JP5589109B2 - Information encryption apparatus, information encryption / decryption system, information encryption program, and information encryption method - Google Patents

Description

  The present invention relates to information encryption and decryption techniques.

  Conventionally, the format of information (hereinafter also referred to as data) may be different before and after encryption / decryption. For example, when the object of encryption / decryption is an image, the encrypted image cannot be pasted on the web page as it is. In this case, for example, it is necessary to use another tag. Further, since the screen configuration is changed, the balance of the design of the web page cannot be maintained. In order to maintain the balance of the design, it takes time and technology to correct it. If you don't apply them, you're at the expense of design balance.

  In Patent Document 1, even if a computer does not have an application for decrypting encrypted data, it is an object to be able to display data indicating a headline or an outline of the encrypted data. The encrypted data is generated and the encrypted data is used as the original data encrypted file, and the header describing the contents related to the encrypted data is used as the header file. The original data encrypted file and the header file are 1 in appearance. It is stored as one encrypted data file, and this encrypted data file can display only the header file on a general application, while the header file can be read on an application that can read the encrypted data file. Later, the encrypted data is decrypted by entering the password. , By creating a file of the decrypted data, it is disclosed that the display reads the created file.

  Japanese Patent Application Laid-Open No. 2004-228561 has an object to enable a plurality of users having different authorities to access the same area when there is no inclusion relationship when information disclosure is selectively controlled according to a user. The content is divided into a plurality of areas according to the authority, and a divided area is generated by generating a different secret key (encryption / decryption key of common key encryption technology) for each divided area and using the generated secret key. The content is encrypted every time, and the generated private key is encrypted using the public key of public key encryption technology preset for the user according to each authority, and a plurality of users with different authorities are encrypted. In contrast, it is disclosed that the secret key is encrypted separately, and the ciphertext is generated from the encrypted content and the secret key obtained thereby.

JP 2003-316653 A JP 2007-251921 A

Patent Document 1 and Patent Document 2 disclose a method of dividing original information to be encrypted into a plurality of units and performing encryption for each unit.
However, in either case, the processing range is the whole or a part, and the processing method itself is a mathematical process on binary data (Mod or other data change in bit units), and the maintenance of the data format (compression format, etc.) Therefore, the problem of incorporating encrypted data into a web page cannot be solved.
The present invention has been made in the background of such a background art, and is an information encryption device , an information encryption / decryption system, an information encryption program, and information that maintain the information format before and after the encryption process. It aims to provide an encryption method . In particular, when the target information is image information, it is possible to incorporate the encrypted image information into the web page without taking time and maintaining the balance of the web page design. It is aimed.

The gist of the present invention for achieving the object lies in the inventions of the following items.
[1] Information receiving means for receiving divided information, arrangement changing means for changing the arrangement of divided information received by the information receiving means, and encryption for encrypting information relating to the arrangement changed by the arrangement changing means Means for transmitting the information whose arrangement has been changed by the arrangement changing means and the information encrypted by the encryption means, and division information similar to the division information received by the information receiving means Search means for searching for information is provided, and the arrangement changing means changes the arrangement of the division information received by the information receiving means based on the arrangement of the division information in the similar information searched by the search means. This is an information encryption apparatus characterized by the above.

[ 2 ] Information receiving means for receiving the divided information, arrangement changing means for changing the arrangement of the divided information received by the information receiving means, and encryption for encrypting information relating to the arrangement changed by the arrangement changing means A transmission means for transmitting the second information whose arrangement has been changed by the arrangement changing means and the first information encrypted by the encryption means, and the division information received by the information receiving means, A search unit for searching for information having similar division information, wherein the arrangement changing unit receives the division received by the information reception unit based on the arrangement of the division information in the similar information searched by the search unit; rearrange the information receiving means for receiving the first information and the second information transmitted by said transmitting means to said receiving means Decoding means for decoding the first information received in this manner, and restoration means for restoring the arrangement of the second information received by the receiving means based on information relating to the arrangement which is the information decoded by the decoding means And an output means for outputting the information restored by the restoration means.

[ 3 ] The computer encrypts the information receiving means for receiving the divided information, the arrangement changing means for changing the arrangement of the divided information received by the information receiving means, and the information regarding the arrangement changed by the arrangement changing means. Encryption means for converting, transmission means for transmitting information whose arrangement has been changed by the arrangement changing means, information encrypted by the encryption means, and division similar to the division information received by the information receiving means Functioning as search means for searching for information having information, wherein the arrangement changing means is arranged based on the arrangement of the division information in the similar information searched by the search means, and the arrangement of the division information received by the information reception means. This is an information encryption program characterized by changing .

[ 4 ] An information encryption method performed by an information encryption apparatus including an information reception unit, an arrangement change unit, an encryption unit, a transmission unit, and a search unit , wherein the information reception unit receives the divided information; The arrangement changing unit changes the arrangement of the division information received by the information receiving unit, the encryption unit encrypts information related to the arrangement changed by the arrangement changing unit, and the transmission unit The information whose arrangement has been changed by the changing means and the information encrypted by the encrypting means are transmitted, and the search means searches for information having division information similar to the division information received by the information receiving means. The arrangement changing unit is received by the information receiving unit based on the arrangement of the division information in the similar information searched by the searching unit. It is information encryption method and changing the arrangement of the split information.

  According to the information encryption device, the information encryption / decryption system, the information encryption program, and the information encryption method according to the present invention, the format of information before and after the encryption process can be maintained.

It is a conceptual module block diagram about the structural example of 1st Embodiment. It is a flowchart which shows the process example by 1st Embodiment. It is a conceptual module block diagram about the structural example of 2nd Embodiment. It is a flowchart which shows the process example by 2nd Embodiment. It is explanatory drawing which shows the system configuration example in the case of implement | achieving this Embodiment. It is explanatory drawing which shows the data structure example of object information. It is explanatory drawing which shows the data structure example of arrangement | positioning information. It is explanatory drawing which shows the example of a data structure of the object information after a change. It is a conceptual module block diagram about the structural example of 3rd Embodiment. It is a flowchart which shows the process example by 3rd Embodiment. It is a block diagram which shows the hardware structural example of the computer which implement | achieves this Embodiment.

Hereinafter, examples of various preferred embodiments for realizing the present invention will be described with reference to the drawings.
<First Embodiment>
FIG. 1 is a conceptual module configuration diagram of a configuration example according to the first embodiment.
The module generally refers to components such as software (computer program) and hardware that can be logically separated. Therefore, the module in the present embodiment indicates not only a module in a computer program but also a module in a hardware configuration. Therefore, the present embodiment is a computer program for causing these modules to function (a program for causing a computer to execute each procedure, a program for causing a computer to function as each means, and a function for each computer. This also serves as an explanation of the program and system and method for realizing the above. However, for the sake of explanation, the words “store”, “store”, and equivalents thereof are used. However, when the embodiment is a computer program, these words are stored in a storage device or stored in memory. It is the control to be stored in the device. Modules may correspond to functions one-to-one, but in mounting, one module may be configured by one program, or a plurality of modules may be configured by one program, and conversely, one module May be composed of a plurality of programs. The plurality of modules may be executed by one computer, or one module may be executed by a plurality of computers in a distributed or parallel environment. Note that one module may include other modules. Hereinafter, “connection” is used not only for physical connection but also for logical connection (data exchange, instruction, reference relationship between data, etc.). “Predetermined” means that the process is determined before the target process, and not only before the process according to this embodiment starts but also after the process according to this embodiment starts. In addition, if it is before the target processing, it is used in accordance with the situation / state at that time or with the intention to be decided according to the situation / state up to that point. When there are a plurality of “predetermined values”, they may be different values, or two or more values (of course, including all values) may be the same.
In addition, the system or device is configured by connecting a plurality of computers, hardware, devices, and the like by communication means such as a network (including one-to-one correspondence communication connection), etc., and one computer, hardware, device. The case where it implement | achieves by etc. is also included. “Apparatus” and “system” are used as synonymous terms. Of course, the “system” does not include a social “mechanism” (social system) that is an artificial arrangement.
In addition, when performing a plurality of processes in each module or in each module, the target information is read from the storage device for each process, and the processing result is written to the storage device after performing the processing. is there. Therefore, description of reading from the storage device before processing and writing to the storage device after processing may be omitted. Here, the storage device may include a hard disk, a RAM (Random Access Memory), an external storage medium, a storage device via a communication line, a register in a CPU (Central Processing Unit), and the like.

The information encryption apparatus according to the first embodiment encrypts information. As shown in the example of FIG. 1, the information encryption apparatus 100 includes an information reception module 110, an arrangement change module 120, It has an encryption module 130, a transmission module 140, and a display module 150.
The information reception module 110 is connected to the arrangement change module 120. The information reception module 110 receives the divided information. Here, the target information includes image information (which may be either a still image or a moving image), audio information, or a combination thereof. The divided information corresponds to an image divided into blocks as a result of the compression processing or the like, for example, a JPEG image block (8 × 8 pixels). The target information has a format. This will be described with reference to the example of FIG. FIG. 6 is an explanatory diagram showing a data structure example of the target information 600 received by the information receiving module 110. The target information 600 includes header information 610, division information A620, division information B630, and the like. A JPEG image has “header information 610, a set of blocks (division information A620, division information B630, etc.)” as a format. The header information 610 includes information on the format, for example, the number of vertical pixels and the number of horizontal pixels of the image.

The arrangement change module 120 is connected to the information reception module 110, the encryption module 130, the transmission module 140, and the display module 150. The arrangement change module 120 changes the arrangement of the division information received by the information reception module 110. This corresponds to encryption processing of target information itself in the information encryption apparatus 100. For example, a random number (including a pseudo random number) is used to change the arrangement. The arrangement pattern by random numbers is, for example, an image of 640 × 480 pixels, and there are 4800 blocks of 8 × 8 pixels. It becomes street.
A method for changing the arrangement will be described. When the number of divided information is N, numbers 1 to N are prepared in order in the array, and they are replaced at random. In the above-described JPEG image, if the M-th number after random replacement is L, it means that the M-th 8 × 8 pixel block in the image is moved to the L-th. These are adapted to all 8 × 8 pixel blocks in the image. Specifically, the first number in the array is changed to a number (L1) randomly extracted from 1 to N numbers, and the second number is randomly extracted from 1 to N numbers other than L1. It changes to (L2), and changing the 3rd number to the number (L3) extracted at random from the numbers 1-N other than L1 and L2 is repeated to the Nth number. Then, the blocks are rearranged according to the numbers in this array. This will be described with reference to the example of FIG. FIG. 7 is an explanatory diagram showing an example of the data structure of the arrangement information 700. The arrangement information 700 indicates that the first block is moved to the 250th position, the second block is moved to the 140th position, the third block is moved to the 75th position, and the like.
Here, the change of the arrangement is to replace a part other than the header information. Therefore, even after the processing by the arrangement changing module 120 is performed, the header information remains at the position in the original information (generally, the head position). In the example of FIG. 6, the data after the division information A620 is switched, and is as in the example of FIG. FIG. 8 is an explanatory diagram showing an example of the data structure of the post-change target information 800. The post-change target information 800 includes header information 810, division information X820, division information N830, and the like. That is, the position of the header information 610 in the target information 600 shown in the example of FIG. 6 is the top header information 810 in the post-change target information 800. is there.

In addition, the arrangement change module 120 may group the target division information and change the arrangement within the group. By this processing, the information amount of the information regarding the arrangement (specifically, the arrangement information 700 shown in the example of FIG. 7) can be reduced. For example, an 8 × 8 pixel block of image data is grouped into a number that is a divisor of N, and the arrangement is changed within the group. The number of groups may be divided as long as the number of 8 × 8 pixel blocks in each group is equal. However, it is preferable that the size of each group is equal. This is to keep the image size of the original image equal to the image size after the rearrangement. Also, if the arrangement is changed using the same “information about arrangement” for each group, the amount of information of “information about arrangement” itself can be reduced. The rearrangement pattern is N! From the street (N / d)! (N / d)! If is a sufficiently large number, the security in encryption can be maintained. Of course, in this case, it is necessary to include information indicating how the target information is grouped (in the above example, the number of groups d, the grouping method described later) in the “placement information”. is there.
As an example of grouping 8 × 8 pixel blocks of an image, (1) the first N / d 8 × 8 pixel block of the image is group 1, the next N / d block is group 2, .., the last group is divided into groups d, and (2) when M is the Mth 8 × 8 pixel block in the image, there is a method of grouping with the same surplus in M / d, etc. .

The encryption module 130 is connected to the arrangement change module 120 and the transmission module 140. The encryption module 130 encrypts information regarding the arrangement changed by the arrangement changing module 120. Here, “information relating to arrangement” is information in the aforementioned array. Specifically, it is the arrangement information 700 shown in the example of FIG. The encryption here may be a public key encryption method or an encryption method using a common key. Of course, in the public key cryptosystem, encryption processing is performed with the public key of the user to whom the encrypted information is transmitted. When decrypting, decryption processing is performed with the secret key of the user.
The transmission module 140 is connected to the arrangement change module 120 and the encryption module 130. The transmission module 140 transmits the information whose arrangement has been changed by the arrangement changing module 120 and the information encrypted by the encryption module 130. The transmission destination is the information decoding apparatus 300 according to the second embodiment described later, and is restored to the original information by the information decoding apparatus 300.
The display module 150 is connected to the arrangement change module 120. The display module 150 displays the information whose arrangement has been changed by the arrangement changing module 120 on the display device. What is displayed here is the format of the original information as it is, but the contents are those whose arrangement has been changed. Therefore, there is no change in the design of the web page, but a person who sees it cannot determine the original information. This is because the arrangement of the blocks in the image is switched, but the header information remains the same, and the capacity of the information after processing by the arrangement changing module 120 is not changed, so the format is maintained.

FIG. 2 is a flowchart illustrating a processing example according to the first exemplary embodiment.
In step S202, the information reception module 110 receives the divided information.
In step S204, the arrangement change module 120 changes the arrangement of the division information.
In step S206, the encryption module 130 encrypts information regarding the changed arrangement.
In step S <b> 208, the transmission module 140 transmits the information whose arrangement has been changed and the encrypted information to the information decryption apparatus 300.
In step S210, the display module 150 displays the information whose arrangement has been changed on the display device.

<Second Embodiment>
FIG. 3 is a conceptual module configuration diagram of a configuration example according to the second embodiment. The information decryption apparatus according to the second embodiment decrypts the information encrypted by the information encryption apparatus 100. As shown in the example of FIG. 3, the information decryption apparatus 300 includes a reception module 310. A decoding module 320, a restoration module 330, and an output module 340.

The reception module 310 is connected to the decryption module 320 and the restoration module 330. The receiving module 310 receives the encrypted first information and the second information whose arrangement has been changed. That is, the first information is information encrypted by the encryption module 130 (specifically, information obtained by encrypting the arrangement information 700 shown in the example of FIG. 7), and the second information is arranged by the arrangement change module 120. Is the changed information (specifically, the post-change target information 800 shown in the example of FIG. 8).
The decryption module 320 is connected to the reception module 310 and the restoration module 330. The decryption module 320 decrypts the first information received by the reception module 310. Specifically, the arrangement information 700 shown in the example of FIG. 7 is obtained by the decryption process corresponding to the encryption process by the encryption module 130.

The restoration module 330 is connected to the reception module 310, the decryption module 320, and the output module 340. The restoration module 330 restores the arrangement of the second information received by the reception module 310 based on the information regarding the arrangement, which is the information decoded by the decoding module 320. That is, using the information indicating the arrangement changed by the arrangement changing module 120, processing for returning the changed arrangement to the original is performed. If it demonstrates using the above-mentioned example, what is necessary is just to move the Lth block to the Mth. Referring to the example of FIG. 7, the 250th block is returned to the first, the 140th block is returned to the second, the 75th block is returned to the third, and so on. That is, the target information 600 shown in the example of FIG. 6 is obtained from the post-change target information 800 shown in the example of FIG. It is to be noted that the division information other than the header information is changed, and the position of the header information remains at the head.
The output module 340 is connected to the restoration module 330. The output module 340 outputs the information restored by the restoration module 330. For example, a JPEG image is decoded to generate an image, and the image is displayed on a display device.

FIG. 4 is a flowchart illustrating a processing example according to the second exemplary embodiment.
In step S402, the reception module 310 receives the information transmitted by the information encryption apparatus 100.
In step S404, the decryption module 320 decrypts the encrypted information from the received information, and extracts information related to the arrangement.
In step S406, the restoration module 330 rearranges the division information in the received information using the information regarding the decoded arrangement.
In step S408, the output module 340 outputs the rearranged information.

  FIG. 5 is an explanatory diagram showing a system configuration example in the case of realizing the present embodiment. The information encryption device 100 according to the first embodiment and the information decryption device 300 according to the second embodiment are connected via a communication line 590. The information processed (encrypted, rearranged) by the information encryption apparatus 100 is processed (decrypted, restored) by the information decryption apparatus 300. The communication line 590 may be either wired or wireless. Instead of the information encryption device 100, an information encryption device 900 described later may be used.

<Third Embodiment>
FIG. 9 is a conceptual module configuration diagram of an exemplary configuration according to the third embodiment. The information encryption apparatus according to the third embodiment encrypts information. As shown in the example of FIG. 9, the information encryption apparatus 900 includes an information reception module 110, a search module 915, an arrangement, A change module 120, an encryption module 130, a transmission module 140, and a display module 150 are included. In addition, the same code | symbol is attached | subjected to the site | part of the same kind as 1st Embodiment, and the overlapping description is abbreviate | omitted. In the first embodiment, the arrangement is changed using random numbers, but here, the arrangement of the images is changed to resemble the searched similar images. That is, the arrangement is changed in accordance with the arrangement of an image similar to the target image. The image whose arrangement has been changed (the processing result by the arrangement changing module 120) is displayed by the display module 150, but the image whose arrangement has been changed may be displayed as if it were an image similar to the target image. it can. In other words, this is to make the web design look more natural.

The information reception module 110 is connected to the arrangement change module 120 and the search module 915.
The search module 915 is connected to the information reception module 110 and the arrangement change module 120. The search module 915 searches for information having division information similar to the division information received by the information reception module 110. Here, “similar” means that the distance (difference) between the information received by the information receiving module 110 (divided information) and the target information is less than or less than a predetermined value. An object to be compared may be, for example, an RGB histogram or a pixel value. The search target may be an image in a web page connected to the Internet, or may be an image stored in an image database. Note that the division information is compared here. Specifically, it is a block of JPEG images, and the entire image does not need to be similar.

  The arrangement change module 120 is connected to the information reception module 110, the search module 915, the encryption module 130, the transmission module 140, and the display module 150. The arrangement change module 120 changes the arrangement of the division information received by the information reception module 110 based on the arrangement of the division information in the similar information searched by the search module 915. Here, “based on the arrangement of the division information in the similar information” means to change the arrangement in accordance with the arrangement in the similar image of the block similar to the target block. That is, the block A is moved to the arrangement in the similar image of the block B similar to the block A of the target image. As a result, the image whose arrangement has been changed is similar to a similar image.

FIG. 10 is a flowchart illustrating a processing example according to the third exemplary embodiment.
In step S1002, the information reception module 110 receives the divided information.
In step S1004, the search module 915 searches for information similar to the target information.
In step S1006, the arrangement change module 120 changes the arrangement of the division information.
In step S1008, the encryption module 130 encrypts information regarding the changed arrangement.
In step S1010, the transmission module 140 transmits the information whose arrangement has been changed and the encrypted information to the information decryption apparatus 300.
In step S1012, the display module 150 displays the information whose arrangement has been changed on the display device.
In addition, when resembling the original image to a similar image, in addition to the arrangement of each block, each square block may be rotated at any angle of 90 degrees, 180 degrees, 270 degrees, or inverted. Good. That is, the search module 915 performs rotation processing and inversion processing on either the block received by the information reception module 110 or the block to be searched, and the similarity between the resulting block and the other block May be determined. This widens the range of objects of similar images.
Then, information on rotation processing and inversion processing is added to the arrangement information for each block. Specifically, information indicating that either or both of rotation processing and reversal processing have been performed, information indicating rotation angle in the case of rotation processing, vertical reversal, horizontal reversal in the case of reversal processing, and the like. Add.
In step S1006 in the flowchart illustrated in FIG. 10, the arrangement change module 120 not only changes the arrangement of the division information, but also performs rotation processing and inversion processing on each necessary block.

  Note that the hardware configuration of the computer on which the program according to the present embodiment is executed is a general computer as illustrated in FIG. 11, and specifically, a personal computer, a computer that can be a server, a mobile phone ( Including smartphones). That is, as a specific example, the CPU 1101 is used as a processing unit (calculation unit), and the RAM 1102, the ROM 1103, and the HD 1104 are used as storage devices. For example, a hard disk may be used as the HD 1104. A CPU 1101 that executes programs such as an information reception module 110, an arrangement change module 120, an encryption module 130, a transmission module 140, a display module 150, a reception module 310, a decryption module 320, a restoration module 330, an output module 340, and a search module 915; A RAM 1102 for storing the program and data, a ROM 1103 for storing a program for starting the computer, an HD 1104 as an auxiliary storage device, and a user's operation on a keyboard, a mouse, a touch panel, and the like. A communication line interface 11 for connecting to a receiving device 1106 for receiving data, an output device 1105 such as a liquid crystal display, and a communication network such as a network interface card. 7, and, and a bus 1108 for exchanging data by connecting them. A plurality of these computers may be connected to each other via a network.

Among the above-described embodiments, the computer program is a computer program that reads the computer program, which is software, in the hardware configuration system, and the software and hardware resources cooperate with each other. Is realized.
Note that the hardware configuration illustrated in FIG. 11 illustrates one configuration example, and the present embodiment is not limited to the configuration illustrated in FIG. 11, and is a configuration capable of executing the modules described in the present embodiment. I just need it. For example, some modules may be configured by dedicated hardware (for example, ASIC), and some modules may be in an external system and connected via a communication line. A plurality of systems shown in FIG. 5 may be connected to each other via communication lines so as to cooperate with each other.

The program described above may be provided by being stored in a recording medium, or the program may be provided by communication means. In that case, for example, the above-described program may be regarded as an invention of a “computer-readable recording medium recording the program”.
The “computer-readable recording medium on which a program is recorded” refers to a computer-readable recording medium on which a program is recorded, which is used for program installation, execution, program distribution, and the like.
The recording medium is, for example, a digital versatile disc (DVD), which is a standard established by the DVD Forum, such as “DVD-R, DVD-RW, DVD-RAM,” and DVD + RW. Standard “DVD + R, DVD + RW, etc.”, compact disc (CD), read-only memory (CD-ROM), CD recordable (CD-R), CD rewritable (CD-RW), Blu-ray disc ( Blu-ray Disc (registered trademark), magneto-optical disk (MO), flexible disk (FD), magnetic tape, hard disk, read-only memory (ROM), electrically erasable and rewritable read-only memory (EEPROM (registered trademark)) )), Flash memory, Random access memory (RAM) SD (Secure Digital) memory card and the like.
The program or a part of the program may be recorded on the recording medium for storage or distribution. Also, by communication, for example, a local area network (LAN), a metropolitan area network (MAN), a wide area network (WAN), a wired network used for the Internet, an intranet, an extranet, etc., or wireless communication It may be transmitted using a transmission medium such as a network or a combination of these, or may be carried on a carrier wave.
Furthermore, the program may be a part of another program, or may be recorded on a recording medium together with a separate program. Moreover, it may be divided and recorded on a plurality of recording media. Further, it may be recorded in any manner as long as it can be restored, such as compression or encryption.

DESCRIPTION OF SYMBOLS 100 ... Information encryption apparatus 110 ... Information reception module 120 ... Arrangement change module 130 ... Encryption module 140 ... Transmission module 150 ... Display module 300 ... Information decryption apparatus 310 ... Reception module 320 ... Decryption module 330 ... Restoration module 340 ... Output module 915 ... Search module

Claims (4)

Information receiving means for receiving the divided information;
Arrangement changing means for changing the arrangement of the division information received by the information receiving means;
Encryption means for encrypting information relating to the arrangement changed by the arrangement changing means;
Transmitting means for transmitting the information whose arrangement has been changed by the arrangement changing means and the information encrypted by the encryption means ;
Retrieval means for retrieving information having division information similar to the division information received by the information reception means
Comprising
The information changing apparatus, wherein the arrangement changing unit changes the arrangement of the divided information received by the information receiving unit based on the arrangement of the divided information in the similar information searched by the searching unit. Information receiving means for receiving the divided information;
Arrangement changing means for changing the arrangement of the division information received by the information receiving means;
Encryption means for encrypting information relating to the arrangement changed by the arrangement changing means;
Transmitting means for transmitting the second information whose arrangement has been changed by the arrangement changing means and the first information encrypted by the encryption means;
Retrieval means for retrieving information having division information similar to the division information received by the information reception means
Comprising
The arrangement changing unit changes the arrangement of the division information received by the information receiving unit based on the arrangement of the division information in the similar information searched by the search unit,
Receiving means for receiving the first information and the second information transmitted by the transmitting means;
Decoding means for decoding the first information received by the receiving means;
Restoring means for restoring the arrangement of the second information received by the receiving means based on the information about the arrangement which is the information decoded by the decoding means;
An information encryption / decryption system comprising output means for outputting information restored by the restoration means. Computer
Information receiving means for receiving the divided information;
Arrangement changing means for changing the arrangement of the division information received by the information receiving means;
Encryption means for encrypting information relating to the arrangement changed by the arrangement changing means;
Transmitting means for transmitting the information whose arrangement has been changed by the arrangement changing means and the information encrypted by the encryption means ;
Retrieval means for retrieving information having division information similar to the division information received by the information reception means
Function as
The arrangement changing unit changes the arrangement of the division information received by the information receiving unit based on the arrangement of the division information in the similar information searched by the search unit.
An information encryption program characterized by that . An information encryption method performed by an information encryption apparatus including an information reception unit, an arrangement change unit, an encryption unit, a transmission unit, and a search unit ,
The information receiving means receives the divided information,
The arrangement changing unit changes the arrangement of the division information received by the information receiving unit,
The encryption means encrypts information relating to the arrangement changed by the arrangement changing means,
The transmission means transmits the information whose arrangement is changed by the arrangement changing means and the information encrypted by the encryption means ,
The search means searches for information having division information similar to the division information received by the information reception means,
The information changing method, wherein the arrangement changing unit changes the arrangement of the division information received by the information receiving unit based on the arrangement of the division information in the similar information searched by the search unit .

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