CN102023936B - Method for decrypting encrypted data in USB (universal serial bus) storage device - Google Patents
Method for decrypting encrypted data in USB (universal serial bus) storage device Download PDFInfo
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Abstract
The invention relates to a method for decrypting encrypted data in a USB (universal serial bus) storage device, a switching device is arranged between a host and a U disk, and a first data memory area, a second data memory area, a third data memory area and a fourth data memory area of the switching device are arranged along the clockwise direction; a host pointer, a U disk pointer and a decryption pointer are configured, the host pointer and the U disk pointer point to a next data buffer area along the clockwise direction, an encryption pointer simultaneously points to the next data buffer area along the clockwise direction, and the host pointer simultaneously points to the next data buffer area along the clockwise direction; and a main port of the switching device is used for transmitting next unit ciphertext data to the data buffer area pointed by the U disk pointer, the decryption module is used for decrypting the data in the data buffer area pointed by the decryption pointer, and the switching device is used for transmitting the data in the data buffer area pointed by the host pointer from the port to the host. By adopting the method, the separation of plaintext data, the ciphertext data and the encryption algorithm can be realized, and the data decryption speed between the host and a mobile storage device can be further improved.
Description
Technical field
The present invention relates to a kind of decryption method of the USB of being used for storage facilities enciphered data, belong to the safety storing application.
Background technology
At present, the USB flash disk memory device is widely used, and for data security, often in the USB flash disk memory device, stores ciphered data, and the safety with effective guarantee digital asset information is not obtained it by the disabled user.Therefore, original text data high-speed encrypting storing is widely used in various information security fields to the USB flash disk memory device.
At present, for the enciphered data of preserving in the USB flash disk memory device is deciphered, the measure of taking is in ordinary mobile storage, to increase by a deciphering module.But, the present slow problem of design ubiquity data decryption speed.
Along with the widespread use of USB flash disk memory device high capacity movable storage device, the enciphered data amount of being stored on these equipment is increasing.Therefore how to improve deciphering efficient and become the direction that those skilled in the art make great efforts.
Summary of the invention
The object of the invention provides a kind of decryption method of the USB of being used for storage facilities enciphered data, and this method has realized separating of encrypt data, clear data and decipherment algorithm, and has improved data decryption speed between main frame and the movable storage device.
For achieving the above object, the technical scheme that the present invention adopts is:
1. decryption method that is used for USB storage facilities enciphered data may further comprise the steps:
Receiving from the reading instruction and data unit length of main frame of step 2. switching device from port, and this is read instruction and data unit length is transmitted to USB flash disk;
Step 3. configure host pointer, USB flash disk pointer and deciphering pointer; Said main frame pointer; Be used to identify the address of the data storage area of main frame reading of data, said USB flash disk pointer is used to identify the address of acceptance from the data storage area of the data of USB flash disk; Said encryption pointers is used to identify the address of the data storage area of the pending data of deciphering module;
With USB flash disk pointed second data buffer area, main frame pointer and encryption pointers are pointed to first data buffer area during step 4. initialization;
Step 5. switching device master port transmits a unit encrypt data to the current data buffer zone of USB flash disk pointer indication;
If the said switching device master port of step 6. is " free time " state; And when the current data buffer area of USB flash disk pointed along clockwise direction next data buffer area state be " sky "; Then the USB flash disk pointer points to next data buffer area along clockwise direction; Simultaneously, encryption pointers is pointed to next data buffer area along clockwise direction;
Step 7. switching device master port transmits next unit encrypt data to the data buffer of USB flash disk pointer indication, and deciphering module will be deciphered the data buffer data of pointer indication and carry out decryption processing;
Step 8.U index points to next data buffer area along clockwise direction, and simultaneously, the deciphering pointer points to next data buffer area along clockwise direction, and simultaneously, the main frame pointer points to next data buffer area along clockwise direction;
Step 9. switching device master port transmits next unit encrypt data to the data buffer of USB flash disk pointer indication; Deciphering module will be deciphered the data buffer data of pointer indication and carry out decryption processing, and switching device is given main frame from port with data transmission in the data buffer of main frame pointer indication.
Related content in the technique scheme is explained as follows:
1, in the such scheme, the storage space of said data buffer area equates that with said data unit length said four data buffer areas are four continuous data buffer areas on the address.
2, in the such scheme; The length counter that also comprises the unit number of a record data decryption; Carrying out said switching device master port after a unit of the current data buffer zone transmission encrypt data operation of USB flash disk pointer indication, the count value of said length number device subtracts 1, when length counter equals 0; And the main frame pointer equals the USB flash disk pointer, finishes this data decryption process.
3, in the such scheme, at least three kinds of decipherment algorithms are set in the said deciphering module.
Because the technique scheme utilization, the present invention compared with prior art has advantage and effect:
The invention enables whole USB flash disk mobile storage deciphering circulation tipping to put in the course of the work, data rate gets a promotion.When using the movable storage device of read rate below 10MB/s, can accomplish that basically writing rate is harmless; When the movable storage device of operating speed at 30MB/s, can be more than 25MB/s through encrypting the speed that switching device writes; Secondly, realize separating of clear data, encrypt data and AES, improved safety of data greatly; Once more, decrypting process is transparent for domestic consumer, and is easy to use.
Description of drawings
Accompanying drawing 1 is switching device structural representation of the present invention;
Accompanying drawing 2 is schematic flow sheet of the present invention;
Accompanying drawing 3 is switching device hardware synoptic diagram of the present invention;
Accompanying drawing 4 is software configuration synoptic diagram of the present invention;
Accompanying drawing 5 is data parallel synoptic diagram of the present invention;
Accompanying drawing 6 is the time flow chart of computing machine from the movable storage device read data.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described:
Embodiment: a kind of decryption method that is used for USB storage facilities enciphered data may further comprise the steps:
Receiving from the reading instruction and data unit length of main frame of step 2. switching device from port, and this is read instruction and data unit length is transmitted to USB flash disk;
Step 3. configure host pointer usbDevicePos, USB flash disk pointer usbHostPos and deciphering pointer encrPos; Said main frame pointer usbDevicePos; Be used to identify the address of the data storage area of main frame reading of data, said USB flash disk pointer usbHostPos is used to identify the address of reception from the data storage area of the data of USB flash disk; Said encryption pointers encrPos is used to identify the address of the data storage area of the pending data of deciphering module;
During step 4. initialization USB flash disk pointer usbHostPos is pointed to the second data buffer area FIFO2, main frame pointer usbDevicePos and encryption pointers encrPos point to the first data buffer area FIFO1;
Step 5. switching device master port transmits a unit encrypt data to the current data buffer zone of USB flash disk pointer usbHostPos indication;
If the said switching device master port of step 6. is " free time " state flgHostTxRxDone==1; And the current data buffer area FIFO that points to as USB flash disk pointer usbHostPos is next data buffer area FIFO along clockwise direction; (usbHostPos+1) &0x03 state is " sky "; Then USB flash disk pointer usbHostPos points to next data buffer area FIFO along clockwise direction, and simultaneously, encryption pointers encrPos points to next data buffer area FIFO along clockwise direction;
Step 7. switching device master port transmits next unit encrypt data to the data buffer of USB flash disk pointer indication, and deciphering module will be deciphered the data buffer data of pointer indication and carry out decryption processing;
Step 8.U index usbHostPos points to next data buffer area FIFO along clockwise direction; Simultaneously; Encryption pointers encrPos points to next data buffer area FIFO along clockwise direction; Simultaneously, main frame pointer usbDevicePos points to next data buffer area FIFO along clockwise direction;
Step 9. switching device master port transmits next unit encrypt data to the data buffer of USB flash disk pointer indication; Deciphering module will be deciphered the data buffer data of pointer indication and carry out decryption processing, and switching device is given main frame from port with data transmission in the data buffer of main frame pointer usbDevicePos indication.
The storage space of said data buffer area equates that with said data unit length said four data buffer areas are four continuous data buffer areas on the address.
The length number device that also comprises the unit number of a record data decryption; Carrying out said switching device master port after a unit of the current data buffer zone transmission encrypt data operation of USB flash disk pointer usbHostPos indication; The count value of said length number device subtracts 1; When length counter equals 0, and main frame pointer usbDevicePos equals USB flash disk pointer usbHostPos, finishes this data decryption process.
At least three kinds of decipherment algorithms are set in the said deciphering module.
The concrete course of work of present embodiment foregoing is following.
In the USB storage facilities of this enforcement row, the data that have three types are in the master port USB Host of switching device and transmitting between port USB Dev of switching device: USB command block bag CBW, USB state CSW and general data DATA.USB command block bag CBW is the order from port USB Dev that the master port of main frame sends to switching device; Command format is deferred to SCSI transmission command collection; Switching device needs scsi command is extracted from command block bag CBW; Carry out corresponding order, and this CBW order bag, the master port USB Host through switching device is forwarded to USB flash disk.The state that USB state bag CSW reflection the current command piece bag is carried out is the master port USB Host that USB flash disk sends to switching device, and switching device is through being forwarded to the master port of main frame from port USB Dev.
The hardware module explanation:
(1), data buffer area FIFO (2K): size is the 2K byte, and the storage of usb data stream is special-purpose.Because USB2.0 packet size is 512 bytes, therefore, the FIFO of 2K byte is divided into 4, and every block size is 512 bytes.
(2), the master port USB Host of switching device: the switching device hardware module, support USB1.1 and USB2.0 agreement can arrive FIFO through the data of Host port reception USB flash disk, or arrive USB flash disk through the data in the Host port transmission FIFO.
(3), switching device from port USB Dev: the switching device hardware module, support USB1.1 and USB2.0 agreement, can receive data from main frame to FIFO through the Device port, or the data of sending in the FIFO through the Device port arrive main frame.
(4), deciphering module ENCR: the deciphering control module, through calling SM1, SM4, the DES scheduling algorithm carries out encryption and decryption to the data in the data buffer zone FIFO.
(5), SM1: the enciphering and deciphering algorithm module is dispatched by deciphering module ENCR.
(6), SM4: the enciphering and deciphering algorithm module is dispatched by deciphering module ENCR.
(7), DES: the enciphering and deciphering algorithm module is dispatched by deciphering module ENCR.
Project organization is following:
(1), USB Host break in service function: USBHost_ISR ()
The master port USB Host module of switching device is accomplished a data transfer (sending or receive 512 bytes), then can produce once to interrupt, and in the corresponding break in service function, can dispose this module status mark.
(2), USB Dev break in service function: USBDev_ISR ()
Switching device accomplish a data transfer (sending or receive 512 bytes) from port USB Dev module, then can produce once and to interrupt, in the corresponding break in service function, can dispose this module status mark.
(3), ENCR break in service function: Encr_ISR ()
Deciphering module ENCR module is accomplished once deciphering (deciphering 512 bytes), then can produce once and interrupt, and in the corresponding break in service function, can dispose this module status mark.
(4), the master port USB Host status indication of switching device: flgHostTxRxDone
Mark USB Host module is busy or idle.
FlgHostTxRxDone equals 0, and USB Host is busy;
FlgHostTxRxDone equals 1, and USB Host is idle;
(5), switching device from port USB Dev status indication: flgDeviceTxRxDone
Mark USB Dev module is busy or idle.
FlgDeviceTxRxDone equals 0, and USB Dev is busy;
FlgDeviceTxRxDone equals 1, and USB Dev is idle;
(6), deciphering module ENCR status indication: flgSecurityDone
Mark deciphering module ENCR module is busy or idle.
FlgSecurityDone equals 0, and ENCR is busy;
FlgSecurityDone equals 1, and ENCR is idle;
(7), USB flash disk pointer: usbHostPos
The FIFO start address of current USB Host operation.After USB Host receives or sends a packet, the next FIFO of pointed, order is: FIFO0 → FIFO1 → FIFO2 → FIFO3 → FIFO0.
UsbHostPos equals 0, the current operation of USB Host be FIFO0;
UsbHostPos equals 1, the current operation of USB Host be FIFO1;
UsbHostPos equals 2, the current operation of USB Host be FIFO2;
UsbHostPos equals 3, the current operation of USB Host be FIFO3;
(8), main frame pointer: usbDevicePos
The FIFO start address of current USB Dev operation.After USB Dev receives or sends a packet, the next FIFO of pointed, order is: FIFO0 → FIFO1 → FIFO2 → FIFO3 → FIFO0.
UsbDevicePos equals 0, the current operation of USB Host be FIFO0;
UsbDevicePos equals 1, the current operation of USB Host be FIFO1;
UsbDevicePos equals 2, the current operation of USB Host be FIFO2;
UsbDevicePos equals 3, the current operation of USB Host be FIFO3;
(9), deciphering pointer: encrPos
The FIFO start address of current ENCR operation.Behind packet of ENCR deciphering, the next FIFO of pointed, order is: FIFO0 → FIFO1 → FIFO2 → FIFO3 → FIFO0.
EncrPos equals 0, the current operation of USB Host be FIFO0;
EncrPos equals 1, the current operation of USB Host be FIFO1;
EncrPos equals 2, the current operation of USB Host be FIFO2;
EncrPos equals 3, the current operation of USB Host be FIFO3;
(10), data buffer area fifo status mark:
FIFO is divided into that three kinds of state: FIFO are empty, data fifo is full, data fifo has added and separates or decipher.
Fifo status equals 0, and FIFO is empty;
Fifo status equals 1, and data fifo is full;
Fifo status equals 2, and data fifo is encrypted or deciphered;
(11), management of usb data flow transmission and module schedules program
Be responsible for the scheduling of USB Host, USB Dev and three hardware modules of ENCR, management traffic read-write process.
Read flow process (PC is from USB flash disk read data workflow)
USB flash disk → USB Host → ENCR deciphering → USB Dev → PC
PC is from USB flash disk reading of data detailed step:
1, receives that PC sends CBW bag (reading of data order bag);
2, from the CBW bag, obtain data to be transmitted length,, jump to 10 if data to be transmitted length equals zero;
3, USB Host sends this CBW bag to USB flash disk;
4, module pointer initialization, configuration usbHostPos=1, usbDevicePos=0, encrPos=0;
5, configuration USB Host module receives data pointer and points to FIFO1 (usbHostPos=1), and USB flash disk sends Data In request, configuration USB Host module flgHostTxRxDone==0 of " having much to do ";
If 6 USB Host module " free time " flgHostTxRxDone==1, and the current FIFO position forward circulation pointed to of USB Host pointer usbHostPos add a position (fifo status of usbHostPos+1) &0x03 is " sky ":
Current FIFO is set, the FIFO that usbHostPos points to, state is " data are full ";
The next data buffer of configuration USB Host pointed FIFO forward circulation adds one: the &0x03 of usbHostPos=(usbHostPos+1);
It is the FIFO (usbHostPos) of USB Host pointed that configuration USB Host module receives data FIFO;
Transmission data units number=transmission data units number-1;
If the transmission data units number is greater than zero, USB Host sends Data In request to memory device, receives packet;
Put USB Host module and be " having much to do " (flgHostTxRxDone=0);
If 7 ENCR module current states are " free time " (flgSecurityDone==1), and the current FIFO position encrPos forward circulation of deciphering pointed add a position (fifo status of encrPos+1) &0x03 is for " data are full ", then:
The current fifo status of configuration deciphering pointed is " data are encrypted or deciphered ";
The next FIFO of deciphering pointed: (encrPos=(encrPos+1) &0x03);
Configuration ENCR module decrypts data FIFO is the FIFO (encrPos) of ENCR pointed;
Configuration ENCR module is " having much to do " (flgSecurityDone=0);
Start the ENCR module, data are deciphered;
If 8 USB Dev module current states are " free time " (flgDeviceTxRxDone==1); And the current FIFO of USB Dev position usbDevicePos forward circulation add a position (fifo status of (usbDevicePos+1) &0x03) is for " data are deciphered ", then:
The current fifo status of configuration USB flash disk pointed is " sky ";
Next FIFO (forward circulation adds): the usbDevicePos of USB flash disk pointed=(usbDevicePos+1) &0x03;
It is the FIFOusbDevicePos of current USB flash disk pointed that configuration USB Dev module is sent data FIFO;
Configuration USB Dev module is " having much to do " flgDeviceTxRxDone=0;
Send packet and give PC;
If 9 this moment the data transmission unit number be not equal to zero, perhaps usbDevicePos+1) &0x03 is not equal to usbHostPos, then jumps to step 6;
10, USB Host sends Data In request to memory device, obtains the CSW bag;
11, wait for USB Host instruction completion;
12, USB Host reads the CSW bag;
13, wait for that USB Dev is idle;
14, USB Dev sends CSW and wraps the main frame to PC;
15, withdraw from.
Annotate: wherein; USB Host module, USB Dev module and ENCR module are after accomplishing single job; With the interruption that triggers this module; Interrupt program loop, break in service function U SBHost_ISR (), USBDev_ISR () and ENCR_ISR () will carry out, respectively can configuration module state variable: flgHostTxRxDone, flgSecurityDone and flgDeviceTxRxDone.
Shown in accompanying drawing 5,
(1) expression among Fig. 5, the master port USB Host of switching device receives first bag, and the deciphering module Encr of switching device is idle, switching device idle from port module USB Dev;
(2) expression among Fig. 5, Host is received first bag, and Encr is idle, and Dev is idle;
(3) expression among Fig. 5, Host receives second bag, Encr deciphering first bag, Dev is idle;
(4) expression among Fig. 5, Host receives second bag, and Encr has deciphered first bag, and Dev is idle;
(5) expression among Fig. 5, Host is received second bag, and Encr is idle, and Dev is idle;
(6) expression among Fig. 5, Host receives three guarantees, Encr deciphering second bag, Dev sends first bag;
(7) expression among Fig. 5, Host receives the 4th bag, and Encr deciphers three guarantees, and Dev sends second bag;
(8) expression among Fig. 5, Host receives the 5th bag, and Encr deciphers the 4th bag, and Dev sends three guarantees.
Shown in accompanying drawing 6; Assess encrypting switching device maximum transmitted performance, the assessment benchmark is following: USB high-speed transfer pattern, and the maximum bag number of at every turn all being supported with bulk transfer (128) transmits; The USB interface transmission time is the theoretical time; But not the time behind the access movable storage device, system clock 80MHZ, USB interface packet (512B) time of transmission is 13us; Order bag of USB interface transmission or state bag time are 7.5us, and packet time of encrypt/decrypt is 6us.
Performance is following: transmitting the required theoretical time of 128 packets (64KB) is: the transfer rate that 128* (Tcpu2+Tdd)+Tcpu1+ (Tcbw+Tcpu2)+(Thd+Tcpu2)+(Tdec+Tcpu2)+(Tcsw+Tcpu2)=128* (2+13)+3+ (7.5+2)+(13+2)+(6+2)+(7.5+2)=1963us reads is 64KB/1963us=31.8MB/s.
The foregoing description only is explanation technical conceive of the present invention and characteristics, and its purpose is to let the personage who is familiar with this technology can understand content of the present invention and enforcement according to this, can not limit protection scope of the present invention with this.All equivalences that spirit is done according to the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (4)
1. decryption method that is used for USB storage facilities enciphered data is characterized in that: may further comprise the steps:
Step 1. is arranged at switching device between main frame and the USB flash disk; Being connected with the master port of main frame of this switching device from port; The master port of switching device is connected with the port of USB flash disk; The deciphering module of switching device is used to decipher the transmission data between main frame and the USB flash disk, is provided with four data buffer areas in this switching device, and its first data buffer area, second data buffer area, the 3rd data buffer area and the 4th data buffer area are arranged along clockwise direction;
Receiving from the reading instruction and data unit length of main frame of step 2. switching device from port, and this is read instruction and data unit length is transmitted to USB flash disk;
Step 3. configure host pointer, USB flash disk pointer and deciphering pointer; Said main frame pointer; Be used to identify the address of the data buffer area of main frame reading of data, said USB flash disk pointer is used to identify the address of reception from the data buffer area of the data of USB flash disk; Encryption pointers is used to identify the address of the data buffer area of the pending data of deciphering module;
With USB flash disk pointed second data buffer area, main frame pointer and encryption pointers are pointed to first data buffer area during step 4. initialization;
Step 5. switching device master port transmits a unit encrypt data to the current data buffer zone of USB flash disk pointer indication;
If the said switching device master port of step 6. is " free time " state; And when the current data buffer area of USB flash disk pointed along clockwise direction next data buffer area state be " sky "; Then the USB flash disk pointer points to next data buffer area along clockwise direction; Simultaneously, the deciphering pointer points to next data buffer area along clockwise direction;
Step 7. switching device master port transmits next unit encrypt data to the data buffer of USB flash disk pointer indication, and deciphering module will be deciphered the data buffer data of pointer indication and carry out decryption processing;
Step 8.U index points to next data buffer area along clockwise direction, and simultaneously, encryption pointers is pointed to next data buffer area along clockwise direction, and simultaneously, the main frame pointer points to next data buffer area along clockwise direction;
Step 9. switching device master port transmits next unit encrypt data to the data buffer of USB flash disk pointer indication; Deciphering module will be deciphered the data buffer data of pointer indication and carry out decryption processing, and switching device is given main frame from port with data transmission in the data buffer of main frame pointer indication.
2. decryption method according to claim 1 is characterized in that: the storage space of said data buffer area equates that with said data unit length said four data buffer areas are four continuous data buffer areas on the address.
3. decryption method according to claim 1; It is characterized in that: the length counter that also comprises the unit number of a record data decryption; Carrying out said switching device master port after a unit of the current data buffer zone transmission encrypt data operation of USB flash disk pointer indication, the count value of said length counter subtracts 1, and length counter equals 0; And the main frame pointer equals the USB flash disk pointer, finishes this data decryption process.
4. decryption method according to claim 1 is characterized in that: at least three kinds of decipherment algorithms are set in the said deciphering module.
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| CN 201010551241 CN102023936B (en) | 2010-11-19 | 2010-11-19 | Method for decrypting encrypted data in USB (universal serial bus) storage device |
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| CN 201010551241 CN102023936B (en) | 2010-11-19 | 2010-11-19 | Method for decrypting encrypted data in USB (universal serial bus) storage device |
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| CN104573537B (en) * | 2013-10-11 | 2017-09-15 | 群联电子股份有限公司 | Data processing method, memory storage apparatus and memorizer control circuit unit |
| CN105550606A (en) * | 2016-01-25 | 2016-05-04 | 苏州工业园区金鸡湖学校 | USB interface access equipment with data protection function and working method thereof |
| CN107609428A (en) * | 2017-08-16 | 2018-01-19 | 大唐高鸿信安（浙江）信息科技有限公司 | Date safety storing system and method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6421770B1 (en) * | 1997-07-21 | 2002-07-16 | Infineon Technologies Ag | Buffer memory configuration having a memory between a USB and a CPU |
| CN101540191A (en) * | 2009-04-21 | 2009-09-23 | 苏州国芯科技有限公司 | Real-time encrypted U disk and high speed encryption-decryption method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6421770B1 (en) * | 1997-07-21 | 2002-07-16 | Infineon Technologies Ag | Buffer memory configuration having a memory between a USB and a CPU |
| CN101540191A (en) * | 2009-04-21 | 2009-09-23 | 苏州国芯科技有限公司 | Real-time encrypted U disk and high speed encryption-decryption method |
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