KR20190107596A - Method of deleting data for mobile device - Google Patents

Abstract

The present invention relates to a method for deleting data stored in a terminal to prevent leakage of personal information when the terminal is reused, and more particularly, to a method for deleting data of a terminal, which includes an encryption step of encrypting data prior to a connection step of being connected to a mobile device and a deletion step of deleting a data area of the mobile device in a connection state, such that data cannot be opened by being encrypted even if other users arbitrarily attempt to restore data, the possibility of data restoration is more perfectly prevented by mixing an infinite random number scheme and a zero-fill scheme in a random overwriting step, and a sector is divided to be processed by a parallel process so as to have a fast speed in the random overwriting step. The method for deleting data of a terminal of the present invention comprises: a connection step of connecting a terminal to enter a debugging mode; an encryption step of encrypting a data area of a memory of the terminal; a deletion step of deleting the encrypted data area; a random overwriting step of fully deleting data by recording characters in the data area; and an initialization step of performing factory initialization for the terminal deleted with the data area. In the random overwriting step, an infinite random number input scheme for removing all data by recording characters not overlapping each other in a part of the data area and a zero-fill scheme for recording 0 or 1 in the other part of the data area.

Description

How to delete data on your device {METHOD OF DELETING DATA FOR MOBILE DEVICE}

The present invention relates to a method of deleting data stored in a terminal in order to prevent leakage of personal information when the terminal is recycled. More particularly, the present invention relates to a data area of the mobile device in a connected state. The encryption step of encrypting data prior to the deletion step of deleting the data, even if another user attempts to recover the data arbitrarily, the data is encrypted and can not be opened, and the random overwrite method and the zero-fill method in the random overwrite step Mixed data is more completely blocked from the possibility of recovering data, and the random overwrite step relates to a method of rapidly deleting data of a terminal by dividing a sector into a parallel process.

Terminals such as smartphones, tablet PCs, and laptops are expensive products as a collection of the latest technologies.

Therefore, interest and demand for expensive used terminals are increasing, and transactions are actively made.

In the case of used terminals, the internal function is also important, but the appearance of the exterior is considered the most important factor in the valuation of used terminals (smartphones, tablet PCs, etc.). The largest part of the exterior is occupied by the screen (display) that takes the largest area and the button that functions as the key. In particular, the appearance of scratches, scratches, and cracks are the main items, and identifying them and classifying them is the most important task of valuation.

The value, or price, of a used terminal is evaluated by examining its condition. The state inspection of the used terminal is mainly performed by a human, which is difficult to guarantee the objectivity of the valuation (ie price) of the used terminal. That is, the valuation may vary according to the proficiency, condition, criteria, etc. of the inspector with the same used terminal, and if the price of the used terminal is low, the owner also has low reliability for the valuation by the inspector.

In addition, the inspection of second-hand terminals by the inspector has a disadvantage of slowness.

Therefore, Patent Document No. 10-2017-0019085 "Used mobile terminal automatic valuation method and apparatus" has been disclosed as a conventional technology that can secure objectivity by automating the valuation of used terminals.

The Korean Patent Application Publication No. 10-2017-0019085 discloses a case, bezel, tempered glass, screen, etc. of a used mobile terminal by photographing a used mobile terminal placed inside an automatic valuation device and analyzing the captured image. Inspect the appearance automatically.

Recently, terminals are being used in various fields such as financial transactions, personal authentication, and data storage using terminals. Accordingly, the necessity of security for the information processed in the terminal is also increasing.

In particular, the terminal is a completely personalized terminal, where personal data or personal information is recorded and stored. Therefore, when data stored in the terminal is leaked, there is a problem that the personal information of each person is also leaked.

As a result, personal information stored in second-hand goods is more likely to be leaked. In particular, even if deleted, data may be used for a crime by restoring a data through a separate restoration program. have.

Therefore, when recycling used terminals purchased through reasonable valuation, it is necessary to block the leakage by deleting various information stored in the memory of the used terminals.

Conventional technology for deleting data of a terminal has been disclosed in Korean Patent Laid-Open Publication No. 10-2012-0018965, "System for providing a file backup, restoration and data permanent deletion service for a mobile terminal and a portable computing device and method thereof".

As described above, even if the data is completely deleted, it is possible to recover through the data remaining in the memory or the cache, so that personal information may be leaked.

In the prior art, a large amount of time is required for the random overwriting step of repeatedly writing a character in a data area to completely remove data.

The present invention has been made to solve the problems of the prior art, and through the encryption step of encrypting all the data area before deleting the data area so that the previously recorded personal information is not easily recovered, and repeatedly records the characters By using random overwrite in combination with infinite random number method and zero fill method, data is more completely removed, and random overwrite can delete data of terminal that can be processed quickly in parallel process by dividing data area into multiple sectors. The purpose is to provide a method.

Data deletion method of the terminal according to the present invention for achieving the above object

Connecting to enter a debugging mode by connecting a terminal;

Encrypting a data area of the terminal memory;

A deleting step of deleting the encrypted data area;

A random overwriting step of completely deleting data by writing a character in the data area;

In the initializing step of initializing the terminal to which the data area is deleted;

The random overwrite step

Infinite random number input method for removing all data by writing with characters not overlapping each other in the data area, and zero-fill method for recording as 0 or 1 in another part of the data area.

And the random overwrite step

And dividing the data area into sectors having a dividing capacity, and completely deleting data in the divided random sectors by the infinite random number input method and the zero-fill method, and simultaneously processing a plurality of sectors in a parallel process.

The encrypting step is characterized by encrypting the cache area of the terminal memory.

Data deletion method of the terminal according to the present invention

Before deleting the data of the terminal, configure an encryption step that encrypts all data areas, so that even if the data is restored intentionally, the restored data is encrypted so that it cannot be opened. Can,

The random overwrite is a combination of infinite random number and zero fill method, which completely blocks the recoverability of data, and the data area is divided into multiple sectors and processed in parallel to remove data more quickly.

As a method for deleting data in a terminal, the invention is very useful for industrial development.

1 is a schematic block diagram of an appearance photographing analysis system for valuation of a used terminal according to the present invention.
2 is a view showing an example of a camera unit and an illumination unit provided in the dark room of the housing according to the present invention.
3 is a view showing the positional relationship between the camera unit and the lighting unit for photographing the state of the upper surface of the used terminal.
4 is a view showing the positional relationship between the camera unit and the lighting unit for photographing the state of the used terminal.
5 is a view showing the positional relationship between the camera unit and the lighting unit for photographing the lower surface of the used terminal.
6 is a view showing the positional relationship between the camera unit and the lighting unit for photographing the state of the screen disposed on the upper surface of the used terminal.
7 is a view showing the relationship between the viewing angle of the camera for shooting the entire used terminal and the resulting shooting position.
8 is a view illustrating a structure in which one camera photographs multiple surfaces of a used terminal at the same time using a reflection mirror.
9 is a procedure showing a process of initializing by deleting the data of the used terminal purchased through the valuation.

Hereinafter, with reference to the drawings will be described in more detail with respect to the appearance photographing analysis system for evaluating the value of the used terminal according to the present invention and the data deletion method of the terminal.

Prior to explaining in more detail with respect to the appearance photographing analysis system for evaluating the value of the used terminal according to the present invention and the data deletion method of the terminal,

Since the present invention may be modified in various ways and have various forms, embodiments (or embodiments) will be described in detail in the text. However, this is not intended to limit the present invention to the specific form disclosed, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

In each of the drawings, the same reference numerals, in particular, the tens and ones digits, or the same digits, tens, ones, and alphabets refer to members having the same or similar functions, and unless otherwise specified, each member in the figures The member referred to by the reference numeral may be regarded as a member conforming to these criteria.

In addition, in the drawings, the components are exaggerated in size (or thick) in size (or thick) in size (or thin) or simplified in consideration of the convenience of understanding and the like, thereby limiting the scope of protection of the present invention. It should not be.

The terminology used herein is for the purpose of describing particular embodiments (suns, aspects, and embodiments) (or embodiments) only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms “comprises” or “consists” are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, but one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

First, the appearance photographing analysis system for valuation of a used terminal according to the present invention will be described with reference to FIGS. 1 to 8.

As shown in FIG. 1 and FIG. 2, the exterior photographing analysis system for evaluating the value of the used terminal according to the present invention includes a main body 10, a camera unit 20, a lighting unit 30, a controller 50, and the like. Is done.

The appearance photographing analysis system according to the present invention is provided in a kiosk installed in the field to purchase a used terminal M unattended, and communicates with a central control center (not shown) through an internet communication network to transmit and receive various data. .

The main body 10 provides a dark room 11 in which the used terminal M is placed and blocks external factors in the photographing environment.

In the dark room 11 of the main body 10, the base plate 13 on which the used terminal M is placed is placed across the middle of the dark room 11 in a horizontal direction.

The dark room 11 is a power supply to the camera unit 20 and the illumination unit 30, the used terminal (M) to photograph the upper surface, the lower surface and the side of the used terminal (M) placed on the base plate (13). A cable (not shown) drawn from the controller 50 is provided to control the image displayed on the screen. In addition, the dark room 11 has a mobile unit 40 for moving the position of the used terminal (M) by rotating the base plate 13 or pushing or pulling the used terminal (M), the camera unit to adjust the shooting direction of the camera Another mobile unit 40 for moving the position of 20 may be further provided.

The controller 50 controls the driving of the camera unit 20 and the lighting unit 30 and the like so as to provide an optimal shooting environment in the dark room 11 of the main body 10, and photographed by the camera unit 20. The value is evaluated by analyzing the state of the used terminal (M) through the video.

The controller 50 controls the driving of the camera driving unit 51 for controlling the driving of the camera unit 20, the lighting driving unit 52 for controlling the driving of the lighting unit 30, and the used terminal M. Terminal (M) drive unit 53, the mobile terminal driver (54) for controlling the driving of the mobile unit 40 to adjust the shooting direction by moving the position of the used terminal (M) or the position of the camera is optimal A driving controller which provides a shooting environment of the camera, an image processor 55 for preprocessing and compressing an image captured by the camera unit 20, and an image storage unit 56 for storing the image processed by the image processor 55. And, the image analysis unit 57 for reading and analyzing the image stored in the image storage unit 56, connected to the used terminal (M) by wire or wireless to check the performance of the internal components of the used terminal (M) Performance test unit 61, the test results of the performance test unit 61 and the Artificial intelligence algorithm 58 for evaluating the value of the used terminal (M) using the analysis results of the image analysis unit 57, the communication unit 59 communicates with the central control center. It includes a data deletion module 62 for initializing by deleting the data of the memory of the used terminal (M) purchased through the valuation.

In the artificial intelligence algorithm 58, an evaluation item for evaluating a value is composed of independent items that are not correlated (or few), and each independent item includes several dependent items.

Examples of the classification of the independent items include 'case', 'bezel', 'tempered glass' on the appearance status of the used terminal M, 'display module', 'charge module', 'communication module', Such as "camera",

Examples of subcategories related to 'tempered glass' as independent items may be classified into 'scratch', 'crack', 'broken', and 'gap'.

Each of the independent item and the dependent item is weighted, and the artificial intelligence algorithm evaluates the value of the independent item and the dependent item having a high weight first. Here, the first item to be valued means that the item has a higher weight among items that can be evaluated using the test result obtained from the performance tester or the division result obtained from the image analyzer, and the test result is still an analysis result. It does not mean that the item has a high value of decay, including items that are not obtained and cannot be evaluated.

The value evaluated in each item has a grade, and depending on the grade, the used terminal M is not purchased or the amount deducted from the purchase amount varies.

The weight of each item will have a higher weight of the item that will not be purchased when it is defective, and even if the purchase is made, the item with the larger amount of deduction will be weighted next.

The artificial intelligence algorithm 58 evaluates the value of the used terminal (M) in the order of high weight,

If an item is evaluated that cannot be repaired due to an unrepairable value (i.e. badness) or is too expensive to repair, it will no longer be necessary to stop evaluating other items. Prevent the evaluation from proceeding,

When the dependent items included in the independent item are evaluated in order of weight, the dependent item that is determined to be the maximum deductible amount is obtained, or when the sum of the amounts of the previously evaluated dependent items reaches the maximum amount, the subordinate item is no longer included. By stopping the valuation of dependencies so that they are not unnecessarily evaluated,

The valuation for the purchase of the used terminal (M) is to be made quickly.

If the artificial intelligence algorithm 58 evaluates the defective level of not purchasing while evaluating the value of the item, the controller 50 no longer requires the camera unit 20 to use the used terminal M. Shooting or stopping the performance inspection unit to check the performance of the internal components of the used terminal (M).

In addition, if the artificial intelligence algorithm needs additional data about the item or its related items while evaluating the value of the item, the controller 50 includes the camera unit 20, the lighting unit 30, and the performance tester ( 61), the necessary data (image analysis results, component performance test results) are acquired to facilitate the valuation.

The artificial intelligence algorithm 58 is within the margin of error in determining whether the evaluation item is good or bad, for example, it is not clear whether or not to determine the item as 'good' or 'bad'. If it is not clear which grade should be determined as 'high' or 'intermediate', it is possible to request a court decision by transmitting data (analysis result, inspection result, etc.) related to the central control center through the communication unit 59.

The artificial intelligence algorithm 58 evaluates the other items after requesting a court decision from the control center, and finally evaluates the value of the used terminal M by reflecting the result of the court decision when the control center receives the result. Done. At this time, if the communication is not smooth and fails to send a court request or receives a court result, registration is pending to evaluate the corresponding item, and the related purchase process is performed. With the consent of the seller of the used terminal (M), the seller shall pay the cost in advance to the seller except for the deduction of the item withholding the evaluation, and after the evaluation is completed for the pending item, the amount corresponding to the value of the evaluation is paid to the seller .

The lighting unit 30 may include first to fourth lights 31 to 34, and the camera unit 20 may include first to fourth cameras 21 to 24.

The first to fourth cameras 21 to 24 of the camera unit 20 may be selectively mounted with a wide angle lens, a 1: 1 lens, a macro lens, a telephoto lens, and a pan / tilt / zoom function. It can also be used to shoot with visible lines, use infrared rays, or use both infrared and visible light.

2A, 2B, and 3A, the first light 31 and the first camera 21 illuminate an upper surface of the used terminal M placed in the dark room 11 of the main body 10. Photographing, to analyze the state of the upper surface of the used terminal (M), that is, the damage generated on the upper surface.

Tempered glass is disposed on the upper surface of the terminal M to protect the screen. There is also a terminal (M) provided with a bezel at the edge of the upper surface.

Damage to the tempered glass covering the upper surface of the terminal M may occur, such as scratches and cracks. Tempered glass is an expensive product and is one of the major factors that determine the price (value) of a used terminal (M). So the condition analysis of tempered glass needs to be more precise.

Tempered glass is transparent, so the location and brightness of the light and the camera's shooting angle are very important factors in analyzing the condition.

First, the first camera 21 photographs the upper surface of the used terminal M at an inclined photographing angle between 35 degrees and 60 degrees from the upper portion of the used terminal M. The photographing angle of the first camera 21 is preferably 45 degrees.

Scratch or crack damage caused by transparent tempered glass may or may not be displayed on the image depending on the brightness of the lighting.

Therefore, the first light 31 is composed of LEDs arranged in a grid, and the grid-shaped LEDs have an area that can cover the entire used terminal M.

The LEDs of the first lights 31 arranged in a grid form illuminate the used terminal M in a state where the strings cross each other and are turned off. Here, the lines of LEDs that are alternately lit are horizontal, vertical, and diagonal lines, and the LEDs are also included in the lines of LEDs in the form of circular or other specific shapes. When the LED of the state is moved, you can shoot.

3B, among the LEDs of the first lighting 31, the LEDs that are lit are formed on the upper surface tempered glass of the used terminal. Two pairs of LEDs are lit in four rows in the longitudinal direction, and three rows in the longitudinal direction are extinguished. 12 lines are lit in the width direction, and 11 lines in the width direction are turned off in the width direction.

3b, the LEDs of the first lighting 31 are turned off, and the first camera 21 is photographed. Then, the 12 lines that are turned on in the width direction are turned off, and the 11 lines that are turned off are turned on. In the direction of the light, then turn off the 4 lines that are lit in the longitudinal direction, turn off the 3 lines that are off, and then turn off the 12 lines that are lit in the width direction, and turn off the 11 lines. If you take a picture with the light turned on, you can acquire an image that differs in brightness and whether the LED is lit on the entire surface of the tempered glass, and analyzing this image shows whether the tempered glass has scratches or cracks. Can analyze accurately

The first lighting 31 may use LEDs arranged in one column instead of LEDs arranged in a lattice form. Here, the LEDs are arranged in one row to represent a case in which the LEDs cannot cover the entire upper surface of the used terminal M, which includes two rows and three rows.

In the case of the first lighting 31 in which the LEDs cannot cover the entire upper surface of the used terminal M, when the LED of the first lighting 31 passes the upper part of the used terminal M, the used light is used. The upper surface of the terminal M may have a lit image and an unlit image, and the entire upper surface may be photographed by the first camera 21 in the lit image and the unlit image.

 On the contrary, the first light 31 does not move, the used terminal M moves, the lit image and the unlit image coexist on the upper surface of the used terminal M, and the state of each phase is the first camera 21. Can be taken on.

For reference, when photographing the tempered glass of the used terminal (M), the screen of the terminal (M) is taken in the off state.

2A, 2B, and 4, the second lighting 32 and the second camera 22 illuminate and photograph the side surface of the used terminal M placed in the dark room 11 of the main body 10. To analyze the state of the side of the used terminal (M).

The second lighting 32 and the second camera 22 can analyze whether there is no damage such as scratches, cracks, cracks, and the like generated on the side of the terminal M, and deformation such as bending in the terminal M. .

The second camera 22 photographs the side surface of the used terminal M at an inclined photographing angle between 1 degree and 30 degrees, preferably 5 degrees to 30 degrees, from the upper portion of the used terminal M. More preferred angle is 15 degrees. The second camera 22 may be photographed at the front side of the used terminal M. In this case, the terminal M may be distorted in the image by the angle of view of the camera. Therefore, it is preferable to photograph at an inclined angle between 5 degrees and 30 degrees as above rather than the front side. When using a wide-lens lens to capture a large used terminal (M) at a close distance to the camera to put on one screen, the image of the side of the used terminal can be bent, the angle of the second camera 22 as described above Adjust the to correct the image warping. If you adjust the distance between the used terminal and the camera it may not be necessary to adjust the tilt angle of the camera. The second camera 22 may use a wide-angle lens having a wide angle of view, a 1: 1 lens, a macro lens, a telephoto lens, and a Pan / Tilt / zoom function.

The second lighting 32 illuminates the side surface of the used terminal M in the same direction as the second camera 22. The second lighting 32 may be separately prepared and mounted in the dark room 11, and the LEDs arranged in the edge row may be used as the second lighting 32 in the first lighting 31 in which the LEDs are arranged in a crystal pattern. have.

2a, b and 5, the third light 33 and the third camera 23 illuminate the lower surface of the used terminal M placed in the dark room 11 of the main body 10. Photographing, to analyze the state of the lower surface of the used terminal (M).

The third lighting 33 and the third camera 23 can analyze whether there is no damage such as scratches, cracks, cracks, etc. generated on the side of the terminal (M).

The third camera 23 is disposed below the used terminal M to photograph the lower surface of the terminal M placed on the transparent base plate 13, and the third illumination 33 is used to the used terminal M. The lower surface of the terminal (M) is illuminated from the bottom.

The third camera 23 and the third lighting 33 may be photographed and illuminated in the lower part of the used terminal M, and may be photographed and illuminated in a direction inclined from the bottom.

2a, b and 6, the fourth light 34 and the fourth camera 24 illuminate the upper surface of the used terminal M placed in the dark room 11 of the main body 10. Photographing, to analyze the state of the screen located on the upper surface of the used terminal (M).

The output state of the screen of the terminal M of the fourth light 34 and the fourth camera 24 and the screen may be analyzed for damage such as dirt, aging, burn-in, and the like.

The fourth camera 24 photographs the screen from the upper front of the used terminal (M). The controller 50 allows the image to be displayed on the screen through the terminal driver 53 so that the output state of the screen can be captured and analyzed, and the screen is stained, aged, Shoot and analyze burn-in damage.

The fourth lighting 34 illuminates the lower surface of the lower terminal of the used terminal M to match the color and balance of the screen, thereby improving the quality of the screen for analyzing the state of the screen. In other words, when photographing a screen displayed in white, gray, or black, light on the screen spreads to the surroundings and the boundary of the screen becomes unclear, which may cause an error in image analysis. The fourth light 34 is illuminated at the bottom of the used terminal (M) to prevent this problem by adjusting the white balance.

At this time, instead of the fourth light 34, it may be possible to prevent this problem by placing a black blocking sheet for absorbing light around the used terminal (M) from the mounting plate 13, the used terminal (M) is placed. .

For reference, the black blocking sheet may be helpful when acquiring a higher quality image when the side and bottom surfaces of the used terminal M are photographed and illuminated.

The terminal M analyzes the state by photographing a total of six surfaces of the upper surface, the lower surface, and four sides.

In this case, in consideration of the size of the terminal M and the angle of view of the camera, there are two methods of photographing all six surfaces of the terminal M. FIG. The first method is to move the terminal M to the camera using the mobile unit 40 while minimizing the number of cameras and to shoot all six sides. The second method is to increase the number of cameras while simplifying the mobile unit 40. It's a way to shoot all six sides. Of course, there is also a method of photographing all six surfaces of the terminal M in position without maximizing the number of cameras without using the mobile unit 40.

The first solution provides the environment closest to the human inspection environment, but implements the mechanical mechanism of the mobile unit 40 to variously move and move the direction of the inspection product (that is, the used terminal M) in a specific space. To this end, there is a problem that the size of the entire system is increased, the system configuration price is high, and the implementation of fine adjustment technology for the movement and movement of the mobile unit 40 is difficult.

Therefore, the second method of increasing the number of cameras a little while simplifying the mobile unit 40 may be preferable to the first method.

Referring to FIG. 7A, the camera is used in six photographing directions of four sides (VIEW # 1, # 2, # 3, # 4), lower surface (VIEW # 5), and upper surface (VIEW # 6). You can shoot six sides.

Referring to FIG. 7B, when the camera unit is configured to move the used terminal M forward and backward in a straight line when the angle of view of the camera is small, the camera has four sides (VIEW # 1, # 2, # 3, Six surfaces of the used terminal M may be photographed in six photographing directions of the # 4), the lower surface (VIEW # 5), and the upper surface (VIEW # 6). For reference, in the case where the used terminal M is not front and rear in FIG. 7B, the camera may photograph all six surfaces of the used terminal M only when two photographing directions are added to two sides and one upper and lower side.

Referring to FIG. 7C, when the mobile unit 40 is configured to rotate the used terminal M by 360 degrees, the camera has a side (VIEW # 1), a bottom surface (VIEW # 5), and an upper surface (VIEW # 6). ) You can shoot all six sides of the used terminal (M) with only three shooting directions.

Referring to FIG. 7D, when the mobile unit 40 rotates the used terminal M 360 degrees and moves back and forth in a straight line when the view angle of the camera is small, the camera is viewed from the side (VIEW #). 1), all six surfaces of the used terminal M may be photographed using only three photographing directions of the lower surface VIEW # 5 and the upper surface VIEW # 6.

When the light source (LED is a light source) of the lighting unit 20 directly irradiates the used terminal M, and the camera photographs the light source reflected on the surface of the used terminal M and its surroundings, the light source is positioned in the image. The site cannot be determined. Thus, the camera photographs while the light source in the other position is irradiating the used terminal (M) so that the image is taken without the light source in the quantum where the light source was previously reflected. That is, the lighting unit 20 is provided with a plurality of light sources, the light source is a state in which the part is alternately lit, the camera captures the used terminal (M) to obtain an image.

The camera may be photographed in a state in which the light source is not reflected on the surface of the used terminal M. That is, the light source may be photographed so that the image is not visible. In this case, the used terminal M is scattered according to the illumination angle of the illuminated light. Scattering of the site (usually mainly scattered on the scratched or deformed portion of the used terminal M) is weak enough to not identify it in the image. So, at this time, the illumination unit should be irradiated with light from various angles so that scattering of more than a certain intensity occurs in the scattering portion of the used terminal (M).

As such, when the lighting unit 20 illuminates the used terminal M, a plurality of light sources having different irradiation angles are illuminated at the same time. In this case, when the wavelengths of the light sources are the same, the interference disappears due to the interference of light. Offset interference may occur, resulting in dark or dark bands. Extinction interference and interference fringes make image analysis difficult.

Accordingly, the present invention allows the light sources constituting the lighting unit to have two or more kinds of wavelengths of light (color temperature of light), and the controller 50 changes the used terminal M to a plurality of light sources at the same time. In doing so, the light wavelengths of the lights are different when lighting, thereby preventing the occurrence of light interference.

As the light sources, the color (ie, color temperature and wavelength) of the emitted light is adjusted, and the controller 50 controls the color of the light source to be illuminated at the same time to prevent the interference of light. By using the lighting of the color of the controller, the controller can select the color of the other color as the light source illuminated at the same time to prevent the interference of light.

As a method for preventing interference fringes caused by interference of light, the light source may include a surface light source filter for converting illumination into a surface light source. At this time, the reduction in the amount of light while being switched to the surface light source can be coped with a narrow angle filter for adjusting the light emission angle to the narrow angle. The surface light source filter and the narrow angle filter may be independently provided to the light source, or may be provided together with each other.

FIG. 2C is a front view of the camera unit and the lighting unit, which is good for preventing the interference of light because the camera photographs a state in which the light source is not directly reflected by the used terminal M, and the wavelengths of the light sources are two or more. And a plan view.

Referring to FIG. 2C, the fourth camera 24 photographing the upper surface of the used terminal M and the fifth camera 25 arranging four sides are disposed on the upper side of the main body 10, and the used terminal ( The third camera 23 for photographing the lower surface of M) is disposed, and the fifth lights 35 for illuminating the used terminal M in the lateral direction are disposed on the upper side of the main body 10. The fifth light 35 has a structure in which LEDs are arranged in a line as a light source.

The lighting of the fifth lights 35 and the driving of the fifth cameras 25 are controlled by the controller so that the light sources of the fifth lights 35 are not directly reflected and photographed by the cameras.

The light of the fifth light 35 light source is scattered at the site where there is deformation (crack, crack, scratch, etc.) in the used terminal M, and the third camera 23 and the fifth camera 25 are used terminal M ), The image of the scattered portion of the light source is acquired. Here, the degree of scattering is adjusted according to the angle at which the fifth light 35 irradiates the used terminal M. FIG.

In order to prevent the interference phenomenon, the light source LED of the fifth light 35 simultaneously illuminates the used terminal M with two or more wavelengths in two or more directions. Products made of materials such as glass are characterized by no scattering or weakness when lighting the cracks or broken parts in the vertical direction, and at the same time, irradiating light sources from various directions may cause offset interference due to light interference. . So, to compensate for this, the light source LED of the fifth light 35 illuminates the used terminal M at two or more wavelengths when irradiated at different angles.

In FIG. 2C, when the distance between the light source LED of the used terminal M and the fifth light 35 and the distance between the used terminal M and the fifth camera 25 are the same, the light source of the fifth light 35 ( The angle at which the LED illuminates the used terminal M is preferably 45 degrees or less. In this case, when the area of the used terminal M becomes wider or the distance between the light source and the used terminal M becomes closer, the angle at which the light source LED of the fifth light 35 illuminates the used terminal M is further increased. It is desirable to become small.

2c is not a method in which the light source LED of the fifth light 35 is directly reflected by the used terminal M, and thus the camera 25 is photographed, so that the brightness of the light source can be used strongly. At this time, streaks may fade in the image due to the material characteristics of the used terminal (M). In order to solve this problem, a surface light source filter may be used to convert the surface light source to a light source, and the same light source may be used to increase the efficiency of brightness. A narrow angle filter can be used that makes the angle narrow.

Figure 2c can reduce the number of images acquired for the analysis of the used terminal (M) because the light source (LED) of the fifth light 35 is irradiated and photographed at various angles at the same time, and through the analysis of the image accordingly The value evaluation time of the used terminal M can be shortened.

Preferably, the system according to the present invention can adjust illuminance according to each shooting environment. Accordingly, the illuminance sensor monitors whether the illuminance of the LED light source is irradiated with the set value. The controller senses the illuminance inside the main body 10 by using the illuminance sensor at the initial operation of the system and at a predetermined set period, and controls the amount of light of the lighting unit to maintain the illuminance within the set range when the sensed illuminance is outside the error range. do.

In order to check the performance of the camera unit, the controller of the present invention photographs the inside of the main body 10 at an initial driving time and at a predetermined set period, and checks the state of the camera unit and the shooting environment of the main body, etc., in comparison with the pre-recorded image.

The controller of the present invention guides the seller to remove the attachment of the terminal when the misjudgment due to the attachment attached to the used terminal is expected, and at this time, the misjudgment according to the attachment may also guide the conversion to the postpaid sale.

Among the components constituting the present invention, the camera unit 20 is a relatively expensive component and is a component requiring maintenance or replacement due to a failure.

Therefore, reducing the quantity of the camera unit 20 can reduce the manpower and cost of maintenance costs.

Therefore, the present invention can reduce the number of cameras using the reflection mirror (60).

The reflection mirror 60 is mounted inside the main body so that the second terminal M can be photographed in a direction in which the camera unit 20 does not face (ie, a direction in which the camera unit cannot directly photograph).

In FIG. 8A, one camera photographs six sides of the used terminal M at the same time. In FIG. 8B, one camera photographs five sides of the used terminal M at the same time. In FIG. 8C, one camera uses the used terminal ( An example of a structure for photographing three surfaces of M) at the same time is shown.

As for the appearance of the used terminal (M), the front with tempered glass is most important. Thus, the camera unit 20 is mounted on the upper part of the main body to use the front camera (the fourth camera 24 of Figure 2a can be used as the front camera) to shoot the used terminal M from the front to the front. It may be desirable.

And the reflection mirror 60 is a side mirror 61 to allow the front camera to shoot the side of the used terminal (M) at the same time, and the rear mirror 62 so that the back of the used terminal (M) is taken at the same time. Use

Referring to FIG. 8A, four side mirrors 61 installed on an upper side of the main body 10 on the transparent base plate on which the used terminal M is placed are respectively positioned on the front camera. It provides, and the rear mirror 62 is installed on the lower side relative to the base plate provides the rear side of the used terminal (M) to the front camera. The rear mirror 62 may provide the entire rear surface of the used terminal M using one to four according to size and angle.

Figure 8b shows a structure that can be taken at the same time the front side of the used terminal (M) except for the rear side of the rear camera (62) without using the rear mirror (62), Figure 8c does not use the rear mirror (62) The side mirror 61 shows a structure that the front camera using the two can shoot the front and two sides of the terminal (M) at the same time.

Used terminal (M) varies in size depending on the type. Therefore, even if the type of the used terminal (M) is different, it may be desirable that the reflection mirror 60 can adjust the angle so that the image of the optimal side and the rear surface is projected.

When the collection of the used terminal (M) by the value evaluation and purchase is carried out in the main body 10 can be paid to the seller, but if there is a separate collection box (not shown) to collect the used terminal (M) In the main body 10, the used terminal M and the used terminal (M) stored in the collection box is confirmed that the same terminal (M) pays the purchase price.

The method of checking whether the used terminal M registered for the valuation in the main body 10 and the used terminal M accommodated in a separate collection box are the same.

The used terminal M registered in the main body 10 may be connected to the main body and wired or wirelessly for valuation, and a program for valuation may be installed and remotely controlled. Used terminal (M) stored in the collection box is also connected to the wired or wireless box in order to authenticate the same used terminal (M).

Since the main body 10 and the collection box can capture the unique ID of the used terminal M, which is connected by wire or wireless, respectively, it is possible to authenticate the identity of the used terminal M by comparing the unique ID in the collection box. In this case, the unique ID of the used terminal M may include a MAC address of a hardware, model information, a unique number of a part, a serial number of an installed program, and the like.

In the case of remotely controlling the used terminal M registered in the main body for valuation, the used terminal M stored in the collection box may be remotely controlled. So, through the remote control it is possible to authenticate the identity of the used terminal (M) by a method of recognizing the internal environment of the used terminal (M).

For example, the used terminal (M) to recognize the environmental information through the remote control of the various information lighting, storage path, frequency, sound, and the like output from the collection box. If the environmental information output from the storage box and the environmental information recognized by the used terminal M match, the same used terminal M is authenticated. At this time, the environmental information output from the holder should not be released to the outside of the holder.

To illustrate a specific example,

The lighting is installed inside the collection box to emit light of different colors, one of the lights is turned on, and the camera of the received used terminal M is photographed to check whether the same color is photographed, thereby authenticating the identity. Alternatively, the identity may be authenticated by checking the number of flashes and the number of flashes.

When storing the used terminal (M) in the collection can be authenticated by analyzing the movement of the gyro sensor inside the used terminal (M), such as the request of the incoming terminal (M) is received and inclination, bending.

Speakers installed inside the collection box generates a specific sound (frequency), it can be identified through the microphone of the used terminal (M) to authenticate the identity.

In contrast to the above, the used terminal (M) stored in the collection box displays a specific color on the screen, and the camera installed inside the collection box can shoot the same to authenticate the identity, the used terminal (M) outputs a specific sound (frequency) For example, a microphone placed in a collection box may acquire it and verify identity.

Evaluate the value of the used terminal (M) through the system according to the present invention, after purchasing the used terminal (M) based on this, after deleting the data stored in the memory of the used terminal (M), that is, memory initialization Personal data or personal information of the former owner (ie seller) of the used terminal (M) should not be leaked.

The controller 50 may be provided with a data deletion module 62 so that the personal information of all owners is not leaked through the used terminal M purchased. The data deletion module 62 may be provided in the control center when the data deletion module 62 is installed in the kiosk installed in the field and it is inappropriate to delete data in consideration of cost, security, and the like.

9 is a flowchart illustrating a data deletion method of the terminal M performed by the data deletion module 62.

9, the data deleting method of the terminal M according to the present invention includes a connection step (S10) for accessing the data area of the terminal M, and an encryption step for encrypting the data area of the connected terminal (M). (S20), a deletion step (S30) of deleting the encrypted data area, a random overwriting step (S40) of completely deleting the data of the data area and the initialization step (S50) of proceeding with the factory initialization of the terminal (M) Is done.

Each step will be explained in more detail.

First, the access step (S10) is a step of entering the debugging mode by connecting the terminal (M), generally refers to the step of connecting the data deletion module and the terminal (M) using a separate USB cable.

Debugging mode refers to a mode that outputs detailed information to help detect and correct system errors. It is often called developer mode, and it is difficult to access randomly within mobile device by forcibly connecting PC to mobile device from outside. It can be used to copy data from an area, forcibly install a specific application, or read device information that is not shown in normal user mode.

In order to enter the developer mode again, authentication or confirmation of a user is required, and for this purpose, a process of driving a separate authentication or confirmation procedure is preferably performed.

When the debugging mode is entered in this way, generally, the terminal immediately proceeds to the deletion step S30 of deleting the data area of the terminal M. In this case, recovery is performed through a separate restoration program. The leakage of personal information can be a problem.

Therefore, the present invention further proceeds to the encryption step (S20) applying the encryption technique for the entire data area before the deletion step so that the data cannot be opened even if the data is restored through the restoration program, and then the data through the data restoration program after deletion. Even if it is restored, it is restored as encrypted data, so if there is no encryption code at the time of encryption, the data cannot be restored immediately.

Specifically, first, in order to proceed with the overall deletion process, such as encryption step (S20) and deletion step (S30), first proceeds with the process of driving the confirmation procedure according to whether or not the user's approval and progress as in the debugging mode entry desirable.

When the user's approval is confirmed in the above process, the encryption step S20 of encrypting the data area is performed.

To this end, a general structure of the terminal (M) memory will be described.

Unlike the general desktop PC, the memory of the terminal M is divided into a boot area, a system area, a recovery area, a data area, a cache area, and a Misc area.

The boot area is a space in which a program, resources, data, etc. for booting the terminal M are stored.

The system area is a space in which files related to a system required for driving the terminal M are stored, and refers to a space in which a program or the like installed when the terminal M is produced in a factory is stored.

In general, the recovery area is a space in which a recovery program is stored to return the aforementioned system area to the factory release state when the factory initialization is performed.

The data area is a space in which programs and personal files (contacts, messages, settings), etc., stored by the user, are stored. The data area includes personal information of each user.

In addition, the cache area is a space in which cache data is stored. Here, the cache data is a small high speed memory device which is provided to improve performance. In order to improve access speed by temporarily storing data and instructions between the CPU and the main memory, Refers to automatically archived data.

In addition, the Misc area is used to store information about a carrier or region ID (CID), USB configuration, and specific hardware settings.

Therefore, the encryption step (S20) of the present invention encrypts the data area for each zone of the terminal (M), in particular, by encrypting all data files such as personal information, that is, messages, photos, contacts, photos, certificates, etc. Do not open it arbitrarily.

More specifically, the encrypting step (S20) encrypts both the data area, especially the data area of the internal memory and the data area of the external memory, and encrypts the data area using an encryption code. It will proceed using the 128bit method.

When we talk about AES encryption,

First, in 1975, the National Bureau of Standards enacted an encryption standard called Data Encryption Standard (DES) for data encryption, which uses a 56-bit key. key) As an encryption method, it has been used for a while without any problem, but the key length is too short and the backdoor is included so that it can be decrypted using a special method.

Therefore, as a method developed to solve this problem, AES technology also uses a symmetric key method using the same key for encryption and decryption, but it is possible to process a 128-bit block with a 128-bit, 196-bit, or 256-bit key length. This is the biggest difference from DES.

After encrypting the data area as described above, a deletion step (S30) of deleting the encrypted data area is entered.

Deletion step (S30) refers to the step of deleting all of the aforementioned zone of the terminal (M), that is, the data area, the cache area.

This deletion step (S30) is to erase the record in the file system, there is a problem that can be easily restored using a restore program, not to actually find the file and delete the file.

Therefore, after the present invention goes through such an erasing step (S30), the present invention goes through the random overwriting step (S40) once more to delete the more complete data area.

The random overwriting step (S40) means permanent deletion, which is different from general deletion. The zero-fill method of recording the entire area of data as 0 or 1 and the entire area of the data are recorded as non-overlapping characters. There is an infinite random input method to remove data.

The present invention does not follow the simple method of the operating system, deletes the record of the file system, moves to the actual file space recorded in the data area, and writes new data on the file, that is, zero or one or non-redundant characters. Random overwrite is done with.

In general, the data deletion method uses a standard method (DOD 5220.22-M) recommended by the US Department of Defense or the National Intelligence Service for storage media such as a HDD of a PC, and generally overwrite three times or more. On the other hand, mobile devices use flash memory as a storage device unlike a storage medium such as a HDD in a PC. In the case of a flash memory, direct data can not be overwritten. The data is deleted completely. However, in the case of flash memory, overwriting this method takes a long time and has a side effect of shortening the memory life.It is known that data can be completely erased even if only one overwriting is performed. It is a common trend. However, the data recovery technology has been developed along with the deletion method, and there is a problem in that data can not be completely deleted with a simple zero fill. Recovery technology is also developing, such as using H / W, which is not expected to be completely deleted.

Therefore, in the present invention, not only the zero-fill method for recording data as 0 or 1, but also the infinite random number input method for inputting characters that do not overlap with each other according to the state of the terminal M can be completely deleted. Make it work,

As an additional security measure, as described above, the present invention performs encryption before the random overwrite step (S40), so that even if the personal information is recovered, the encrypted file is recovered, thereby making it impossible to view the personal information. It has a feature to protect personal information.

In the random overwriting step (S40), the present invention uses a mixture of an infinite random number input method and a zero-fill method in order to protect personal information more safely, and is processed in a parallel process for faster processing.

More specifically with reference to FIG. 9.

First, the random overwrite step (S40) checks whether the capacity of the memory data area is larger than the reference capacity (for example, 100M) (S41).

As a result of the check, if the data area is smaller than the reference capacity, the data is completely deleted by the infinite random number input method, the zero fill method, or a mixed method for the entire data area (S42).

As a result of the check, if the data area is larger than the reference capacity, the data area is sequentially divided into sectors S45 having a dividing capacity (for example, 280M) (S43). The sectors S45 may be divided physically and logically so as not to influence each other.

When partitioning of the first sector in the data area is completed, data is completely deleted in a manner that is a mixture of infinite random number input method and zero-fill method for the first sector, and data is immediately deleted when data is completely deleted for the first sector. The division of the second sector is started in the remainder of the area. When the division of the second sector is completed, the data is completely deleted, and the division of the third sector is started again.

Therefore, the random overwrite step S40 is processed in a parallel process method in which data is completely deleted for the plurality of sectors S45 divided in the data area at the same time, thereby shortening the data erasure time for the entire data area. .

In the method of completely deleting the data in the divided sector (S45), the data is completely deleted by the infinite random number input method for a part of the divided sector (for example, 90M of 280M) (S46), and a part of the rest (for example, 190M). (280-90)) a method of completely erasing the data by the zero-fill method for a part (100M) (S47), and completely deleting the data by the infinite random number input method (S48) for the remaining (for example, 90M) Can be used.

The terminal (M), which has undergone the random overwriting step (S40), goes through an initialization step (S50) of proceeding with a factory initialization for reuse, thereby completely deleting the data of the terminal (M) that has been left. In case of attempting restoration for criminal offenses, it is possible to strengthen the supplementation by not being able to open it as the restored data is encrypted.

In the above description of the present invention, the appearance photographing analysis system for evaluating the value of the used terminal having a specific shape and structure with reference to the accompanying drawings, and a method of deleting data of the terminal performed by a specific procedure have been described. Various modifications and variations are possible to those skilled in the art, and such variations and modifications should be construed as falling within the protection scope of the present invention.

10: body 11: dark room
13: Seating plate 20 (21 ~ 24): Camera unit
30 (31 ~ 34): lighting unit 40: mobile unit
50: controller 51: camera driver
52: lighting driving unit 53: terminal driving unit
54: moving unit driving unit 55: image processing unit
56: image storage unit 57: image analysis unit
60: reflective mirror 61: side mirror
62: rear mirror

Claims (3)

Connecting to enter a debugging mode by connecting a terminal;
Encrypting a data area of the terminal memory;
A deleting step of deleting the encrypted data area;
A random overwriting step of completely deleting data by writing a character in the data area;
In the initializing step of initializing the terminal to which the data area is deleted;

The random overwrite step
Infinite random number input method for removing all data by writing with characters not overlapping each other in the data area, and zero-fill method for recording as 0 or 1 in another part of the data area are mixed. How to delete. The method of claim 1,
The random overwrite step
A terminal characterized by dividing a data area into sectors having a dividing capacity and completely deleting data in the divided random sectors by the infinite random input method and the zero-fill method, and simultaneously processing a plurality of sectors in a parallel process. How to delete your data. The method according to claim 1 or 2,
The encrypting step encrypts the cache area of the terminal memory.

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