces; Described Part II data comprise described lowest frequency signal.

5. based on an image encrypting apparatus for cloud, it is characterized in that, comprising:

View data split cells, for view data being compressed, and is split as Part I data and Part II data in compression process;

Local storage unit, for being stored in terminal device this locality by described Part I data;

Data upload unit, for by described Part II data upload to Cloud Server, preserve described Part II data to make described Cloud Server.

6. the image encrypting apparatus based on cloud according to claim 5, is characterized in that, also comprise:

Part I data capture unit, for obtaining the Part I data of a view data from described terminal device this locality;

Part II data capture unit, for obtaining the Part II data of described view data from described Cloud Server;

View data reduction unit, for described Part I data and described Part II data being reduced, acquires described view data.

7. the image encrypting apparatus based on cloud according to claim 6, is characterized in that, described by view data split cells, specifically for:

Described view data being carried out jpeg format compression, obtaining DC converting coefficient and exchange conversion coefficient when carrying out the step of discrete cosine transform; Described Part I data comprise described exchange conversion coefficient; Described Part II data comprise described DC converting coefficient.

8. the image encrypting apparatus based on cloud according to claim 6, is characterized in that, described view data split cells, specifically for:

Described view data being carried out JPEG2000 format compression, obtaining the lowest frequency signal that wavelet transformation produces when carrying out the step of wavelet transformation; Described Part I data comprise other signals except described lowest frequency signal that wavelet transformation produces; Described Part II data comprise described lowest frequency signal.