CN102023936A - 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 safe storage application.
Background technology
At present, the USB flash disk memory device is widely used, and for data security, often stores ciphered data in the USB flash disk memory device, 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 decrypted, the measure of taking is to increase by a deciphering module in ordinary mobile storage.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 solution used in the present invention 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;
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;
If the described 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 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, the data buffer data that deciphering module will be deciphered the pointer indication are decrypted 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 described data buffer area equates that with described data unit length described 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 described 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 described 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 described deciphering module.
Because the technique scheme utilization, the present invention compared with prior art has following 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 substantially writing rate is harmless; When the movable storage device of operating speed at 30MB/s, can be more than 25MB/s by encrypting the speed that switching device writes; Secondly, realize separating of clear data, encrypt data and cryptographic algorithm, 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 drawings and Examples 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;
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;
If the described 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); The 0x03 state is " sky ", and 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 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, the data buffer data that deciphering module will be deciphered the pointer indication are decrypted 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 described data buffer area equates that with described data unit length described 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 described 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 described 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 described deciphering module.
The concrete course of work of present embodiment foregoing is as follows.
In the USB of this implementation column storage facilities, 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 by 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 by 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 by the data of Host port reception USB flash disk, or arrive USB flash disk by 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 by the Device port, or send data in the FIFO to main frame by the Device port.
(4), deciphering module ENCR: the deciphering control module, by 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 as follows:
(1), USB Host break in service function: USBHost_ISR()
The master port USB Host module of switching device is finished 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 finish 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 finished 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, the USB Host free time;
(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, the USB Dev free time;
(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, the ENCR free time;
(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 three kinds of states: FIFO sky, data fifo are 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), 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 that USB Host pointer usbHostPos points to adds a position (usbHostPos+1) ﹠amp; The fifo status of 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 ﹠amp of usbHostPos=(usbHostPos+1); 0x03;
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 adds a position (encrPos+1) ﹠amp; The fifo status of 0x03 is " 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) ﹠amp; 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 decrypted;
If 8 USB Dev module current states are " free time " (flgDeviceTxRxDone==1), and the current FIFO of USB Dev position usbDevicePos forward circulation adds a position ((usbDevicePos+1) ﹠amp; Fifo status 0x03) is " data are deciphered ", then:
The current fifo status of configuration USB flash disk pointed is " sky ";
The next FIFO(forward circulation of USB flash disk pointed adds one): usbDevicePos=(usbDevicePos+1) ﹠amp; 0x03;
It is the FIFOusbDevicePos of current USB flash disk pointed that configuration USB Dev module sends data FIFO;
Configuration USB Dev module is " having much to do " flgDeviceTxRxDone=0;
Send packet to PC;
If 9 this moment the data transmission unit number be not equal to zero, perhaps usbDevicePos+1) ﹠amp; 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 USB Host instruction is finished;
12, USB Host reads the CSW bag;
13, wait for the USB Dev free time;
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 finishing single job, the interruption of this module will be triggered, 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.
As shown in Figure 5,
(1) expression among Fig. 5, the master port USB Host of switching device receives first bag, the deciphering module Encr free time of switching device, switching device from the port module USB Dev free time;
(2) expression among Fig. 5, Host is received first bag, Encr free time, Dev free time;
(3) expression among Fig. 5, Host receives second bag, Encr deciphering first bag, Dev free time;
(4) expression among Fig. 5, Host receives second bag, and Encr has deciphered first bag, Dev free time;
(5) expression among Fig. 5, Host is received second bag, Encr free time, Dev free time;
(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.
As shown in Figure 6, assess encrypting switching device maximum transmitted performance, the assessment benchmark is as follows: USB high-speed transfer pattern, each maximum bag number of all being supported with bulk transfer (128) transmits, the USB interface transmission time is the theoretical time, and the time behind the non-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 as follows: 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 allow 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 (USB Dev), the master port of switching device (USB Host) 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, be provided with four data buffer areas in this switching device, and its first data storage area, second data storage area, the 3rd data storage area and the 4th data storage 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 (usbDevicePos), USB flash disk pointer (usbHostPos) and deciphering pointer (encrPos), described main frame pointer (usbDevicePos), be used to identify the address of the data storage area of main frame reading of data, described USB flash disk pointer (usbHostPos), be used to identify the address of reception from the data storage area of the data of USB flash disk, described 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 second data buffer area (the 2nd FIFO2), main frame pointer (usbDevicePos) and encryption pointers (encrPos) are pointed to 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 described switching device master port of step 6. is " free time " state (flgHostTxRxDone==1), and the current data buffer area (FIFO) that points to when USB flash disk pointer (usbHostPos) next data buffer area (FIFO) ((usbHostPos+1) along clockwise direction; 0x03) state is " sky ", and then USB flash disk pointer (usbHostPos) points to next data buffer area (FIFO) along clockwise direction, and simultaneously, deciphering pointer (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 the data buffer data that deciphering module will be deciphered the pointer indication are decrypted processing;
Step 8.U index (usbHostPos) points to next data buffer area (FIFO) along clockwise direction, simultaneously, encryption pointers (encrPos) is pointed 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, the data buffer data that deciphering module will be deciphered the pointer indication are decrypted processing, and switching device is given main frame from port with data transmission in the data buffer of main frame pointer (usbDevicePos) indication.
2. decryption method according to claim 1 is characterized in that: the storage space of described data buffer area equates that with described data unit length described 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 described 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 described length number device subtracts 1, length counter equals 0, and main frame pointer (usbDevicePos) equals USB flash disk pointer (usbHostPos), 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 described deciphering module.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104573537A (en) * | 2013-10-11 | 2015-04-29 | 群联电子股份有限公司 | Data processing method, memory storage device and memory control circuit unit |
| CN105913114A (en) * | 2016-01-25 | 2016-08-31 | 苏州工业园区金鸡湖学校 | Protection function equipped USB interface accessing device and the 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 |
-
2010
- 2010-11-19 CN CN 201010551241 patent/CN102023936B/en active Active
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 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104573537A (en) * | 2013-10-11 | 2015-04-29 | 群联电子股份有限公司 | Data processing method, memory storage device and memory control circuit unit |
| 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 |
| CN105913114A (en) * | 2016-01-25 | 2016-08-31 | 苏州工业园区金鸡湖学校 | Protection function equipped USB interface accessing device and the 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 |
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Address after: 215011 Zhuyuan Road 209, Suzhou High-tech Zone, Jiangsu Province 2301, Building 3, Suzhou Pioneer Park Patentee after: Suzhou Guoxin Technology Co., Ltd. Address before: 215011 Zhuyuan Road 209, Suzhou High-tech Zone, Jiangsu Province 2301, Building 3, Suzhou Pioneer Park Patentee before: C*Core Technology (Suzhou) Co., Ltd. |