TWI791151B - Data automatic deletion method and system thereof - Google Patents

Abstract

The present invention relates to a method and system for automatically deleting data, which includes a host device and an external device, the host device executes an application program and establishes a connection state with the external device, and when the host device uses the external device When there is a first data, the host device generates a second data associated with the first data in the host device according to the first data, and when the host device determines that the connection status with the external device is interrupted, The host device deletes the second data in the host device. In this way, it not only reduces the risk of data leakage, but also facilitates the storage and management of data, so as to achieve the purpose of improving the security of data storage and the convenience of use.

Description

Data automatic deletion method and system thereof

The present invention relates to a method and system for automatically deleting data, in particular to a method and system for automatically deleting data when the connection between devices is interrupted.

Nowadays, people are accustomed to storing data in a portable external device, such as a USB flash drive, SD memory card, portable hard drive, or a mobile device that can be used as a flash drive, so that the data can be easily carried and used anywhere.

When the user needs to use the data stored in the external device, he will connect the external device with a computer host, and read the data in the external device through the computer host. And when the user reads the data in the external device through the computer host, there will be a temporary file or record file related to the data in the computer host. In addition, in order to efficiently execute the data in the external device in the computer device, the user often copies or transfers the data from the external device to the computer host.

However, when the data is used up, the user tends to forget to delete the data related to the external device stored in the host computer, which makes the data easily used by unscrupulous people.

And as Chinese people's awareness of personal information protection is gradually increasing, how to ensure that the data in the external device is not left on the public computer and reduce the risk of the data in the external device from being leaked will inevitably become an important research and development direction.

In view of the problem in the above-mentioned prior art that when the external device is removed from the host computer, the user tends to forget to delete the data related to the external device in the host computer device, causing the data to be used maliciously by unscrupulous persons, the present invention The main purpose of the present invention is to provide a method and system for automatically deleting data. When a host device detects that the connection status with an external device is interrupted, the host device automatically deletes the data related to the external device, thereby protecting the data. Do not leak.

A technical means adopted in order to achieve the above purpose is to make the above-mentioned data automatically delete method, which includes the following steps: the host device executes an application program and establishes a connection state with the external device; when the host device uses the external device When there is a first data, the host device generates a second data related to the first data in the host device according to the first data; when the host device judges that the connection status with the external device is interrupted, the host device The second data in the host device is deleted.

In addition, another technical means adopted to achieve the above purpose is to make the aforementioned data automatic deletion system, including: a host device; and an external device connected to the host device; wherein, the host device executes an application program and the external device The device establishes a connection state; when the host device uses a first data in the external device, the host device generates a second data related to the first data in the host device according to the first data; when the When the host device determines that the connection status with the external device is interrupted, the host device deletes the second data in the host device.

In the present invention, when the host device judges that the connection state with the external device is interrupted, the host device deletes the second data corresponding to the first data stored in the host device, so as to prevent the user from forgetting to delete the data. , causing problems such as data being used and stolen by interested people, so as to improve the security of data storage and the convenience of data use.

10: External device

11: The first communication unit

12: Control unit

13: The first storage unit

20: host device

21: The second communication unit

22: Processing unit

23: Second storage unit

S201~S204, S301~S306, S501~S510, S701~S712: steps

FIG. 1 is a block diagram of the system architecture of a preferred embodiment of the present invention.

Fig. 2 is a flow chart of the method of the preferred embodiment of the present invention.

Fig. 3 is a flow chart of the method of the preferred embodiment of the present invention.

4A and 4B are schematic block diagrams of a preferred embodiment of the present invention.

5A and 5B are method flowcharts of a preferred embodiment of the present invention.

6A and 6B are schematic block diagrams of a preferred embodiment of the present invention.

FIG. 7A and FIG. 7B are method flowcharts of a preferred embodiment of the present invention.

8A and 8B are schematic block diagrams of a preferred embodiment of the present invention.

Regarding the preferred embodiment of the automatic data deletion system of the present invention, please refer to FIG. 1, which includes an external device 10 and a host device 20. The external device 10 uses hot plugging or wireless communication such as: Wi-Fi, Bluetooth Buds (Bluetooth), etc., are connected to the host device 20, wherein, when the external device 10 is connected to the host device 20, the host device 20 executes an application program to establish a connection state with the external device 10, when the external When the device 10 is removed (unplugged) from the host device 20, the connection state is interrupted. In this embodiment, the external device 10 can be a USB flash drive, a memory card, an OTG flash drive, a mobile device used as an OTG flash drive, a wireless flash drive and other external devices with the function of storing data; The host device 20 may be a computer device.

The external device 10 includes a first communication unit 11, a control unit 12 and a first storage unit 13, the control unit 12 is connected to the first communication unit 11 and the first storage unit 13, the first communication unit 11 and the first storage unit 13 The host device 20 is connected in communication, the control unit 12 is used for processing information, the first The storage unit 13 stores more than one piece of first data. The first communication unit 11 can be a Universal Serial Bus (USB) or support wireless communication interfaces such as Wi-Fi and Bluetooth. The control unit 12 can be a smart wafer.

The host device 20 includes a second communication unit 21, a processing unit 22 and a second storage unit 23, the processing unit 22 is connected to the second communication unit 21 and the second storage unit 23, the second communication unit 21 and the second storage unit 23 The first communication unit 11 is connected in communication, the processing unit 22 processes the received information and executes related application programs, the second storage unit 23 stores data, and the second communication unit 21 can be a Universal Serial Bus (Universal Serial Bus) Bus, USB) or support wireless communication interfaces such as Wi-Fi and Bluetooth. Specifically, the second communication unit 12 can be connected to the first communication unit 11 by hot plugging or wireless communication such as Wi-Fi and Bluetooth. .

In use, the automatic data deletion method of the present invention is executed by the automatic data deletion system. Please also refer to FIG. Establish a connection state with the external device 10 (S201); when the host device 20 uses the first data in the external device 10, the host device 20 generates the first data in the host device 20 according to the first data Related to a second data (S202); the host device 20 judges whether the connection status with the external device 10 is interrupted (S203), and when the host device 20 judges that the connection status with the external device 10 is interrupted, the host device The device 20 deletes the second data in the host device 20 (S204).

In this embodiment, the step of using the first data in the external device 10 by the host device 20 includes reading, copying or saving the first data in the external device 10 by the host device 20 .

In this way, when the host device 20 determines that the connection status with the external device 10 is interrupted, the host device 20 will store the second data corresponding to the first data stored in the host device 20. Data deletion, to avoid problems such as data being used and stolen by malicious people due to users forgetting to delete data, so as to improve the security of data storage and the convenience of data use.

Further, please refer to FIG. 3 , the external device 10 pre-stores an identification table, and the identification table records at least one identification comparison information. When the user plugs the external device 10 into the host device 20 in a hot-swappable manner, and connects the first communication unit 11 to the second communication unit 21, the user makes the host device 20 execute the application through operation. program. When the processing unit 22 of the host device 20 executes the application program, the processing unit 22 of the host device 20 sends an identification information to the first communication unit 11 of the external device 10 through the second communication unit 21 (S301 ), and the control unit 12 of the external device 10 determines whether the received identification information is the same as the identification comparison information in the identification table according to the identification information (S302). When the control unit 12 of the external device 10 determines that the identification comparison information is the same as the identification information, the external device 10 establishes a connection state with the host device 20 (S303). As shown in FIG. 4A, when the user needs to use the first data in the first storage unit 13, the processing unit 22 of the host device 20 generates the first data in the host device 20 according to the first data. A related second data (S304) is stored in the second storage unit 23, and the processing unit 22 of the host device 20 determines whether the connection status with the external device 10 is interrupted (S305). As shown in FIG. 4B, when the processing unit 22 of the host device 20 determines that the connection status with the external device 10 is interrupted, the processing unit 22 of the host device 20 deletes the second data in the host device 20 ( S306). In this embodiment, the application program can be pre-installed in the host device 20, or the application program can be stored in the external device 10, when the external device 10 is connected to the host device 20, the external device 10 will send the application program to the host device 20 for installation.

In this embodiment, the second data includes at least one of a temporary file of the first data, a copy file of the first data, or an edited file of the first data.

Further, the second storage unit 23 of the host device 20 also stores a data record table, and when the host device 20 generates the second data, the application program of the host device 20 records An address information of the second data is stored in the data record table. And when the host device 20 judges that the connection status of the external device is interrupted, the application program of the host device 20 deletes the second data according to the address information in the data record table. In this embodiment, the data record table records the name, address, creation time and other information of the second data.

For example, when the user uses the first data of the external device 10 through the host device 20, the application program of the host device 20 will record the path address where the second data is stored in the second storage unit 23 , that is, the address information (as shown in Table 2), so when the connection between the external device 10 and the host device 20 is interrupted, the host device 20 can delete the second data according to the address information.

Further, when the host device 20 generates the second data, the application program of the host device 20 gives the second data a mark. When the host device 20 determines that the connection status with the external device 10 is interrupted, the application program of the host device 20 searches for the second data in the host device 20 according to the flag and deletes the second data.

That is to say, when the host device 20 generates the second data, the application program of the host device 20 can directly record the address information of the second data, or give the second data the mark for the current When the connection between the host device 20 and the external device 10 is interrupted, the application program of the host device 20 can find the second data in the host device 20 according to the address information or the tag, and delete it.

Further, please refer to FIG. 5A and FIG. 5B , since the external device 10 and the host device 20 may be used by different users at the same time, in order to effectively distinguish different users from using the host device 20 in the external device 10 The authority of the first data, the first data of the external device 10 is provided with a first confidentiality level, and the identification table of the external device 10 further records a use authority level corresponding to the identification comparison information, as shown in Table 1 . In this embodiment, the identification comparison information of the external device 10 includes an identification code, a password or a computer identification data, and the identification information sent by the host device 20 The information includes a user account and a password, or a computer identification code, such as: computer name, globally unique identifier (GUID) or universally unique identifier (UUID).

For example, the external device 10 can determine whether the user account number and password in the received identification information are the same as the identification code and password in the identification comparison information, thereby confirming the identification information and the identification comparison information Whether they are the same, and the user account number and the password in the identification information may be input by the user through the application program operating the host device 20, and the host device 20 will send the identification information entered by the user to The external device 10 . Or the identification information only has a computer identification code, and the identification code in the identification comparison information is computer identification data, the external device 10 can use the computer identification code in the identification information and the identification comparison information determine whether the identification information is the same as the identification comparison information. Since the computer identification code and the computer identification data can be a long string of garbled characters, GUID, or UUID, it is not easy to be stolen by others and still has considerable confidentiality, so the computer identification code and computer identification data are compared , there is no need to set another password for comparison and verification.

When the host device 20 executes the application program, the host device 20 sends the identification information to the external device 10 (S501), for the external device 10 to determine whether the identification information is the same as the identification comparison information (S502). When the external device 10 judges that the identification comparison information is the same as the identification information, the external device 10 grants the host device 20 the identification comparison information that is the same as the identification information. The usage authority level (S503), and the host device 20 establishes a connection state with the external device 10 (S504). When the user needs to use the first data in the first storage unit 13, the host device 20 requests the external device 10 to use the first data (S505), and the external device 10 determines the first data of the first data. Whether the confidentiality level is lower than the usage authority level (S506). When the external device 10 judges that the first confidentiality level is lower than the usage authority level, the external device 10 allows the host device 20 to use the first data (S507), and the host device 20 uses the first data according to the permitted use. Generate second data related to the permitted first data in the host device 20 (S508), and the host device 20 determines whether the connection status with the external device 10 is interrupted (S509). When the processing unit 22 of the host device 20 determines that the connection status with the external device 10 is interrupted, the host device 20 deletes the second data in the host device 20 (S510).

For example, as shown in Table 1 and FIG. 6A, if the user account in the identification information of the host device 20 is User456 and the password is 456, then the external device 10 can determine the same identification as the identification information according to the identification table. The usage authority level corresponding to the comparison information is 3, and there are a plurality of first data stored in the first storage unit of the external device 10, which are respectively: a first data a, and the set first confidentiality level is LV1; For data b, the first confidentiality level is LV2; for first data c, the first confidentiality level is LV3; for first data d, the first confidentiality level is LV4; therefore, the external device 10 judges the Only the first data a and the first data b have a first confidentiality level lower than the usage authority level, and the external device 10 only allows the host device 20 to use the first data a and the first data b. Therefore, the host device 20 can only generate a corresponding second data a and a second data b in the host device 20 according to the first data a and the first data b. And as shown in FIG. 6B, when the processing unit 22 of the host device 20 judges that the connection status with the external device 10 is interrupted, the host device 20 deletes the second data a and the second data in the host device 20. b.

Further, please refer to FIGS. 7A and 7B , the first data is provided with the first confidentiality level, and the host device 20 presets a data retention level. When the host device 20 generates the second data When data is provided, the application program of the host device 20 gives the second data a second confidentiality level, the second confidentiality level is the same as the first confidentiality level of the first data, and the second confidentiality level is recorded in the data record table, as shown in Table 2. When the host device 20 determines that the connection with the external device 10 is interrupted, and when the application program of the host device 20 determines that the second confidentiality level is higher than the data retention level, the application program of the host device 20 deletes the second confidentiality level. Second data, otherwise, the second data will not be deleted.

That is to say, when the host device 20 executes the application program, the host device 20 sends the identification information to the external device 10 (S701), for the external device 10 to determine whether the identification information is the same as the identification comparison information ( S702). When the external device 10 determines that the identification comparison information is the same as the identification information, the external device 10 grants the host device 20 the use authority level corresponding to the identification comparison information that is the same as the identification information (S703), and the The host device 20 establishes a connection state with the external device 10 (S704). When the user needs to use the first data in the first storage unit 13, the host device 20 requests the external device 10 to use the first data (S705), and the external device 10 determines the first data of the first data. Whether the confidentiality level is lower than the usage authority level (S706). When the external device 10 judges that the first confidentiality level is lower than the usage authority level, the external device 10 allows the host device 20 to use the first data (S707), and the host device 20 uses the permitted first data in the The host device 20 generates second data related to the allowed first data (S708), and the host device 20 determines whether the connection status with the external device 10 is interrupted (S709).

Further, when the processing unit 22 of the host device 20 determines that the connection status with the external device 10 is interrupted, the host device 20 determines whether the second confidentiality level of the second data is higher than the data retention level (S710) . When the second confidentiality level of the second data is higher than the data retention level, the host device 20 deletes the second data in the host device 20 (S711). On the contrary, when the second confidentiality level of the second data is not higher than the data retention level, the host device 20 does not delete the second data (S712).

For example, as shown in Table 1, Table 2 and FIG. 8A, if the default data retention level of the host device 20 is 3, and the user account in the identification information of the host device 20 is User123, and the password is 123, Then the external device 10 can judge according to the identification table that the use authority level corresponding to the identification comparison information identical to the identification information is LV4, and the first storage unit of the external device 10 stores the first data a, the first data b, the first data c and the first data d. Therefore, the external device 10 judges that the first data a, the first data b, the first data c, and the first data d have the first confidentiality level lower than the authorization level, and the external device 10 allows The host device 20 uses the first data a, the first data b, the first data c and the first data d. Therefore, the host device 20 can generate the corresponding second data a, the second data b. The second data c and the second data d, and the second data confidentiality levels of the second data a, the second data b, the second data c and the second data d are respectively the same as the first data a. The first confidentiality levels of the first data b, the first data c, and the first data d are the same, which are LV1, LV2, LV3, and LV4, respectively.

And as shown in FIG. 8B, when the processing unit 22 of the host device 20 determines that the connection status with the external device 10 is interrupted, the host device 20 determines that the second confidentiality level of the second data is higher than that of the data retention level. There is only the second data d, therefore, the host device 20 only deletes the second data d in the host device 20, and does not delete the second data whose second confidentiality level is not higher than the data retention level. Two data a, the second data b and the second data c.

To sum up, the data automatic deletion method and system provided by the present invention, when connecting the external device to the host device to use the data of the external device, there is no need to worry about the important data of the external device being left on the host device and causing data outflow. Trends in the regulation of important data storage in various countries, in particular, the right to be forgotten under the EU General Data Protection Regulation (GDPR). In one embodiment, the security level of the connection and data usage can be increased by granting the use authority level to the identification information and establishing the connection status between the host device and the external device. In one embodiment, it is possible to determine whether relevant data in the host device should be retained or not based on the data confidentiality level and the data retention level of the host device, and only delete data with a higher confidentiality level while retaining data with a lower confidentiality, increasing the risk of data deletion and retention. elasticity.

But the above-mentioned ones are only embodiments of the present invention, and should not limit the scope of the present invention. All simple equivalent changes and modifications made according to the patent scope of the present invention and the content of the patent specification are still within the scope of this invention. within the scope of invention patents.

10: External device

11: The first communication unit

12: Control unit

13: The first storage unit

20: host device

21: The second communication unit

22: Processing unit

23: Second storage unit

Claims (10)

A method for automatically deleting data, comprising the following steps: a host device executes an application program to establish a connection state with an external device; when the host device uses a first data in the external device, the host device A second data related to the first data is generated in the host device; when the host device judges that the connection state with the external device is interrupted, the host device deletes the second data in the host device. The method for automatically deleting data as described in claim 1, wherein the external device pre-stores an identification table, and the identification table records at least one identification comparison information; wherein, when the host device executes the application program, the host device sends a The identification information is sent to the external device, and when the external device determines that the identification comparison information is the same as the identification information, the external device establishes a connection state with the host device. The method for automatically deleting data as described in claim 2, wherein the first data is provided with a first confidentiality level, and the identification table further records a usage authority level corresponding to the identification comparison information; wherein, when the external device judges When the identification comparison information is the same as the identification information, the external device grants the host device the use authority level corresponding to the identification comparison information that is the same as the identification information; wherein, when the external device determines that the first confidentiality level is higher than When the usage authority level is low, the external device allows the host device to use the first data. The method for automatically deleting data as described in claim 1, wherein the host device stores a data record table; wherein, when the host device generates the second data, the application program of the host device records a part of the second data address information into the data record table; Wherein, when the host device determines that the connection status with the external device is interrupted, the application program of the host device deletes the second data according to the address information in the data record table. The method for automatically deleting data as described in claim 1, wherein, when the host device generates the second data, the application program of the host device gives a mark to the second data; wherein, when the host device judges that the external When the connection state of the device is interrupted, the application program of the host device searches for the second data in the host device according to the mark and deletes the second data. The method for automatically deleting data as described in claim 4 or 5, wherein the first data is provided with a first confidentiality level, and the host device presets a data retention level; wherein, when the host device generates the second data , the application program of the host device gives the second data a second confidentiality level, and the second confidentiality level is the same as the first confidentiality level of the first data; wherein, when the host device determines that the connection with the external device interrupt, and when the application program of the host device determines that the second confidentiality level is higher than the data retention level, the application program of the host device deletes the second data. The method for automatically deleting data as described in Claim 1, wherein the step of using the first data in the external device by the host device includes reading, copying or saving the first data in the external device by the host device. The method for automatically deleting data as described in any one of claims 1 to 5 and 7, wherein the second data includes a temporary file of the first data, a copy file of the first data, or an edited file of the first data At least one file. The method for automatically deleting data as described in Claim 6, wherein the second data includes at least one of a temporary file of the first data, a copy file of the first data, or an edited file of the first data. An automatic data deletion system, including: A host device and an external device; wherein, the host device and the external device execute the method for automatically deleting data as described in any one of claims 1-9.

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