JP2007159001A - Data recording and reproducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To encrypt and record data based on an encryption key coded into a two-dimensional code. <P>SOLUTION: A digital camera 3 photographs a two-dimensional code 2 for which an encryption key 1 and an instruction code 5 are coded (step S1) and when the encryption key 1 and the instruction code 5 are read (step S2), a photographing mode is switched from an ordinary mode to a secrecy protection mode, photographed data such as image data or video data of a photographed object are encrypted based on the encryption key 1 and then recorded/stored (step S4) on a recording medium 4 that is inserted into the digital camera 3 (step S3). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a data recording / reproducing apparatus, and more particularly to a data recording / reproducing apparatus for encrypting and recording data.

A data storage method of a conventional digital camera will be described with reference to FIG. As shown in FIG. 6, the conventional digital camera 11 uses a general-purpose data format (for example, jpeg (Joint Photographic Experts Group) or gif (Graphic Interchange Format) to capture captured image data such as captured image data and moving image data in a recording medium 4. Etc.) (step S8). Then, the photographing data written in the recording medium 4 is read and displayed on a display unit (not shown) (step S9).
The image pickup apparatus includes an image pickup apparatus and an image reproduction apparatus, and the image pickup apparatus includes an image signal processing unit that generates an encryption signal by encrypting the image signal using an encryption key stored in the encryption key storage unit. Then, the image reproduction device uses the decryption key corresponding to the encryption key stored in the decryption key storage unit to decrypt the image signal from the encrypted signal, and the decrypted image signal There is a reproduction unit that reproduces an image of a subject based on the image reproduction system, and an image reproduction system in which an image cannot be reproduced without permission by another person (for example, see Patent Document 1).
JP 2002-320194 A

However, the conventional digital camera 11 has the following problems. The first problem is that if the digital camera 11 is lost or if the recording medium 4 of the digital camera 11 is stolen by a third party, the data recorded on the recording medium 4 after shooting will be leaked to the third party. There is a fear. That is, data such as images and moving images taken by the digital camera 11 is written to the recording medium 4 composed of a nonvolatile memory or the like, but since the recording medium 4 is often attached to the digital camera 11, the digital camera In the case where 11 is lost or stolen, data recorded on the recording medium 4 attached to the digital camera 11 may leak to a third party.
In the invention described in Patent Document 1, the encryption key is stored in the encryption key storage unit of the image reproduction system, and the decryption key is stored in the decryption key storage unit. Therefore, there is a problem that reproduction can be performed only by an image reproduction apparatus having a decryption key.
The present invention has been made in view of such a situation, and an object thereof is to provide a data recording / reproducing apparatus capable of solving the above-described problems.

The data recording / reproducing apparatus according to claim 1 is a data recording / reproducing apparatus for encrypting data, recording the data on a recording medium, and reproducing the data, and reading means for reading an encryption key used when encrypting the data; An encryption unit that encrypts data based on an encryption key read by the reading unit, and a recording unit that records the data encrypted by the encryption unit on a predetermined recording medium.
In addition, it is possible to further include decryption means for decrypting the data recorded on the recording medium based on the encryption key read by the reading means.
The encryption key is encoded into a two-dimensional code, and the reading unit can read the encryption key encoded into the two-dimensional code.
The data recording / reproducing method according to claim 4 is a data recording / reproducing method for encrypting data, recording the data on a recording medium, and reproducing the data, and reading the encryption key used when encrypting the data; An encryption step for encrypting data based on the encryption key read in the reading step, and a recording step for recording the data encrypted in the encryption step on a predetermined recording medium are provided.
In addition, it is possible to further comprise a decrypting step for decrypting the data recorded on the recording medium based on the encryption key read in the reading step.
Further, the encryption key is encoded into a two-dimensional code, and in the reading step, the encryption key encoded into the two-dimensional code can be read.
A data recording / reproducing program according to claim 7 is a data recording / reproducing program for controlling a data recording / reproducing apparatus for encrypting data, recording the data on a recording medium, and reproducing the data, and encrypting the data. A reading step for reading a key, an encryption step for encrypting data based on the encryption key read in the reading step, and a recording step for recording the data encrypted in the encryption step on a predetermined recording medium The recording / reproducing apparatus executes the processing.
In addition, it is possible to further comprise a decrypting step for decrypting the data recorded on the recording medium based on the encryption key read in the reading step.
Further, the encryption key is encoded into a two-dimensional code, and in the reading step, the encryption key encoded into the two-dimensional code can be read.

  According to the present invention, since shooting data such as shot images and videos are encrypted and recorded, leakage of data to a third party can be suppressed. In addition, since the encryption key for encrypting data is two-dimensionally encoded and the encryption key included in the two-dimensional code is read, the encryption key read from the two-dimensional code can be read even if the encryption key is not provided. Data can be decrypted based on.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a procedure for storing captured data such as captured image data and moving image data in the recording medium 4. In the digital camera 3 as an embodiment of the present invention, a recording medium 4 for storing image data such as image data and moving image data is inserted, and an encryption key 1 and an instruction code 5 are encoded. The encryption key 1 and the instruction code 5 are read from the generated two-dimensional code 2, the photographing mode is switched to the security mode based on the instruction code, and the photographing data is encrypted based on the encryption key 1.

  The digital camera 3 includes a control unit (not shown) that controls each unit, an image sensor such as a CCD (Charge Coupled Device) that captures an image, and condenses light from the subject on the image sensor, thereby capturing an image of the subject. A lens formed above, a lens driving unit that translates the lens in a direction to approach the image sensor and away from the image sensor, a display unit including an LCD (Liquid Crystal Display) that displays various information, and various modes Switching, various settings, an operation unit for instructing to reproduce recorded data such as recorded image data and moving image data, a speaker for generating a predetermined sound effect, a shutter for instructing photographing, It comprises a reset switch for instructing the control unit to switch the photographing mode.

  As shown in FIG. 1, the two-dimensional code 2 is an instruction command (in this example, “001000101...”) 5 for instructing the control unit of the digital camera 3 to switch the digital camera 3 to the security mode. And an encryption key randomly generated (in this example, “Abcdef...”) 1. Then, based on the command command 5, the shooting mode of the digital camera 3 is switched to the security mode, and based on the encryption key 1, image data corresponding to the photographed subject image, movie data corresponding to the subject movie, and the like. The shooting data is encrypted.

  Next, with reference to FIG. 1, a procedure for shooting a subject in the case where shooting data such as image data or moving image data of the shot subject is not desired to be viewed by a third party will be described. First, the user generates the two-dimensional code 2 bitmap image data by encoding the encryption key 1 and the command command 5, and prints the generated bitmap image data on a predetermined sheet using a printer (not shown). A two-dimensional code 2 is issued (step S1).

  Next, the user points the lens of the digital camera 3 toward the two-dimensional code 2, presses the shutter, and photographs the two-dimensional code 2. The control unit of the digital camera 3 analyzes the image formed on the image sensor to recognize the deviation from the focal point, controls the lens driving unit to move the lens in a predetermined direction, and changes the focal point to the two-dimensional code 2. Match.

  When the focus is on the two-dimensional code 2, a message indicating that the focus is on is displayed on the display unit, a predetermined sound effect is output from the speaker, the two-dimensional code 2 is photographed, and the photographed two-dimensional code 2 The image data corresponding to the image is recorded on the recording medium 4. That is, under the control of the control unit, image data corresponding to an image formed by light condensed on the image sensor is supplied to the recording medium 4 and stored therein. Next, the control unit reads the command command 5 and the encryption key 1 from the image data of the two-dimensional code recorded on the recording medium 4 (Step S2).

  Next, the control unit of the digital camera 3 switches the photographing mode to the security mode based on the read command command 5. The security mode is a mode in which the digital camera 3 captures a subject and reads from the two-dimensional code 2 under the control of the control unit when writing image data such as image data or moving image data of the photographed subject to the recording medium 4. In this mode, the shooting data is encrypted based on the encryption key 1 and the encrypted shooting data is recorded on the recording medium 4. Switching from the security mode to the normal mode can be performed by pressing a reset switch (not shown) of the digital camera 3.

  Next, when the user inserts the recording medium 4 into the digital camera 3 (step S3), points the lens of the digital camera 3 toward the subject, and presses the shutter, the subject is photographed under the control of the control unit. Shooting data corresponding to an image or a moving image is encrypted based on the encryption key 1 and then stored in the recording medium 4 (step S4).

  Next, with reference to FIG. 2, a procedure for browsing image data such as image data and moving image data of a subject imaged in the security mode by the digital camera 3 will be described.

  As shown in FIG. 2, when shooting data such as image data or moving image data shot in the security mode is displayed on the display unit of the digital camera 3 and browsed, first, the user must use the encryption key 1 and the instruction code. 5 is encoded (step S1). A two-dimensional code 2 is prepared. Next, in order to switch the photographing mode to the security mode, the lens of the digital camera 3 is pointed at the two-dimensional code 2, and when the user presses the shutter, the two-dimensional code 2 is focused after being controlled by the control unit. Is photographed, and the encryption key 1 and the instruction code 5 are read (step S2).

  That is, after the shutter is pressed, the control unit of the digital camera 3 captures the two-dimensional code 2 and temporarily stores the image data of the two-dimensional code 2 in the RAM. Next, based on the image data of the two-dimensional code 2 stored in the RAM, the instruction command 5 and the encryption key 1 encoded in the two-dimensional code 2 are read and stored in the RAM. Next, the control unit switches the photographing mode to the security mode based on the instruction code 5.

  Next, the user inserts the recording medium 4 into the digital camera 3 (step S3). Next, in a state where the shooting mode of the digital camera 3 is switched to the security mode, when the operation unit is operated by the user and reproduction of shooting data such as image data or moving image data is instructed, the control unit The photographic data is read from the recording medium 4, and the read photographic data is decrypted based on the encryption key 1.

  Next, the control unit supplies the decoded shooting data to the display unit of the digital camera 3. The display unit displays the shooting data supplied by the control unit (step S6).

  Next, the operation unit is operated by the user, and the captured data encrypted based on the encryption key 1 stored in the recording medium 4 is connected to the digital camera 3 with a USB cable or the like (personal computer). 6, when instructed to transfer to a peripheral device such as the printer 7 or the like, the control unit only captures the shooting data recorded on the recording medium 4 when the shooting mode is switched to the security mode. 3 can be transferred to a personal computer 6 or a printer 7 as peripheral devices (step S7). The security mode can be switched to the normal mode by operating the reset switch of the digital camera 3.

  The configuration and operation of the embodiment of the present invention have been described above. The method for generating the two-dimensional code 2 in FIG. 1 and the method for the digital camera 3 to read the two-dimensional code 2 in FIGS. Since it is already widely known and is not directly related to the present invention, a detailed description of its configuration and operation is omitted.

  FIG. 3 is a flowchart showing in detail the procedure at the time of shooting in the security mode shown in FIG. FIG. 4 is a flowchart showing in detail a procedure at the time of reproduction of image data such as image data and moving image data imaged in the security mode shown in FIG.

  First, the procedure at the time of shooting in the security mode shown in FIG. 1 will be described in detail with reference to the flowchart of FIG.

  First, in step S21, when the user presses a power switch (not shown) of the digital camera 3, the digital camera 3 is activated. Next, in step S22, it is not necessary for the user to shoot in the security mode because shooting data corresponding to the image or video of the subject shot by the digital camera 3 is not leaked to a third party. It is determined whether or not there is something.

  When the user determines that it is not necessary to shoot in the security mode, the user presses the shutter with the normal mode set as the shooting mode at the time of activation. In this case, it is determined by the control unit that shooting in the normal mode has been instructed, and the process proceeds to step S26. In step S26, the control unit captures an image or moving image of the subject in the normal mode. Thereafter, the process proceeds to step S30, and image data corresponding to the photographed subject image or moving image data corresponding to the subject moving image is supplied to the recording medium 4 and stored.

  On the other hand, if it is determined that the user needs to shoot in the security mode, in step S23, the user prepares the two-dimensional code 2, directs the lens of the digital camera 3 toward the two-dimensional code 2, and presses the shutter. To do. When the shutter is pressed, the control unit focuses on the two-dimensional code 2 that is a subject, captures the two-dimensional code 2, and stores image data corresponding to the captured two-dimensional code 2 in the RAM.

  Next, in step S24, the control unit reads the instruction command 5 and the encryption key 1 from the two-dimensional code 2 stored in the RAM. Now, since the command command 5 read from the two-dimensional code 2 is a command to switch the shooting mode to the security mode, the control unit switches the shooting mode to the security mode based on the command command 5, The security mode is started (step S5).

  Next, in step S26, when the user points the digital camera 3 at the subject and presses the shutter, the subject image or moving image is taken. That is, the control unit analyzes the image of the subject formed on the image sensor to calculate the deviation from the focus, controls the lens driving unit to move the lens in a predetermined direction, and focuses the subject. Thereafter, image data corresponding to the image of the subject formed on the image sensor or moving image data corresponding to the moving image of the subject is temporarily stored in the RAM.

  Thereafter, the process proceeds to step S27, where the control unit encrypts the shooting data such as the image data and the moving image data stored in the RAM based on the encryption key 1, and the encrypted shooting data such as the image data and the moving image data is recorded on the recording medium. 4 and store. Thereafter, when the photographing in the security mode is terminated, the user presses the reset switch.

  Next, in step S28, the control unit determines whether shooting in the security mode has been completed. That is, it is determined whether or not the user has pressed the reset switch. As a result, when it is determined that the reset switch has not been pressed by the user and the photographing in the security mode has not been completed, the process returns to step S26, and the processes after step S26 are repeatedly executed. On the other hand, if the user presses the reset switch and determines that shooting in the security mode has been completed, the process proceeds to step S29, where the control unit switches the shooting mode from the security mode to the normal mode, and the security mode. End.

  When the process in step S29 or the process in step S30 ends, the process proceeds to step S31. In step S31, the control unit determines whether or not the user has operated the power switch to instruct the power off. As a result, when it is determined that the power switch has been operated and the power-off has been instructed, a predetermined end process for canceling the photographing enabled state is executed, and the power of the digital camera 3 is turned off.

  Next, with reference to the flowchart of FIG. 4, the operation at the time of reproducing image data such as image data and moving image data captured in the security mode shown in FIG. 2 will be described in detail.

  First, in step S41, when the user presses a power switch (not shown) of the digital camera 3, the digital camera 3 is activated.

  Next, in step S42, the control unit determines whether there is shooting data shot in the security mode on the recording medium 4. As a result, if it is determined that there is no shooting data shot in the security mode, the process proceeds to step S47.

  In step S47, the photographic data stored in the recording medium 4 is reproduced by the control unit and displayed on the display unit, and the photographic data is stored in the personal computer 6 and the printer 7 which are peripheral devices connected to the digital camera 3. Transferred.

  On the other hand, when the control unit determines in step S42 that there is shooting data shot in the security mode on the recording medium 4, the process proceeds to step S43.

  In step S43, the user prepares the two-dimensional code 2, directs the lens of the digital camera 3 toward the two-dimensional code 2, and presses the shutter. When the shutter is pressed, in step S44, the control unit focuses on the two-dimensional code 2 as a subject, photographs the two-dimensional code 2, and stores image data corresponding to the photographed two-dimensional code 2 in the RAM. Let

  Next, the control unit reads the instruction command 5 and the encryption key 1 from the two-dimensional code 2 stored in the RAM. In this example, the command command 5 read from the two-dimensional code 2 is a command for instructing to switch the photographing mode to the security mode. In this case, the control unit of the digital camera 3 based on the command command 5 The photographing mode is switched to the security mode, and the security mode is started (step S45).

  Next, in step S <b> 46, the control unit reads the photographing data stored in the recording medium 4 in a predetermined order and decrypts it based on the encryption key 1 read from the two-dimensional code 2.

  Next, in step S47, the control unit supplies the decoded shooting data to the display unit. The display unit displays the shooting data supplied from the control unit. Further, the decoded photographing data is transferred to the personal computer 6 and the printer 7 which are peripheral devices connected to the digital camera 3.

  Next, in step S48, the control unit determines whether or not the reproduction in the security mode has been completed. That is, it is determined whether or not all of the shooting data stored in the recording medium 4 or all of the data instructed by the user has been reproduced.

  As a result, when it is determined that the reproduction in the security mode has not been completed, the process returns to step S46, and the processes after step S46 are repeatedly executed. On the other hand, if it is determined that the reproduction in the security mode has been completed, the process proceeds to step S49.

  In step S49, it is determined by the control unit whether or not the reset switch has been pressed by the user. If it is determined that the reset switch has been pressed, the control unit sets the shooting mode of the digital camera 3 from the security mode to the normal mode. Switch to mode.

  When the process in step S49 ends, or when the photographing data reproduction process and transfer process in the normal mode end in step S47, the process proceeds to step S50. In step S50, the control unit determines whether or not the user has operated the power switch to instruct power off. As a result, when it is determined that the power switch is operated and the power-off is instructed, a predetermined end process for releasing the reproducible state is executed, and the power of the digital camera 3 is turned off.

  In the present embodiment, the encryption key 1 and the instruction code 5 shown in FIGS. 1 and 2 are encoded in advance to create a two-dimensional code 2, and the digital camera 3 is caused to photograph the two-dimensional code 2. The control unit of the digital camera 3 reads the encryption key 1 and the instruction code 5 encoded from the photographed two-dimensional code 2 and switches the photographing mode of the digital camera 3 to the security mode based on the instruction code 5.

  Next, shooting data such as subject image data and moving image data shot in the security mode is encrypted based on the encryption key 1 encoded in the two-dimensional code 2 by the control unit and recorded on the recording medium 4. The When the image is not shot in the security mode (when shot in the normal mode), it is recorded on the recording medium 4 without being encrypted. In the case of shooting in the normal mode, the shooting data recorded on the recording medium 4 can be reproduced and displayed on the display unit of the digital camera 3 or transferred to a peripheral device connected to the digital camera 3. The photographed data photographed in the security mode cannot be reproduced and displayed on the display unit or transferred to the peripheral device unless decrypted by using the encryption key 1 encoded in the two-dimensional code 2. It has become.

  In this way, the digital camera 3 uses the encryption key 1 read from the two-dimensional code 2 without using a physical key or the like to protect the security of the recorded content, and the subject recorded on the recording medium after shooting. It is possible to safely and effectively conceal the image data (captured recorded image) and moving image data (captured recorded video).

  As described above, the present embodiment has the following effects. That is, when shooting image data such as image data or moving image data shot by the digital camera 3 is written to the recording medium 4, the shooting data is encrypted and written to the recording medium 4, so the digital camera 3 or the recording medium 4 is lost. Even in this case, it is possible to prevent the captured data from being reproduced and leaked to a third party.

  In addition, in order to encrypt image data such as image data and moving image data, the 2D code 2 encoded with the encryption key 1 is used instead of the physical key, and the 2D code 2 is imaged. Since the encryption key 1 is read, even if the two-dimensional code 2 is lost, the two-dimensional code 2 can be generated and issued again if only the character string constituting the encryption key 1 is known. Therefore, the photographic data can be decrypted based on the encryption key 1 encoded in the two-dimensional code 2, and the recorded photographic data cannot be reproduced.

  Further, since the encryption key 1 is not included in the apparatus, if the two-dimensional code 2 obtained by encoding the encryption key 1 is provided, the reproduction can be performed by another apparatus.

  In addition, the user can set an arbitrary character string as the encryption key 1, and the two-dimensional code 2 obtained by encoding the character string as the encryption key 1 can be easily created. Therefore, the encryption key 1 can be easily changed frequently, and the security can be further improved.

  FIG. 5 shows a procedure for encrypting photographed data such as photographed image data and moving image data and storing it in the recording medium 4 in another embodiment of the present invention. As shown in FIG. 5, in the present embodiment, instead of the digital camera 3, shooting data such as image data or moving image data of a subject shot using a mobile phone 8 with a camera, a digital video camera 9, or the like is recorded. The medium 4 is encrypted and stored. In the camera-equipped mobile phone 8 and the digital video camera 9 as well, the configuration and procedure for executing the function of recording the photographic data on the recording medium 4 are basically the same as those in the embodiment shown in FIGS. Are the same, and when the photographic data is encrypted and recorded on the recording medium 4, the encryption key 1 encoded in the two-dimensional code 2 is used.

  In the embodiment shown in FIG. 5 as well, the same effects as those in the embodiment shown in FIGS. 1 and 2 can be obtained.

  It should be noted that the configuration and operation of the above-described embodiment are examples, and it goes without saying that they can be changed as appropriate without departing from the spirit of the present invention.

  As an application example of the present invention, for example, the present invention can be applied not only to a digital camera but also to other electronic devices having a camera function.

In the present invention, it is a diagram showing a procedure for storing shooting data of a shot subject in a recording medium. In the present invention, it is a diagram showing a procedure for browsing the shooting data of the subject shot in the security mode. It is a flowchart for demonstrating the detailed procedure which preserve | saves the photography data image | photographed using the digital camera in a recording medium. It is a flowchart for demonstrating the detailed procedure which browses the imaging | photography data of the to-be-photographed object image | photographed in the security mode using the digital camera. It is a figure which shows the procedure which preserve | saves the imaging | photography data of the to-be-photographed object image | photographed using the mobile phone or the digital video camera in a recording medium. It is a flowchart for demonstrating the procedure which records and reproduces | regenerates the image data and moving image data of the object image | photographed using the conventional digital camera on a recording medium.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Encryption key 2 Two-dimensional code 3 Digital camera 4 Recording medium 5 Command command 6 Personal computer 7 Printer 8 Mobile phone 9 Digital video camera

Claims (9)

A data recording / reproducing apparatus for encrypting data, recording the data on a recording medium, and reproducing the data,
Reading means for reading an encryption key used when encrypting the data;
Encryption means for encrypting the data based on the encryption key read by the reading means;
A data recording / reproducing apparatus comprising: recording means for recording the data encrypted by the encryption means on a predetermined recording medium. The data recording / reproducing apparatus according to claim 1, further comprising: a decrypting unit that decrypts the data recorded on the recording medium based on the encryption key read by the reading unit. The data recording / reproducing apparatus according to claim 1, wherein the encryption key is encoded into a two-dimensional code, and the reading unit reads the encryption key encoded into the two-dimensional code. A data recording / reproducing method for encrypting and recording data on a recording medium and reproducing the data,
A reading step of reading an encryption key used when encrypting the data;
An encryption step of encrypting the data based on the encryption key read in the reading step;
A data recording / reproducing method comprising: a recording step of recording the data encrypted in the encryption step on a predetermined recording medium. The data recording / reproducing method according to claim 4, further comprising a decrypting step of decrypting the data recorded on the recording medium based on the encryption key read in the reading step. 6. The data recording / reproducing method according to claim 4, wherein the encryption key is encoded into a two-dimensional code, and in the reading step, the encryption key encoded into the two-dimensional code is read. . A data recording / reproducing program for controlling a data recording / reproducing apparatus for encrypting and recording data on a recording medium and reproducing the data,
A reading step of reading an encryption key used when encrypting the data;
An encryption step of encrypting the data based on the encryption key read in the reading step;
A data recording / reproducing program that causes the data recording / reproducing apparatus to execute a recording step of recording the data encrypted in the encryption step on a predetermined recording medium. The data recording / reproducing program according to claim 7, further comprising a decrypting step of decrypting the data recorded on the recording medium based on the encryption key read in the reading step. The data recording / reproducing program according to claim 7 or 8, wherein the encryption key is encoded into a two-dimensional code, and in the reading step, the encryption key encoded into the two-dimensional code is read. .

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