CN105763763B - A kind of image encryption method - Google Patents

A kind of image encryption method Download PDF

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Publication number
CN105763763B
CN105763763B CN201610082651.9A CN201610082651A CN105763763B CN 105763763 B CN105763763 B CN 105763763B CN 201610082651 A CN201610082651 A CN 201610082651A CN 105763763 B CN105763763 B CN 105763763B
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values
hexadecimal
image
pixel
value
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CN105763763A (en
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李红芳
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Chongqing Technology and Business Institute
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Chongqing Technology and Business Institute
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N1/32101—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
    • H04N1/32144—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title embedded in the image data, i.e. enclosed or integrated in the image, e.g. watermark, super-imposed logo or stamp
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N1/32101—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
    • H04N1/32144—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title embedded in the image data, i.e. enclosed or integrated in the image, e.g. watermark, super-imposed logo or stamp
    • H04N1/32149—Methods relating to embedding, encoding, decoding, detection or retrieval operations
    • H04N1/32267—Methods relating to embedding, encoding, decoding, detection or retrieval operations combined with processing of the image
    • H04N1/32272—Encryption or ciphering

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Transmission Control (AREA)
  • Image Analysis (AREA)

Abstract

The invention discloses a kind of image encryption methods, belong to computer field of encryption, and facial image is obtained by image capture device, then carry out password generation according to the position of any pixel of facial image point and its rgb value and image is encrypted.The present invention can be according to adaptive generation password after user's recognition of face, and password formation speed is fast, and image can be encrypted in conjunction with the password generated, to be protected to image.During image encryption of the present invention, need not artificial setting code additionally be carried out to image, but after carrying out recognition of face by face identification device, unique password is automatically generated, the cryptosecurity degree is high and is adapted with the recombination of image, when the later stage decrypts, image decryption can be directly carried out according to password, compared with traditional image decryption mode, the present invention does not have to retrodict according to ciphering process, improves the safety of image encryption.

Description

A kind of image encryption method
Technical field
The invention belongs to computer field of encryption, more particularly to a kind of image encryption method.
Background technology
Network image is the means such as to deduce by multimedia come the work that shows using internet as display platform and communication media Product, since by powerful network media, network image has many advantages, such as quick-speed large-scale propagation, diversity, interactivity, has become For the important component of pop culture.But also due to the convenience of Internet communication, leads to the intellectual property of network image not It is vulnerable to protection, network piracy is encroached right causes huge loss to book-maker and copyright owner, is caused sternly to the development of the Internet culture Ghost image is rung, such as seriously affects the charge of photographic work, so that inhibiting the long-run development of photography industry.Therefore, media list Position is needed to carrying out copyright protection from copyrighted news picture and material picture, to prevent these pictures free by other unit It reprints or uses.
Simultaneously because user gives other people sometimes for by mobile terminal sharing picture, such as, bluetooth direct-connected by WIFI Etc. technologies picture is shared to other people；In shared procedure, if obtaining communication data by third party, third party can also obtain Image content；Even sometimes, user misoperation causes to be connected to third party user, and picture has accidentally been shared to third party (be such as connected to third party user when WIFI is direct-connected, and and unshared user), causes picture to share degree of safety low.
In order to realize that the copyright protection to picture, the prior art show mostly by adding the way of watermark on picture Have in technology while picture adds watermark, also affect the visibility of image, the simple watermark in part even can be by Reparation is cracked, far from safety of image transmission and effective protection is achieved the purpose that, while the prior art is also ineffective Disadvantage.
Invention content
In view of the drawbacks described above of the prior art, technical problem to be solved by the invention is to provide one kind capable of realizing figure As safe transmission and the encryption method of effective protection.
To achieve the above object, the present invention provides a kind of image encryption method, include the following steps：
Step 1: obtaining the square facial image that resolution ratio is a*a by image capture device, a is positive integer；
Step 2: setting in the facial image any one pixel as Pij, obtain pixel PijRgb value, the i, J is positive integer, and 1≤i≤a, 1≤j≤a；
Step 3: by pixel PijR values, G values and B values be respectively converted into corresponding hexadecimal values；
Judge pixel PijHexadecimal R values, hexadecimal G values and hexadecimal B values whether reach two；
As pixel PijHexadecimal R values, hexadecimal G values or hexadecimal B values less than two when, this less than two A character G is added on the hexadecimal value left side of position, to form pixel PijTwo R values character strings, two G values character strings and Two B value character strings, then execute step 4；As pixel PijHexadecimal R values, hexadecimal G values and hexadecimal B values When reaching two, step 4 is directly executed；
Step 4: by pixel PijTwo R values character strings, two G values character strings and two B values character strings from left to right It is arranged in order to form the first series string；
Step 5: i and j are respectively converted into corresponding hexadecimal values；
Whether the hexadecimal value of the hexadecimal value or j that judge i reaches four；When i hexadecimal value or j 16 When hex value is less than four, character G is added on the hexadecimal value left side less than four, to form four character strings and j of i Four character strings, then execute step 6；When the hexadecimal value of the hexadecimal value of i and j reaches four, step is executed Six；
Step 6: four character strings of j to be added to the left side of the first series string, and four character strings of i are added It is added to the left side of four character strings of the j, to form the second series string；
Step 7: the facial image is divided into 16*16 square areaChoosing Take the pixel PijThe region T at placeM, n, m, n are positive integer and 1≤m≤16,1≤n≤16；
Step 8: judging whether there is character G in the second series string；When including character G in the second number string, by the second series Character G in string replaces with 0, then executes step 9；When there is no character G in the second number string, step 9 is executed；
Step 9: setting the digit last of the second series string as Q1, set the inverse of the second series string Second digit is Q2；
By Q1And Q2It is respectively converted into decimal value；Calculate Q11=Q1+ 1 obtains Q11, calculate Q21=Q2+ 1 obtains Q21；Institute State 1≤Q11≤ 16, the 1≤Q21≤16；
It calculatesObtain first object area Domain TX, y；
By TM, nWith TX, yIt is replaced；
Step 10: the first row region and the third line region are replaced；Second row region and fourth line region are carried out It replaces；Fifth line region and the 7th row region are replaced；6th row region is replaced with the 8th row region；By the 9th Row region is replaced with the tenth a line region；Tenth row region is replaced with the 12nd row region；By the tenth zone Domain is replaced with the tenth five-element region；Ariadne region and the 16th row region are replaced.
, can be according to adaptive generation password after user's recognition of face using above technical scheme, and formation speed is fast, and Image can be encrypted in conjunction with the password generated, to be protected to image.
Preferably, choosing the pixel P in the step 7ijThe region T at placeM, nIt carries out according to the following steps：
It calculatesM is obtained, is calculatedObtain n；According to the value chosen area T of m and nM, n。
Preferably, in step 1, the square facial image for being a*a by image capture device acquisition resolution ratio is by following Step carries out：
The facial image that resolution ratio is a*b is obtained by image capture device, a is the pixel quantity of horizontal direction, and b is vertical Histogram to pixel quantity；
Judge whether a>b；
Work as a>When b, W is calculated1=a-b obtains number W to be increased1, then vertically add W1A rgb value Wei ﹛ The pixel of 0,0,0 ﹜, then executes step 2；
Work as a<When b, W is calculated2=b-a obtains number W to be increased2, W is then added in the horizontal direction2A rgb value Wei ﹛ The pixel of 0,0,0 ﹜, and the numerical value of b is assigned to a, then execute step 2；
As a=b, step 2 is executed.
The present invention also provides a kind of image decryption methods, include the following steps：
S1, encrypted image is divided into 16*16 square areaThe first row is to Four row regions are the first encrypting module, and fifth line to the 8th row region is the second encrypting module, the 9th row to the 12nd row region For third encrypting module, the 13rd row to the 16th row region is the 4th encrypting module；
S2, password input by user is received；
S3, judge whether the password input by user is 14 digit strings；When password input by user is 14 digit string, Execute step S4；When password input by user is not 14 digit string, S2 is returned to step；
S4, judge input in password whether have character G；When in password including character G, the character G in password is replaced It is 0, then executes step S5；When there is no character G in password, step S5 is executed；
S5, parallel progress region is determining and rgb value is converted；
The region determines and carries out according to the following steps：
A1, the 1st to 4 digit of extraction password forms third series string from left to right, and converts thereof into decimal value U1；The 5th to 8 digit of extraction password forms fourth stage number string from left to right, and converts thereof into decimal value U2；
The 14th digit of password is extracted from left to right, and converts thereof into decimal value U3；Password is extracted from left to right The 13rd digit, and convert thereof into decimal value U4；
A2, region T to be changed is chosenR, t, r, t are positive integer and 1≤r≤16,1≤t≤16：
It calculatesR is obtained, is calculatedObtain t；Region to be changed is chosen according to the value of r and t TR, t；
A3, U is calculated31=U3+ 1 obtains U31, calculate U41=U4+ 1 obtains U41；1≤the U31≤ 16, the 1≤U41≤ 16；
It calculatesObtain the second target area TP, q；1≤p≤16,1≤q≤16；
A4, selection TP, qCorresponding encrypting module, and the encrypting module is decrypted：By the first row of the encrypting module It is replaced with the third line of the encrypting module, the second row of the encrypting module and the fourth line of the encrypting module is replaced It changes；
A5, judgementWhether with TP, qPositioned at the same encrypting module；WhenWith TP, qPositioned at the same encryption When module, step A6 is executed；WhenWith TP, qIt, will not in the same encrypting modulePlace encrypting module carries out Decryption：It willThe first row of place encrypting module is replaced with the third line of the encrypting module, willPlace adds The second row and the fourth line of the encrypting module of close module are replaced, and then execute step A6；
A6, by TR, tWith TP, qIt is replaced；
The rgb value conversion carries out according to the following steps：
The the 9th and the 10th digit of extraction password forms level V number string from left to right, and converts thereof into decimal value U5；The the 11st and the 12nd digit of extraction password forms the 6th series string from left to right, and converts thereof into decimal value U6；From The the 13rd and the 14th digit that left-to-right extracts password forms the 7th series string, and converts thereof into decimal value U7；
S6, rgb value matching is carried out：
Selected pixels point1≤i≤a, 1≤j≤a, and i, j, a are positive integer；It willR values, G values and B Value respectively with U5、U6And U7It is compared；JudgeR values whether be equal to U5, whenR values be not equal to U5When, terminate Decryption；WhenR values be equal to U5When, judgeG values whether be equal to U6；WhenG values be not equal to U6When, terminate Decryption；WhenG values be equal to U6When, judgeB values whether be equal to U7；WhenB values be not equal to U7When, terminate Decryption；WhenB values whether be equal to U7When, execute step S7；
S7, judge the first encrypting module to the 4th encrypting module successively, if to be decrypted；By what is be not decrypted Encrypting module is decrypted：
The third line of the first row and the encrypting module of not decrypting encrypting module is replaced, encrypting module will not decrypted The second row and the fourth line of the encrypting module be replaced.
The beneficial effects of the invention are as follows：The present invention can be according to adaptive generation password after user's recognition of face, password life It is fast at speed, and image can be encrypted in conjunction with the password generated, to be protected to image.Image encryption mistake of the present invention Cheng Zhong additionally need not carry out artificial setting code to image, but after carrying out recognition of face by face identification device, automatically Unique password is generated, the cryptosecurity degree is high and is adapted with the recombination of image, can be straight according to password when the later stage decrypts Row image decryption is tapped into, compared with traditional image decryption mode, the present invention does not have to retrodict according to ciphering process, improves The safety of image encryption.
Specific implementation mode
With reference to embodiment, the invention will be further described：
A kind of image encryption method, includes the following steps：
Step 1: obtaining the square facial image that resolution ratio is a*a by image capture device, a is positive integer；
Step 2: setting in the facial image any one pixel as Pij, obtain pixel PijRgb value, the i, J is positive integer, and 1≤i≤a, 1≤j≤a；
Step 3: by pixel PijR values, G values and B values be respectively converted into corresponding hexadecimal values；
Judge pixel PijHexadecimal R values, hexadecimal G values and hexadecimal B values whether reach two；
As pixel PijHexadecimal R values, hexadecimal G values or hexadecimal B values less than two when, this less than two A character G is added on the hexadecimal value left side of position, to form pixel PijTwo R values character strings, two G values character strings and Two B value character strings, then execute step 4；As pixel PijHexadecimal R values, hexadecimal G values and hexadecimal B values When reaching two, step 4 is executed；
Step 4: by pixel PijTwo R values character strings, two G values character strings and two B values character strings from left to right It is arranged in order to form the first series string；
Step 5: i and j are respectively converted into corresponding hexadecimal values；
Whether the hexadecimal value of the hexadecimal value or j that judge i reaches four；When i hexadecimal value or j 16 When hex value is less than four, character G is added on the hexadecimal value left side less than four, to form four character strings and j of i Four character strings, then execute step 6；When the hexadecimal value of the hexadecimal value of i and j reaches four, step is executed Six；
Step 6: four character strings of j to be added to the left side of the first series string, and four character strings of i are added It is added to the left side of four character strings of the j, to form the second series string；
Step 7: the facial image is divided into 16*16 square areaChoosing Take the pixel PijThe region T at placeM, n, m, n are positive integer and 1≤m≤16,1≤n≤16；
Step 8: judging whether there is character G in the second series string；When including character G in the second number string, by the second series Character G in string replaces with 0, then executes step 9；When there is no character G in the second number string, step 9 is executed；
Step 9: setting the digit last of the second series string as Q1, set the inverse of the second series string Second digit is Q2；
By Q1And Q2It is respectively converted into decimal value；Calculate Q11=Q1+ 1 obtains Q11, calculate Q21=Q2+ 1 obtains Q21；Institute State 1≤Q11≤ 16, the 1≤Q21≤16；
It calculatesObtain first object area Domain TX, y；
By TM, nWith TX, yIt is replaced；
Step 10: the first row region and the third line region are replaced；Second row region and fourth line region are carried out It replaces；Fifth line region and the 7th row region are replaced；6th row region is replaced with the 8th row region；By the 9th Row region is replaced with the tenth a line region；Tenth row region is replaced with the 12nd row region；By the tenth zone Domain is replaced with the tenth five-element region；Ariadne region and the 16th row region are replaced.
In the present embodiment, the pixel P is chosen in the step 7ijThe region T at placeM, nIt carries out according to the following steps：
It calculatesM is obtained, is calculatedObtain n；According to the value chosen area T of m and nM, n。
In the present embodiment, in step 1, the square facial image that resolution ratio is a*a is obtained by image capture device and is pressed Following steps carry out：
The facial image that resolution ratio is a*b is obtained by image capture device, a is the pixel quantity of horizontal direction, and b is vertical Histogram to pixel quantity；
Judge whether a>b；
Work as a>When b, W is calculated1=a-b obtains number W to be increased1, then vertically add W1A rgb value Wei ﹛ The pixel of 0,0,0 ﹜, then executes step 2；
Work as a<When b, W is calculated2=b-a obtains number W to be increased2, W is then added in the horizontal direction2A rgb value Wei ﹛ The pixel of 0,0,0 ﹜, and the numerical value of b is assigned to a values after a obtains increase pixel, then execute step 2；
As a=b, step 2 is executed.
A kind of image decryption method, includes the following steps：
S1, encrypted image is divided into 16*16 square areaThe first row is to Four row regions are the first encrypting module, and fifth line to the 8th row region is the second encrypting module, the 9th row to the 12nd row region For third encrypting module, the 13rd row to the 16th row region is the 4th encrypting module；
S2, password input by user is received；
S3, judge whether the password input by user is 14 digit strings；When password input by user is 14 digit string, Execute step S4；When password input by user is not 14 digit string, S2 is returned to step；
S4, judge input in password whether have character G；When in password including character G, the character G in password is replaced It is 0, then executes step S5；When there is no character G in password, step S5 is executed；
S5, parallel progress region is determining and rgb value is converted；
The region determines and carries out according to the following steps：
A1, the 1st to 4 digit of extraction password forms third series string from left to right, and converts thereof into decimal value U1；The 5th to 8 digit of extraction password forms fourth stage number string from left to right, and converts thereof into decimal value U2；
The 14th digit of password is extracted from left to right, and converts thereof into decimal value U3；Password is extracted from left to right The 13rd digit, and convert thereof into decimal value U4；
A2, region T to be changed is chosenR, t, r, t are positive integer and 1≤r≤16,1≤t≤16：
It calculatesR is obtained, is calculatedObtain t；Region to be changed is chosen according to the value of r and t TR, t；
A3, U is calculated31=U3+ 1 obtains U31, calculate U41=U4+ 1 obtains U41；1≤the U31≤ 16, the 1≤U41≤ 16；
It calculatesObtain the second target area TP, q；1≤p≤16,1≤q≤16；
A4, selection TP, qCorresponding encrypting module, and the encrypting module is decrypted：By the first row of the encrypting module It is replaced with the third line of the encrypting module, the second row of the encrypting module and the fourth line of the encrypting module is replaced It changes；
A5, judgementWhether with TP, qPositioned at the same encrypting module；WhenWith TP, qPositioned at the same encryption When module, step A6 is executed；WhenWith TP, qIt, will not in the same encrypting modulePlace encrypting module carries out Decryption：It willThe first row of place encrypting module is replaced with the third line of the encrypting module, willPlace adds The second row and the fourth line of the encrypting module of close module are replaced, and then execute step A6；
A6, by TR, tWith TP, qIt is replaced；
The rgb value conversion carries out according to the following steps：
The the 9th and the 10th digit of extraction password forms level V number string from left to right, and converts thereof into decimal value U5；The the 11st and the 12nd digit of extraction password forms the 6th series string from left to right, and converts thereof into decimal value U6；From The the 13rd and the 14th digit that left-to-right extracts password forms the 7th series string, and converts thereof into decimal value U7；
S6, rgb value matching is carried out：
Selected pixels point1≤i≤a, 1≤j≤a, and i, j, a are positive integer；It willR values, G values and B Value respectively with U5、U6And U7It is compared；JudgeR values whether be equal to U5, whenR values be not equal to U5When, terminate Decryption；WhenR values be equal to U5When, judgeG values whether be equal to U6；WhenG values be not equal to U6When, terminate Decryption；WhenG values be equal to U6When, judgeB values whether be equal to U7；WhenB values be not equal to U7When, terminate Decryption；WhenB values whether be equal to U7When, execute step S7；
S7, judge the first encrypting module to the 4th encrypting module successively, if to be decrypted；By what is be not decrypted Encrypting module is decrypted：
The third line of the first row and the encrypting module of not decrypting encrypting module is replaced, encrypting module will not decrypted The second row and the fourth line of the encrypting module be replaced.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that those skilled in the art without It needs creative work according to the present invention can conceive and makes many modifications and variations.Therefore, all technologies in the art Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea Technical solution, all should be in the protection domain being defined in the patent claims.

Claims (3)

1. a kind of image encryption method, it is characterised in that include the following steps：
Step 1: obtaining the square facial image that resolution ratio is a*a by image capture device, a is positive integer；
Step 2: setting in the facial image any one pixel as Pij, obtain pixel PijRgb value, described i, j are Positive integer, and 1≤i≤a, 1≤j≤a；
Step 3: by pixel PijR values, G values and B values be respectively converted into corresponding hexadecimal values；
Judge pixel PijHexadecimal R values, hexadecimal G values and hexadecimal B values whether reach two；
As pixel PijHexadecimal R values, hexadecimal G values or hexadecimal B values less than two when, this less than two A character G is added on the hexadecimal value left side, to form pixel PijTwo R values character strings, two G values character strings and two B value character strings, then execute step 4；As pixel PijHexadecimal R values, hexadecimal G values and hexadecimal B values reach At two, step 4 is executed；
Step 4: by pixel PijTwo R values character strings, two G values character strings and two B values character strings from left to right successively Arrangement form the first series string；
Step 5: i and j are respectively converted into corresponding hexadecimal values；
Whether the hexadecimal value of the hexadecimal value or j that judge i reaches four；When the hexadecimal value of i or the hexadecimal of j When value is less than four, character G is added on the hexadecimal value left side less than four, with formed i four character strings and j four Position character string, then executes step 6；When the hexadecimal value of the hexadecimal value of i and j reaches four, step 6 is executed；
Step 6: four character strings of j to be added to the left side of the first series string, and four character strings of i are added to The left side of four character strings of the j, to form the second series string；
Step 7: the facial image is divided into 16*16 square areaChoose institute State pixel PijThe region T at placeM, n, m, n are positive integer and 1≤m≤16,1≤n≤16；
Step 8: judging whether there is character G in the second series string；When in the second series string including character G, by the second series string In character G replace with 0, then execute step 9；When there is no character G in the second series string, step 9 is executed；
Step 9: setting the digit last of the second series string as Q1, set the penultimate of the second series string Number is Q2；
By Q1And Q2It is respectively converted into decimal value；Calculate Q11=Q1+ 1 obtains Q11, calculate Q21=Q2+ 1 obtains Q21；Described 1 ≤Q11≤ 16, the 1≤Q21≤16；
It calculatesObtain first object region TX, y；
By TM, nWith TX, yIt is replaced；
Step 10: the first row region and the third line region are replaced；Second row region is replaced with fourth line region； Fifth line region and the 7th row region are replaced；6th row region is replaced with the 8th row region；By the 9th row area Domain is replaced with the tenth a line region；Tenth row region is replaced with the 12nd row region；By the tenth zone domain with Tenth five-element region is replaced；Ariadne region and the 16th row region are replaced.
2. a kind of image encryption method as described in claim 1, it is characterized in that：The pixel P is chosen in the step 7ij The region T at placeM, nIt carries out according to the following steps：
It calculatesM is obtained, is calculatedObtain n；According to the value chosen area T of m and nM, n。
3. a kind of image encryption method as described in claim 1, it is characterized in that：In step 1, obtained by image capture device It is that the square facial image of a*a carries out according to the following steps to take resolution ratio：
The facial image that resolution ratio is a*b is obtained by image capture device, a is the pixel quantity of horizontal direction, and b is Vertical Square To pixel quantity；
Judge whether a>b；
Work as a>When b, W is calculated1=a-b obtains number W to be increased1, then vertically add W1A rgb value Wei ﹛ 0,0, The pixel of 0 ﹜, then executes step 2；
Work as a<When b, W is calculated2=b-a obtains number W to be increased2, W is then added in the horizontal direction2A rgb value Wei ﹛ 0,0, The pixel of 0 ﹜, and the numerical value of b is assigned to a, then execute step 2；
As a=b, step 2 is executed.
CN201610082651.9A 2016-02-05 2016-02-05 A kind of image encryption method Expired - Fee Related CN105763763B (en)

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