CN1866224A - Mobile memory device and method for accessing encrypted data in mobile memory device - Google Patents
Mobile memory device and method for accessing encrypted data in mobile memory device Download PDFInfo
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- CN1866224A CN1866224A CN 200510071193 CN200510071193A CN1866224A CN 1866224 A CN1866224 A CN 1866224A CN 200510071193 CN200510071193 CN 200510071193 CN 200510071193 A CN200510071193 A CN 200510071193A CN 1866224 A CN1866224 A CN 1866224A
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Abstract
The disclosed mobile storage device comprises: a mobile storage device with an enciphered partition to store enciphered data and an interface to connect computer, and a hardware key device for key storage. It also discloses the method to access the enciphered data in the device. This invention overcomes the defects in prior art, fit to plug and play, and reduces device greatly.
Description
Technical field
The present invention relates to the mobile storage technical field, relate to a kind of flash memory device or rather, and the method for the enciphered data in the flash memory device being carried out access.
Background technology
At present, movable storage device has become the common equipment of user's swap data owing to can provide bigger storage space and easy to carry for the user.Common movable storage device has products such as portable hard drive, movable flashing.Movable storage device generally is connected with computing machine by similar interfaces such as USB interface, 1394 interfaces.
The data file that the user is saved in the movable storage device might be classified papers, for security consideration, need carry out encryption to this document, and be kept in the encrypted partition of movable storage device, encrypted partition is that with the different of public partition the data that are kept in the encrypted partition can not arbitrarily be deleted.Wherein, data encryption is exactly to adopt certain cryptographic algorithm, makes that the file that is kept on the movable storage device is the form of ciphertext, and the user at first needed to input password before reading file, after password is correct, by specific key the data file is decrypted again.Before not being decrypted by the key that matches, the data that the user can see are mess codes, can't reading of data; After key matches, sense data normally then.
At present, processing has two kinds of schemes at encryption and decryption: a kind of is software encryption and decryption scheme, and another kind is the hardware enciphering and deciphering scheme.For software encryption and decryption scheme, because the data in the public partition of movable storage device can arbitrarily change, and password and key must safe storage, so password and key all need to leave in the encrypted partition.Obviously, this location mode makes password in a single day be decrypted, key in the encrypted partition also will be obtained, and during other people data in stealing encrypted partition, can steal key together, as long as can break a code, the data file after just can obtaining deciphering by key, therefore this location mode causes safety of data not high.
For the hardware enciphering and deciphering scheme, need in the movable storage device to be provided for carrying out the hardware enciphering and deciphering chip that encryption and decryption is handled, also need to be provided with hardware keys.The movable storage device of use hardware enciphering and deciphering scheme as shown in Figure 1.After the user had inputed correct password, the hardware enciphering and deciphering chip in the movable storage device just can obtain key from hardware keys, and according to this key the data file was decrypted processing.If the user need preserve the data after the processing, then after the user inputed correct password, the hardware enciphering and deciphering chip just can obtain key from hardware keys, and carried out encryption according to the data file that this key is treated preservation.This encryption and decryption scheme need be provided with the hardware enciphering and deciphering chip in movable storage device, and the price of deciphering chip is often higher.In addition, the algorithm in the hardware enciphering and deciphering chip is fixed, so the figure place of key must be fixed, but the figure place of key is long more, the secret coefficient of data just can be high more, if the figure place that the key setting is long, the price of the hardware enciphering and deciphering chip that then matches also can increase thereupon.Therefore, wanting has higher secret coefficient, and the cost of movable storage device also will correspondingly increase.In addition, hard disk in this hardware enciphering and deciphering scheme need be connected with control chip by the hardware enciphering and deciphering chip, therefore the hard disk in the movable storage device has just been encrypted fully, that is to say, all storage spaces in the movable storage device all are encrypted partitions, can't provide public partition to the user, must import password before the user capture movable storage device, obviously this makes the use of movable storage device be restricted.
Summary of the invention
In view of this, subject matter to be solved by this invention is to provide a kind of flash memory device, and this flash memory device can guarantee the high security storage of data, and does not need to be provided with deciphering chip.
Another problem to be solved by this invention is to provide the method for enciphered data in a kind of access flash memory device.
For overcoming the above problems, the invention provides following technical scheme:
A kind of flash memory device of the present invention, this equipment comprise movable storage device and hardware keys equipment, wherein,
Movable storage device is used for the data file of storage encryption, is provided with the encrypted partition of the data file that is used for storage encryption in the described equipment, and has the interface that is connected with computing machine;
Hardware keys equipment is used for storage key, and described equipment is connected with computing machine.
Described movable storage device comprises: memory module and control chip, and further be provided with interfacing expansion module, wherein,
Memory module is used for the data file of storage encryption, and is provided with the encrypted partition that is used for the stored encrypted data file in the described module;
Interfacing expansion module is used for providing the interface of at least two energy with computer interactive at movable storage device;
Control chip is used for according to the control of computing machine the data of memory module being carried out access, is connected with in the interface that memory module and interfacing expansion module provide one;
Described movable storage device is further used for providing interface for other equipment, and the described interface that provides is: the interface that described interfacing expansion module provides, perhaps other interfaces of generating of the interface that provides based on described interfacing expansion module;
Described hardware keys equipment is connected with computing machine by the interface that movable storage device provides; Perhaps directly be connected with computing machine.
Described interfacing expansion module is a hub.
The interface that described interfacing expansion module provides is USB interface and/or 1394 interfaces.
Further be provided with the public partition that is used to store the general data file in the described memory module.
Described hardware keys equipment is USB FLASH dish, SD/MMC card or CF card.
The method of enciphered data in a kind of access flash memory device of the present invention, described movable storage device has the interface that is connected with computing machine, and in this movable storage device, encrypted partition is set, and configure hardware key devices, described hardware keys equipment is connected with computing machine, and this method further may further comprise the steps:
A. the computing machine that links to each other with movable storage device is mapped as corresponding encrypted partition with the encrypted partition of movable storage device;
B. after described computing machine has been imported the proper password of encrypted partition the user, the hardware keys equipment that is connected with this computing machine according to hardware keys equipment mark information searching, and utilize the key of preserving in the hardware keys equipment that the data file encryption of preserving in the encrypted partition is decrypted processing, and/or the data file of encrypted partition to be deposited is carried out encryption.
Described movable storage device provides the interface that inserts computing machine based on the interface of self and computer interactive for other equipment;
Described hardware keys equipment is connected to computing machine: the interface that provides by movable storage device is connected with computing machine, perhaps directly is connected with computing machine.
The interface that described movable storage device provides for other equipment is USB interface and/or 1394 interfaces.
Described hardware keys equipment is USB FLASH dish, SD/MMC card or CF card.
The present invention program is by being provided with movable storage device and hardware keys equipment respectively, movable storage device is used to preserve the ciphered data file, hardware keys equipment is used to preserve key, thereby key and password are separated preservation, has improved the security of data file encryption in the movable storage device.
The hardware keys equipment that the present invention program provides is independent of movable storage device, can plug and play, and do not need special hardware encryption chip is set as prior art, thereby in convenient for users, also greatly reduce the cost of movable storage device.
The present invention program also is provided for hardware keys equipment is inserted the interface of computing machine on movable storage device, make on computers not when using inadequately with the interface of hardware keys matched or interface, hardware keys equipment can insert computing machine by movable storage device, has further facilitated user's use.
Can also be provided for storing the public partition of general data on the movable storage device that the present invention program provided, further facilitate user's use.
In addition, because the encryption and decryption of movable storage device finished by software mode by computing machine, so the key in the hardware keys equipment can be provided with arbitrarily, if with computing machine in the software coupling.As everyone knows, by software mode coupling key is to realize very easily, therefore, the key of random length can be set as required, can also revise the key in the hardware keys equipment as required, thereby further improved the security of data file encryption in the movable storage device, and be convenient to the upgrading of manufacturer product.
Description of drawings
Fig. 1 is present movable storage device structural representation;
Fig. 2 is the structural representation of the flash memory device that the present invention program provided;
Fig. 3 is the present invention's flash memory device synoptic diagram behind the expansion interface in movable storage device;
Fig. 4 is the realization flow figure of the embodiment of the invention.
Embodiment
The flash memory device that the present invention program provided as shown in Figure 2, this flash memory device comprises movable storage device and hardware keys equipment, wherein, movable storage device is used to store data, the data of being stored comprise the ciphered data file at least, so need to be provided with encrypted partition in this equipment; Hardware keys equipment then is used for storage key.These two equipment all need to be connected with computing machine.
This movable storage device specifically can comprise memory module and control chip, and memory module is used to store data, and these data comprise the ciphered data file, and the encrypted partition of movable storage device promptly is located in this module.Control chip then is used for according to the control of computing machine the data of memory module being carried out access, and this control chip is connected with computing machine by the interface in the movable storage device, and is connected with memory module.Certainly, this movable storage device can also be provided with public partition, promptly in the memory module except encrypted partition is set, public partition also is set, in order to the storage general data.
Use for ease of the user, can also expand the interface that is connected with computing machine in this movable storage device, obtain other equipment to be inserted by this equipment the interface of computing machine, specifically can be that interfacing expansion module is set, this interfacing expansion module specifically can be a hub, provide the interface of at least two energy with computer interactive by this interfacing expansion module in movable storage device, one of them is used for being connected of control chip and computing machine.Like this, hardware keys equipment just can insert computing machine by other interfaces that this movable storage device provided.Certainly, if exist and the adaptive interface of hardware keys equipment on the computing machine, this hardware keys equipment also can directly be connected with computing machine.Be provided with signal that hub inserts computing machine by movable storage device as interfacing expansion module and hardware keys equipment in the movable storage device as shown in Figure 3.
Encryption and decryption is afterwards handled and is then finished by software program by PC, and therefore, the key length in the hardware keys equipment can be provided with arbitrarily as required, as long as can mate with software program.PC can be mapped to the encrypted partition in the movable storage device among this PC after determining to have inserted movable storage device.In addition, if also be provided with public partition in the memory module of this movable storage device, then also can shine upon the information of this public partition among this PC.PC is after definite hardware keys equipment has also inserted, equally can be in this PC with the hardware keys device map, for preventing that the user from deleting key because of maloperation, also be the safety that guarantees key, the subregion that can hardware keys shines upon is set to hide, certainly, can directly the hardware keys module be provided with mapping yet.
After having carried out above-mentioned processing, when PC needs data in the access encrypted partition the user, at first need the user to input correct encrypted partition password, just can visit the encrypted partition in the memory module afterwards.For the data file in the encrypted partition is shown as the form that the user can discern, and/or for to deposit other data files in encrypted partition with encrypted form, also need to search the hardware keys module by the identification information of hardware keys module, after from the hardware keys module, obtaining corresponding key, by this key the data file is carried out encryption and decryption again and handle.
Because the interface that movable storage device adopted has a variety of, such as, can be USB interface, 1394 interfaces, and other similar interface, and the present invention program is basic identical at the processing of these interfaces, only is that example is elaborated to the present invention program below with the USB interface therefore.
The interfacing expansion module that the present invention program is provided with in movable storage device can be usb hub (USB HUB), and USB HUB can provide two or more USB interface.Control chip in the movable storage device can be USB to IDE control chip, and the USB end of this control chip is connected on the USB HUB.Hardware keys equipment can coil for USB, can be connected with computing machine by the USB interface that USB HUB provides, if unnecessary USB interface is arranged on the computing machine, then this hardware keys equipment can also directly be connected with USB interface of computer.Hardware keys equipment can also be other storage mediums such as SD/MMC card, CF card, like this, as inserting computing machine by movable storage device, then movable storage device need be handled USB interface, such as, can on USB interface, increase a conversion chip, use for hardware keys equipment with the interface that other types are provided by USB interface.
Because hardware keys equipment separates with movable storage device and is provided with, therefore can only shine upon the encrypted partition of movable storage device among the PC, PC also can shine upon hardware keys equipment, and just for guaranteeing the security of key, the subregion that should hardware keys equipment be shone upon is set to hide.Certainly, if also be provided with public partition in the movable storage device, then PC also can shine upon this public partition.
In addition, the PC that is connected with movable storage device need have the encryption handling function, and carrying out encryption and decryption processing etc. by this function, if PC this function not, then the user can't carry out operations such as access to this movable storage device.Specifically, encryption handling software need be set in PC, with after PC links to each other, PC carries out processing as shown in Figure 4 at movable storage device.This handles corresponding following steps:
Specifically, PC can be that the program in internal memory sends broadcast announcement, the core resident trace routine then can learn whether this movable storage device is the equipment of shaking hands of oneself according to this broadcast announcement in the encryption handling software, also the equipment that promptly matches with encryption handling software.After definite this movable storage device is the equipment of shaking hands with self, need shine upon processing to this movable storage device, as previously mentioned, the encryption handling software among the PC need shine upon encrypted partition in the movable storage device and public partition.
If encryption handling software finds the relevant hardware key devices, then from this hardware keys equipment, obtain key; Otherwise, can point out the user to insert hardware keys equipment.
Encryption handling software obtains key from hardware keys equipment, it specifically is the order of obtaining key to the driver transmission of hardware keys equipment earlier, the order that driver then can be understood this command conversion for hardware keys equipment, and send to this hardware keys equipment.Hardware keys equipment then sends to driver according to this order with key, and driver sends to key encryption handling software again.
After the user inserted hardware keys equipment, PC can shine upon for this equipment, and hid the subregion that mapping obtains, and can certainly not shine upon.
The key that step 406, the utilization of encryption handling software obtain, and according to certain cryptographic algorithm data are encrypted or decryption processing.
Key in employed cryptographic algorithm of this encryption handling software and the hardware keys equipment all pre-sets, and as long as key is corresponding with cryptographic algorithm.Because it is very convenient to revise cryptographic algorithm in software program, therefore, the key of preserving in the hardware keys equipment just can be provided with different length as required, such as being set to 40,64,128,192 etc., can also make amendment to key as required, especially for manufacturer, the product of different editions only need carry out simple data and change and can realize.
If the user needs the enciphered data in the reading encrypted subregion, then encryption handling software can obtain the enciphered data of not deciphering in the encrypted partition, and this data file is decrypted processing according to the key that obtains and certain algorithm, wherein, encryption handling software is to obtain wherein data according to the sign of encrypted partition, this sign can be VID, PID, also can be other signs.If the user need deposit data in encrypted partition, then encryption handling software can utilize the key and the cryptographic algorithm that obtain that this data file is carried out encryption, and deposits the data encrypted file in encrypted partition.
Can realize access by above-mentioned steps to data file encryption in the encrypted partition.
The above only is the present invention program's preferred embodiment, not in order to limit protection scope of the present invention.
Claims (10)
1, a kind of flash memory device is characterized in that, this equipment comprises movable storage device and hardware keys equipment, wherein,
Movable storage device is used for the data file of storage encryption, is provided with the encrypted partition of the data file that is used for storage encryption in the described equipment, and has the interface that is connected with computing machine;
Hardware keys equipment is used for storage key, and described equipment is connected with computing machine.
2, device according to claim 1 is characterized in that, described movable storage device comprises: memory module and control chip, and further be provided with interfacing expansion module, wherein,
Memory module is used for the data file of storage encryption, and is provided with the encrypted partition that is used for the stored encrypted data file in the described module;
Interfacing expansion module is used for providing the interface of at least two energy with computer interactive at movable storage device;
Control chip is used for according to the control of computing machine the data of memory module being carried out access, is connected with in the interface that memory module and interfacing expansion module provide one;
Described movable storage device is further used for providing interface for other equipment, and the described interface that provides is: the interface that described interfacing expansion module provides, perhaps other interfaces of generating of the interface that provides based on described interfacing expansion module;
Described hardware keys equipment is connected with computing machine by the interface that movable storage device provides; Perhaps directly be connected with computing machine.
3, device according to claim 2 is characterized in that, described interfacing expansion module is a hub.
4, device according to claim 2 is characterized in that, the interface that described interfacing expansion module provides is USB interface and/or 1394 interfaces.
5, device according to claim 2 is characterized in that, further is provided with the public partition that is used to store the general data file in the described memory module.
According to arbitrary described device in the claim 1 to 5, it is characterized in that 6, described hardware keys equipment is USB FLASH dish, SD/MMC card or CF card.
7, the method for enciphered data in a kind of access flash memory device, it is characterized in that, described movable storage device has the interface that is connected with computing machine, and in this movable storage device, encrypted partition is set, and configure hardware key devices, described hardware keys equipment is connected with computing machine, and this method further may further comprise the steps:
A. the computing machine that links to each other with movable storage device is mapped as corresponding encrypted partition with the encrypted partition of movable storage device;
B. after described computing machine has been imported the proper password of encrypted partition the user, the hardware keys equipment that is connected with this computing machine according to hardware keys equipment mark information searching, and utilize the key of preserving in the hardware keys equipment that the data file encryption of preserving in the encrypted partition is decrypted processing, and/or the data file of encrypted partition to be deposited is carried out encryption.
8, method according to claim 7 is characterized in that, described movable storage device provides the interface that inserts computing machine based on the interface of self and computer interactive for other equipment;
Described hardware keys equipment is connected to computing machine: the interface that provides by movable storage device is connected with computing machine, perhaps directly is connected with computing machine.
9, method according to claim 8 is characterized in that, the interface that described movable storage device provides for other equipment is USB interface and/or 1394 interfaces.
10, method according to claim 7 is characterized in that, described hardware keys equipment is USBFLASH dish, SD/MMC card or CF card.
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