CN110765499A - Data processing method of encrypted USB flash disk - Google Patents
Data processing method of encrypted USB flash disk Download PDFInfo
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- CN110765499A CN110765499A CN201810850459.9A CN201810850459A CN110765499A CN 110765499 A CN110765499 A CN 110765499A CN 201810850459 A CN201810850459 A CN 201810850459A CN 110765499 A CN110765499 A CN 110765499A
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/70—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer
- G06F21/78—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure storage of data
- G06F21/79—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure storage of data in semiconductor storage media, e.g. directly-addressable memories
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Abstract
The invention discloses a data processing method of an encrypted USB flash disk, which comprises the following steps: step S1: the USB flash disk is accessed to an external host; step S2: the host sends an instruction to the USB flash disk; step S3: the USB flash disk acquires and analyzes the instruction sent by the host computer and then executes corresponding operation; step S4: and feeding back a message to the host after the operation is completed. By adopting the technical scheme of the invention, an encryption card storage area is opened up in the storage module, the encryption and decryption functions of a common hard disk in an external host are realized by adopting a standard storage interface and a standard protocol, and the encryption and decryption operation functions are completely encapsulated in the storage protocol.
Description
Technical Field
The invention relates to the technical field of data security, in particular to a data processing method of an encrypted USB flash disk.
Background
Conventionally, data security of computers has been concerned, and various storage disks having an encryption function, such as an encrypted memory card, an encrypted usb disk, and an encrypted hard disk, have been introduced in the market. However, when the encrypted usb disk in the prior art is accessed to an external host, it is only used as an encrypted storage device, and cannot provide an encrypted storage or data decryption function for a general storage hard disk in the host, which causes inconvenience when a user mixedly uses the encrypted storage disk in a general computer (non-encrypted hard disk).
Therefore, it is necessary to provide a technical solution to solve the technical problems of the prior art.
Disclosure of Invention
In view of the above, it is necessary to provide a data processing method for an encrypted usb disk, which creates an encrypted card storage area in a storage module and uses a standard storage interface and protocol to implement the encryption and decryption functions on a common storage hard disk when accessing an external host, and at the same time, the encryption and decryption functions of the encrypted usb disk on the common storage hard disk in the host are completely encapsulated in the storage protocol, so that the encryption and decryption tasks can be distributed and obtained through a storage instruction, and the requirement of a user on a common computer for mixed use of the encrypted storage disk is met.
In order to overcome the defects of the prior art, the technical scheme of the invention is as follows:
a data processing method of an encrypted USB flash disk comprises the following steps:
step S1: the USB flash disk is accessed to an external host;
step S2: the host sends an instruction to the USB flash disk;
step S3: the USB flash disk acquires and analyzes the instruction sent by the host computer and then executes corresponding operation;
step S4: feeding back a message to the host after the operation is finished;
the USB flash disk at least comprises a USB interface, a controller, a data encryption and decryption unit and a storage module, wherein the data encryption and decryption unit at least comprises an encryption processing unit, a decryption processing unit and a secret key storage unit, and the encryption processing unit is used for executing data encryption operation; the decryption processing unit is used for executing data decryption operation; the key storage unit is used for storing a key;
the storage module comprises a data storage area and an encryption card storage area, and the data storage area is used for normal data storage of the USB flash disk;
the encryption card storage area is further provided with an encryption storage unit and a decryption storage unit, and the encryption storage unit and the decryption storage unit are respectively provided with a plurality of storage units which are respectively used for storing data after encryption operation or decryption operation is executed;
the controller is connected with the data encryption and decryption unit and the USB interface and is used for acquiring the instruction sent by the host computer, analyzing the instruction and executing corresponding processing;
in step S3, when the obtained instruction is a write instruction and the write address is a data storage area, the controller sends the task to be processed to the data encryption and decryption unit, and stores the task in the data storage area after being encrypted by the encryption processing unit;
when the obtained instruction is a write instruction and the write address is an encryption storage unit, the controller sends the task to be processed to the data encryption and decryption unit, and the task to be processed is directly stored in the corresponding storage unit after being encrypted by the encryption processing unit; when the obtained instruction is a write instruction and the write address is a decryption storage unit, the controller sends the task to be processed to the data encryption and decryption unit, and the task to be processed is directly stored in the corresponding storage unit after being decrypted by the decryption processing unit;
in step S4, after the write command is executed and the address is the encrypted card storage area, the controller feeds back a task completion message to the host, where the task completion message at least includes address information of a storage unit corresponding to the task;
when the obtained instruction is a read instruction and the address is a data storage area, the controller reads data information corresponding to the address and sends the data information to the data encryption and decryption unit, and the data information is decrypted by the decryption processing unit and then sent to the host;
when the obtained command is a read command and the address is the storage area of the encryption card, the controller directly reads the data information of the storage unit corresponding to the address and sends the data information to the host.
As a preferred technical solution, the usb disk further includes a random number generator and an algorithm storage unit, wherein the random number generator is used for generating a random number under the control of the controller as a key for data encryption and decryption operations;
the algorithm storage unit is connected with the controller and the data encryption and decryption unit and is used for storing the algorithm of data encryption and decryption.
As a preferred technical solution, the method further includes the step of obtaining a configuration instruction sent by the host, where the configuration instruction is used to configure the encryption and decryption parameters of the encryption and decryption engine; and the data encryption and decryption unit selects a corresponding encryption and decryption algorithm according to the configuration parameters.
As a preferred technical solution, the encryption and decryption engine further comprises an algorithm storage unit, and the algorithm for encrypting and decrypting data in the algorithm storage unit is at least any one of AES-128/256, SM2, SM3, SM4, RSA, 3DES, or SHA.
As a preferred technical solution, the data encryption device further comprises a data buffer, and the data buffer is connected with the controller, the USB interface, the data encryption and decryption unit, and the storage module, and is used for caching data.
As a preferred technical scheme, the encryption card storage area adopts a plurality of eMMC chips, and the plurality of eMMC chips are cascaded through a bus.
As a preferred technical scheme, when the controller executes write operation and the address is the encryption card storage area, selecting an idle storage unit and sending the address information and the task to be processed to the data encryption and decryption unit; and the data encryption and decryption unit directly stores the processed tasks into the storage unit after executing encryption and decryption operations.
As a preferred technical solution, the controller sets a data storage mapping table, and the data storage mapping table is used for recording the stored information, the algorithm adopted by the stored information, and the corresponding address of the stored information.
As a preferred technical scheme, the controller sets an encryption card memory mapping table, and the encryption card memory mapping table is used for recording the addresses of each task and the corresponding memory unit.
As a preferred technical solution, the encryption card memory mapping table further sets a memory flag bit, where the memory flag bit is used to identify a read-write state of data in a memory unit, and the data in the memory unit is read out and then the memory space is released for subsequent write-in operation.
As a preferred technical scheme, the U disk is provided with a plurality of data encryption and decryption units, and each data encryption and decryption unit has an ID with a unique identifier.
Compared with the prior art, the USB flash disk opens up an encryption card storage area in the storage module, adopts a standard storage interface and a standard protocol to realize the data encryption and decryption functions of a common hard disk in an external host, completely encapsulates the encryption and decryption operation functions in the storage protocol, realizes the distribution and acquisition of encryption and decryption tasks through storage instructions, and greatly meets the requirement of mixed use of the encryption storage disk in a common computer (a non-encryption hard disk).
Drawings
FIG. 1 is a schematic block diagram of a USB flash disk according to the present invention.
FIG. 2 is a schematic diagram of an encrypted card storage area in the present invention.
Fig. 3 is a schematic block diagram of another embodiment of the usb flash disk according to the present invention.
Fig. 4 is a flow chart of a data encryption and decryption method of the usb disk according to the present invention.
The following specific embodiments will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
The technical solution provided by the present invention will be further explained with reference to the accompanying drawings.
Referring to fig. 4, a flow chart of the data processing method of the encrypted usb disk of the present invention is shown, which includes the following steps:
step S1: the USB flash disk is accessed to an external host;
step S2: the host sends an instruction to the USB flash disk;
step S3: the USB flash disk acquires and analyzes the instruction sent by the host computer and then executes corresponding operation;
step S4: feeding back a message to the host after the operation is finished;
the USB flash disk at least comprises a USB interface, a controller, a data encryption and decryption unit and a storage module, wherein the data encryption and decryption unit at least comprises an encryption processing unit, a decryption processing unit and a secret key storage unit, and the encryption processing unit is used for executing data encryption operation; the decryption processing unit is used for executing data decryption operation; the key storage unit is used for storing a key;
the storage module comprises a data storage area and an encryption card storage area, and the data storage area is used for normal data storage of the USB flash disk;
the encryption card storage area is further provided with an encryption storage unit and a decryption storage unit, and the encryption storage unit and the decryption storage unit are respectively provided with a plurality of storage units which are respectively used for storing data after encryption operation or decryption operation is executed;
the controller is connected with the data encryption and decryption unit and the USB interface and is used for acquiring the instruction sent by the host computer, analyzing the instruction and executing corresponding processing;
in step S3, when the obtained instruction is a write instruction and the write address is a data storage area, the controller sends the task to be processed to the data encryption and decryption unit, and stores the task in the data storage area after being encrypted by the encryption processing unit;
when the obtained instruction is a write instruction and the write address is an encryption storage unit, the controller sends the task to be processed to the data encryption and decryption unit, and the task to be processed is directly stored in the corresponding storage unit after being encrypted by the encryption processing unit; when the obtained instruction is a write instruction and the write address is a decryption storage unit, the controller sends the task to be processed to the data encryption and decryption unit, and the task to be processed is directly stored in the corresponding storage unit after being decrypted by the decryption processing unit;
in step S4, after the write command is executed and the address is the encrypted card storage area, the controller feeds back a task completion message to the host, where the task completion message at least includes address information of a storage unit corresponding to the task;
when the obtained instruction is a read instruction and the address is a data storage area, the controller reads data information corresponding to the address and sends the data information to the data encryption and decryption unit, and the data information is decrypted by the decryption processing unit and then sent to the host;
when the obtained command is a read command and the address is the storage area of the encryption card, the controller directly reads the data information of the storage unit corresponding to the address and sends the data information to the host.
Referring to fig. 1, a schematic block diagram of an encrypted USB disk according to the present invention is shown, and the encrypted USB disk at least includes a USB interface, a controller, a random number generator, an algorithm storage unit, a data encryption/decryption unit, and a storage module, where the USB interface is used for accessing an external host.
The random number generator is used for generating a random number under the control of the controller as a key for data encryption and decryption operation;
the data encryption and decryption unit at least comprises an encryption processing unit, a decryption processing unit and a key storage unit, wherein the encryption processing unit is used for executing data encryption operation; the decryption processing unit is used for executing data decryption operation; the key storage unit is used for storing a key;
the storage module comprises a data storage area and an encryption card storage area, and the data storage area is used for normal data storage of the USB flash disk;
referring to fig. 2, which is a schematic diagram illustrating the principle of an encryption card storage area according to the present invention, the encryption card storage area is provided with an encryption storage unit and a decryption storage unit, and the encryption storage unit and the decryption storage unit are both provided with a plurality of storage units for storing data after performing an encryption operation or a decryption operation, respectively;
the controller is connected with the data encryption and decryption unit and the encryption card storage area and is used for acquiring the command sent by the host computer, analyzing the command and executing corresponding processing;
when the obtained command is a write command and the write address is a data storage area, the controller sends the task to be processed to the data encryption and decryption unit, and the task to be processed is stored in the data storage area after being encrypted by the encryption processing unit;
when the obtained instruction is a write instruction and the write address is an encryption storage unit, the controller sends the task to be processed to the data encryption and decryption unit, and the task to be processed is directly stored in the corresponding storage unit after being encrypted by the encryption processing unit; when the obtained instruction is a write instruction and the write address is a decryption storage unit, the controller sends the task to be processed to the data encryption and decryption unit, and the task to be processed is directly stored in the corresponding storage unit after being decrypted by the decryption processing unit; simultaneously, the controller feeds back a task completion message to the host, wherein the feedback task completion message at least comprises the address information of the storage unit corresponding to the task;
when the obtained instruction is a read instruction and the address is a data storage area, the controller reads data information corresponding to the address and sends the data information to the data encryption and decryption unit, and the data information is decrypted by the decryption processing unit and then sent to the host;
when the obtained command is a read command and the address is the storage area of the encryption card, the controller directly reads the data information of the storage unit corresponding to the address and sends the data information to the host.
By adopting the technical scheme, the encryption card storage area is arranged in the storage module, the encryption and decryption functions of the common hard disk in the host are realized by adopting the standard storage interface and the standard protocol, the encryption and decryption functions are packaged in the storage protocol, and the encryption and decryption operations can be realized by adopting the read-write instruction. For the host, the U disk of the invention is completely the same as the prior external common storage device, such as a common storage U disk, a mobile hard disk and the like. Compared with the prior art, the invention has the normal data storage function and also has the data encryption and decryption functions of the common hard disk in the host. Under the framework of the invention, the data encryption operation is equivalent to writing the data to be encrypted into the storage area of the encryption card, and the host can process other operations after sending a write command without waiting; and after the encryption/decryption operation is completed, the USB flash disk sends a notification instruction to inform the host that the encryption operation of the corresponding task is completed, the host acquires data information stored in the corresponding address through a reading instruction, stores the data in an external common storage disk and completes one external encryption/decryption operation flow.
In the technical scheme, the data storage, the encryption/decryption operation and the address space are bound, the data storage or the external decryption operation can be analyzed by identifying the address space, and meanwhile, the specific encryption/decryption operation type can be obtained by analyzing the address, so that the complexity of the protocol is greatly simplified.
In addition, a plurality of storage units are arranged in the encryption card storage area; each storage unit is used for storing one task, and each data encryption and decryption unit is correspondingly distributed with a plurality of storage units, so that the data encryption and decryption unit can cache a plurality of tasks; meanwhile, the data encryption and decryption unit directly stores the tasks in the corresponding storage units after completing encryption/decryption operation; the controller is connected with the encryption card storage area and can directly read the data information in the encryption card storage area. By adopting the framework, the writing-in and reading-out of the storage area of the encryption card are completed through two independent channels, and the data encryption and decryption unit can be absorbed in the data encryption and decryption, so that the data encryption and decryption efficiency is greatly improved.
In a preferred embodiment of the invention, when the controller executes write operation and the address is the memory area of the encryption card, a free memory cell is selected and the address information and the task to be processed are sent to the data encryption and decryption unit together; and the data encryption and decryption unit directly stores the processed tasks into the storage unit after executing encryption and decryption operations. That is, the controller allocates the idle storage module to store the task while allocating the task, thereby conveniently establishing the mapping relationship. By adopting the technical scheme, the data encryption and decryption unit can be directly stored to the corresponding storage unit after the encryption and decryption operation is completed, meanwhile, the controller directly reads and writes the storage unit, and the data are fed back to the host and the data encryption and decryption process are completely independent, so that the processing efficiency is greatly improved.
Further, the controller sets a data storage mapping table for recording the stored information, the algorithm used by the stored information and the corresponding address of the stored information.
Further, the controller sets an encryption card memory mapping table, and the encryption card memory mapping table is used for recording the addresses of each task and the corresponding memory unit. And simultaneously, a storage flag bit is also set in the storage mapping table of the encryption card, the storage flag bit is used for identifying the read-write state of the data in the storage unit, and the data in the storage unit is read out and then the storage space is released for subsequent write-in operation. By adopting the technical scheme, the states of data reading and writing in the storage unit are identified by setting the storage flag bit, at least including ready and done states, and when the state is set as ready, the tasks are stored in the corresponding storage units after encryption/decryption; the state is done, which indicates that corresponding data has been read from the storage unit, and the storage space can be released, so that the storage unit can store circularly, and the utilization rate of the storage space is greatly improved.
Further, the U disk is provided with a plurality of data encryption and decryption units, and each data encryption and decryption unit is provided with an ID with a unique identification. The controller sets an engine ID state table, which is used for recording the state of each data encryption and decryption unit and dynamically updating the state for the controller to allocate the tasks to be processed. The controller reasonably regulates and controls the work of the encryption and decryption engine according to the engine state table, and after the task is stored, the data encryption and decryption unit can process the next encryption and decryption task.
The encryption card storage mapping table at least comprises a task number, an engine number, engine state information and storage address information, wherein the task number is a unique identification number set by each received task; the engine number is the identification number of the data encryption and decryption unit which carries out encryption/decryption operation on the task; the engine state information is the working state of the data encryption and decryption process; the storage address information is address information of a storage unit stored after the task performs encryption/decryption operation. Specifically, in the data encryption and decryption operation process, after the controller receives a task sent by the host, an IO task is established and a corresponding task number is determined, and after the IO task completes the specified operation, corresponding feedback is carried out on the host; after an IO task is established, the controller allocates an idle encryption and decryption engine to process the task, wherein the state information at least comprises busy and idle, and the state setting busy represents that the data encryption and decryption unit is performing data processing; the status is set to idle, which indicates that the data encryption and decryption unit completes the processing task, so that the data encryption and decryption unit can undertake a new task. By adopting the technical scheme, the process state of any task, the working state of the encryption and decryption engine and the address space state of the encryption card storage area can be clearly known through the storage mapping table, so that the encryption and decryption processing of the task is facilitated.
In a preferred embodiment, the data encryption and decryption unit selects the corresponding encryption algorithm according to a control instruction of the controller. Further, the controller receives a configuration command of the host, wherein the configuration command is used for configuring the encryption and decryption encryption algorithm type of the data encryption and decryption unit, and the encryption algorithm is at least one of AES-128/256, SM2, SM3, SM4, RSA, 3DES or SHA. Meanwhile, the configuration instruction also comprises the data length of the task to be processed, and the controller reallocates the address space of the storage unit for the data encryption and decryption unit according to the configuration instruction. For example, if the current encryption task size is 2K, and the length after processing by the SM2 encryption algorithm is 4K, the storage space is reallocated by using the 4K space as the basic storage unit. By adopting the technical scheme, the dynamic allocation of the storage units is realized, so that an encryption algorithm can be set according to the requirements of users, and an optimal storage unit can be set according to actual requirements.
In the technical scheme, the control instruction is adopted to select the corresponding encryption algorithm, so that the complexity of the algorithm is increased to a certain extent. In a preferred embodiment, a plurality of encryption and decryption encryption algorithms are arranged in the encryption card, and the algorithm types are directly bound with a specific storage address space. That is, a plurality of encryption storage units and decryption storage units are arranged in a memory, each encryption storage unit or decryption storage unit is bound with the type of a specific encryption algorithm, data write operation is performed on the encryption storage unit at a specified address, a controller analyzes an encryption command of a corresponding encryption and decryption algorithm, similarly, the data write operation controller analyzes a decryption command of the decryption storage unit at the specified address into a decryption command of the corresponding encryption and decryption algorithm, the data encryption and decryption unit selects the corresponding encryption and decryption algorithm to perform encryption and decryption operation, after the encryption and decryption processing is finished, the data after the encryption and decryption processing is stored in the encryption/decryption storage unit, the controller informs a host of read operation performed on the address, and the read data is the data after the encryption and decryption processing is finished. By adopting the technical scheme, the algorithm type is directly bound with the specific storage address space, so that the data communication protocol is greatly simplified.
In a preferred embodiment, referring to fig. 3, a schematic diagram of another preferred embodiment of the present invention is shown, which further includes a data buffer, where the data buffer is connected to the controller, the USB interface, the data encryption/decryption unit, and the storage module, and is used for caching data.
In a preferred embodiment, the encryption card storage area adopts a plurality of eMMC chips, and the plurality of eMMC chips are cascaded through a bus.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A data processing method of an encrypted USB flash disk is characterized by comprising the following steps:
step S1: the USB flash disk is accessed to an external host;
step S2: the host sends an instruction to the USB flash disk;
step S3: the USB flash disk acquires and analyzes the instruction sent by the host computer and then executes corresponding operation;
step S4: feeding back a message to the host after the operation is finished;
the USB flash disk at least comprises a USB interface, a controller, a data encryption and decryption unit and a storage module, wherein the data encryption and decryption unit at least comprises an encryption processing unit, a decryption processing unit and a secret key storage unit, and the encryption processing unit is used for executing data encryption operation; the decryption processing unit is used for executing data decryption operation; the key storage unit is used for storing a key;
the storage module comprises a data storage area and an encryption card storage area, and the data storage area is used for normal data storage of the USB flash disk;
the encryption card storage area is further provided with an encryption storage unit and a decryption storage unit, and the encryption storage unit and the decryption storage unit are respectively provided with a plurality of storage units which are respectively used for storing data after encryption operation or decryption operation is executed;
the controller is connected with the data encryption and decryption unit and the USB interface and is used for acquiring the instruction sent by the host computer, analyzing the instruction and executing corresponding processing;
in step S3, when the obtained instruction is a write instruction and the write address is a data storage area, the controller sends the task to be processed to the data encryption and decryption unit, and stores the task in the data storage area after being encrypted by the encryption processing unit;
when the obtained instruction is a write instruction and the write address is an encryption storage unit, the controller sends the task to be processed to the data encryption and decryption unit, and the task to be processed is directly stored in the corresponding storage unit after being encrypted by the encryption processing unit; when the obtained instruction is a write instruction and the write address is a decryption storage unit, the controller sends the task to be processed to the data encryption and decryption unit, and the task to be processed is directly stored in the corresponding storage unit after being decrypted by the decryption processing unit;
in step S4, after the write command is executed and the address is the encrypted card storage area, the controller feeds back a task completion message to the host, where the task completion message at least includes address information of a storage unit corresponding to the task;
when the obtained instruction is a read instruction and the address is a data storage area, the controller reads data information corresponding to the address and sends the data information to the data encryption and decryption unit, and the data information is decrypted by the decryption processing unit and then sent to the host;
when the obtained command is a read command and the address is the storage area of the encryption card, the controller directly reads the data information of the storage unit corresponding to the address and sends the data information to the host.
2. The data processing method of the encrypted U disk according to claim 1, wherein the U disk further comprises a random number generator and an algorithm storage unit, the random number generator is used for generating a random number as a key for data encryption and decryption operation under the control of the controller;
the algorithm storage unit is connected with the controller and the data encryption and decryption unit and is used for storing the algorithm of data encryption and decryption.
3. The data processing method of the encryption U disk according to claim 1 or 2, further comprising a step of obtaining a configuration command sent by a host, wherein the configuration command is used for configuring the encryption and decryption parameters of the encryption and decryption engine; and the data encryption and decryption unit selects a corresponding encryption and decryption algorithm according to the configuration parameters.
4. The data processing method of the encrypted USB flash disk according to claim 3, wherein the algorithm for encrypting and decrypting the data in the algorithm storage unit is at least any one of AES-128/256, SM2, SM3, SM4, RSA, 3DES or SHA.
5. The data processing method of the encryption U disk according to claim 1 or 2, further comprising a data buffer, wherein the data buffer is connected to the controller, the USB interface, the data encryption/decryption unit and the storage module, and is used for buffering data.
6. The data processing method of the encrypted USB flash disk according to claim 1 or 2, wherein the memory module employs multiple eMMC chips, and multiple eMMC chips are cascaded through a bus.
7. The data processing method of the encryption U disk according to claim 1 or 2, wherein the controller performs a write operation and addresses a storage area of the encryption card, selects a free storage unit and sends address information of the free storage unit to the data encryption/decryption unit together with the task to be processed; and the data encryption and decryption unit directly stores the processed tasks into the storage unit after executing encryption and decryption operations.
8. The data processing method of the encrypted USB flash disk according to claim 1 or 2, wherein the controller sets a data storage mapping table for recording the stored information, the algorithm adopted by the stored information and the corresponding address of the stored information.
9. The data processing method of the encrypted USB flash disk according to claim 1 or 2, wherein the controller sets an encrypted card memory map table for recording the address of each task and its corresponding storage unit.
10. The data processing method of the encrypted USB flash disk according to claim 9, wherein the encryption card memory mapping table further sets a storage flag bit for identifying the read/write status of the data in the storage unit, and the data in the storage unit is read out to release the storage space for the subsequent write operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810850459.9A CN110765499A (en) | 2018-07-28 | 2018-07-28 | Data processing method of encrypted USB flash disk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810850459.9A CN110765499A (en) | 2018-07-28 | 2018-07-28 | Data processing method of encrypted USB flash disk |
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| Publication Number | Publication Date |
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| CN110765499A true CN110765499A (en) | 2020-02-07 |
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| CN201810850459.9A Withdrawn CN110765499A (en) | 2018-07-28 | 2018-07-28 | Data processing method of encrypted USB flash disk |
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| CN (1) | CN110765499A (en) |
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2018
- 2018-07-28 CN CN201810850459.9A patent/CN110765499A/en not_active Withdrawn
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