TWM531642U - Removable storage device - Google Patents

Description

Flash drive device

The present invention relates to a flash drive device, and more particularly to a flash drive device and remote control method for remotely transmitting an unlock code using wireless information transmission.

With the advancement of technology, the memory capacity for storing digital information is getting larger and larger, the cost is getting lower and lower, and the speed of reading and writing is getting faster and faster. The storage technology of traditional disk is gradually eliminated by the memory. Even replacing the technology of disc storage, it has become the most important digital storage technology.

Although memory storage technology has become an important tool for storing digital data. However, in the eyes of those who are interested, it is the best goal to steal important secrets. Especially when the memory products are getting smaller and smaller, becoming a flash drive and being used for commercial purposes, the problem of data confidentiality is even more important, such as the loss of the flash drive. Or being stolen, it will directly lead to the leakage of a large number of personal and confidential documents.

Therefore, there are some flash drive products with encryption function on the market, the encryption methods are not the same, some are encrypted by AES hardware; there are also high-end styles that attach the fingerprint recognition function to the flash drive, which takes into account Cost problem, most of the encrypted discs need to be installed in the computer with the corresponding software. After setting the password on the software, the file can be stored in the flash drive through the software. This way seems safe and operation. Simple, but there are many loopholes and inconvenient use, and it is easy to be cracked by people with a heart.

Referring to FIG. 1, the "data security device and method thereof" of the Republic of China Patent No. I325113 is used for data encryption and decryption between a USB device 20 and a USB host 12, including: a first USB transmission protocol. The analyzer is configured to receive and identify the signal of the USB host, and output a first signal; a second USB transmission protocol analyzer is configured to receive and identify the signal of the USB device, and output a second signal; a file system analyzer electrically coupled to the first USB transport protocol analyzer and the second USB transport protocol analyzer for analyzing the content of the first signal and analyzing the content of the second signal; an encryption unit, Electrically connecting to the file system analyzer, encrypting and outputting the first signal to the USB device according to a command of the file system analyzer; and a decryption unit electrically connected to the file system analyzer, according to the file system The analyzer command decrypts and outputs the second signal to the USB host.

It is similar to the commonly used encrypted flash drives sold on the market. It is necessary to connect the computer to the flash drive, read the confidential application on the flash drive, enter the password to unlock the secure application, and enable the computer to Access the pen drive.

However, when a confidential application provides a user with a password on a computer, it is often the best place for people who want to start. The person who is interested usually uses the exhaustive method. It is a method of password analysis, which is to calculate the password one by one until it is found. The real password will cause the interested person to exchange the correct password and read the information on the flash drive.

From the above description, it can be seen that the conventional protective flash drive still has the following disadvantages in practice:

First, the pen drive must first be connected to the computer:

The computer itself does not have security features or software. Therefore, the flash drive must be provided with an application with the protection function of the flash drive to the computer. When the application is downloaded from the flash drive, the stored data has the opportunity to be stolen.

Second, the password has the opportunity to be cracked:

Generally speaking, with a secret application as a security method for the flash drive, the password has a chance to be cracked on the computer. For example, there are 9999 combinations of four-digit digital passwords. It has been calculated that there is a chance to find the correct password.

Third, a substantial increase in costs:

In general, having a secure application as a pen drive has the lowest cost, but there are information security concerns, while other fingerprints or device cryptosystems will significantly increase the cost of the pen drive and are not in line with the business model of the product.

Therefore, how to use the safer confidentiality mechanism without the need to increase the cost of the pen drive, so that the pen drive does not provide access to the computer device after unlocking is one of the topics that the relevant technical personnel need to study.

In view of the above, an object of the present invention is to provide a flash drive device for accessing digital data by a computer device, and including a data storage device and a remote unlocking device.

The data storage device is detachably coupled to the computer device, and includes a data access module for reading and writing the computer device, a data unlocking control module electrically connected to the data access module, and a The data terminal wireless transceiver module electrically connected with the data unlocking control module has a decryption unit and prestores a data terminal key information.

The remote unlocking device includes an unlocking wireless transceiver module connected to the information wireless transceiver module, and a key generation module electrically connected to the unlocking wireless transceiver module. The key generation module It has an encryption unit and pre-stores an unlocked key information. The remote unlocking device is a mobile phone or tablet device generally installed with an application, and the key generating module is an application (APP) installed in the remote unlocking device to generate a correct key to be transmitted to the Data storage device.

The encryption unit of the key generation module encrypts the unlocked key information into an encryption key information, and transmits the information to the data unlocking control module, and the decryption unit of the data unlocking control module decrypts the encrypted key information. And comparing with the data of the data key to control the Whether the data access module is read or written.

Another technical means of the present invention is that the above-mentioned key generation module further has an unlocking end dynamic password generating unit, and the unlocking end dynamic password generating unit calculates a dynamic password to provide the encryption unit to unlock the unlocking terminal. The key information is encrypted into the encryption key information.

A further technical means of the present invention is that the data unlocking control module has a data dynamic password generating unit, and the data dynamic password generating unit calculates the dynamic password to provide the decrypting unit to provide the encryption key. The information is restored to the unlocked key information.

Another technical means of the present invention is that the data unlocking control module has a key comparison unit for comparing the unlocking key information with the data key information.

Another technical means of the present invention is that the above-mentioned key generation module further has an unlocking end discretization chaotic unit, and the unlocking end discretization chaotic unit generates an unlocking end random information to provide the unlocking end dynamic password generating unit. Generate the dynamic password.

A further technical means of the present invention is that the data unlocking control module has a data-discrete chaotic unit, and the discretized chaotic unit generates a data-end random information to provide the data-side dynamic password generating unit. Generate the dynamic password.

Another technical means of the present invention is that the data unlocking control module has a chaotic synchronization control unit, and the unlocking chaotic unit of the unlocking end generates a synchronization information, and the chaotic synchronization control unit controls the discretization of the data end. The chaotic unit is synchronized with the unlocking chaotic unit of the unlocking end.

Another object of the present invention is to provide a remote control method for a flash drive device, which is applicable to the above-mentioned flash drive device, and includes a channel cut-off step, a device connection step, an unlock requirement step, a key encryption step, and a Key decryption step, and a key comparison step.

First perform the channel cut-off step, the data unlock control The module cuts off the external connection channel of the data access module, so that the computer device cannot access the data access module.

Then, the device connecting step is performed, the data storage device is physically connected to the computer device, and the data unlocking control module senses that the data storage device is physically connected to the computer device.

Then, the unlocking request step is performed, and the data unlocking control module of the data storage device sends out an unlocking demand information by using the data terminal wireless transceiver module.

Then, the key encryption step is performed, and the unlocking wireless transceiver module transmits the received unlocking demand information to the key generation module, and the encryption unit encrypts the pre-stored unlocked key information into the encrypted key information. And is issued by the unlocking end wireless transceiver module.

Then, the key decryption step is performed, and the data transceiver module transmits the received encryption key information to the data unlock control module, and the decryption unit decrypts the encryption key information.

Finally, the key comparison step is performed, and the key comparison unit compares the decrypted unlock key information with the data key information, and the unlocked key information matches the data key information. The data unlocking control module turns on the externally connected channel of the data access module, so that the computer device can access the data access module.

Another technical means of the novel is that the above-mentioned key encryption step further includes the following sub-steps:

First, the demand information receiving step is performed, and the unlocking end wireless transceiver module of the remote unlocking device transmits the received unlocking demand information to the key generating module.

Then, the chaotic information generating step is performed, and the unlocking unit discretizes the chaotic unit to generate the unlocking end random information and the synchronization information.

Then, a dynamic password generating step is performed, and the unlocking end dynamic password generating unit generates the dynamic password by using the unlocking end random information.

Then, an information encryption step is performed, and the encryption unit encrypts the unlocked key information by using the dynamic password, and becomes the encryption key information.

Then, the synchronization information transmission step is performed, and the unlocking wireless transceiver module sends the synchronization information to the outside.

Finally, the encryption information transmission step is performed, and the unlocking wireless transceiver module sends the encryption key information to the outside.

A further technical means of the present invention is that the above-described key decryption step further comprises the following sub-steps:

First, the information receiving step is performed, and the data receiving and receiving the synchronization information and the encryption key information are respectively transmitted to the chaotic synchronization control unit and the unlocking end dynamic password generating unit.

Then, the chaotic synchronization control step is executed, and the chaotic synchronization control unit controls the discretization chaotic unit of the data end to synchronize with the discretized chaotic unit of the unlocking end according to the synchronization information.

Then, the chaotic information generating step is performed, and the data discretizing chaotic unit generates the data end random information and transmits the data to the unlocking end dynamic password generating unit.

Then, a dynamic password generating step is executed, and the unlocking end dynamic password generating unit generates the dynamic password by using the data end random information.

Finally, the information decryption step is performed, and the decryption unit decrypts the encryption key information by using the dynamic password to obtain the unlocked key information, and transmits the unlocked key information to the key comparison unit.

The beneficial function of the present invention is that the data unlocking control module of the data storage device first cuts off the channel of the external information connection of the data access module, and prevents the computer device from accessing the data in the data access module, and Using the data end to discretize the data-end random information generated by the chaotic unit, the unlocked password is always changed, the security mechanism of the flash drive is prevented from being cracked, and the remote unlocking device is further used to generate the random information synchronized with the data end. Unlock random information and transmit the correct encryption key information The data storage device can be accessed by controlling the channel of the external information connection of the data access module to provide the computer information access data.

A‧‧‧ computer device

3‧‧‧Data storage device

31‧‧‧ Data Access Module

32‧‧‧Data unlock control module

321‧‧‧Chaotic synchronization control unit

322‧‧‧ Data-side discretization chaotic unit

323‧‧‧Data side dynamic password generation unit

324‧‧‧Decryption unit

325‧‧‧Key Comparison Unit

326‧‧‧ Data-side information

327‧‧‧Data-end random information

328‧‧‧Electronic switch

329‧‧‧Unlock demand information

33‧‧‧Data terminal wireless transceiver module

34‧‧‧Access interface

5‧‧‧ Remote unlocking device

51‧‧‧Unlocked wireless transceiver module

52‧‧‧Key Generation Module

521‧‧‧Unlocked Discretized Chaotic Unit

522‧‧‧Unlocked Dynamic Password Generation Unit

523‧‧‧Encryption unit

524‧‧‧Unlocked Key Information

525‧‧‧Encryption Key Information

526‧‧‧Unlocked random information

527‧‧‧Synchronized information

528‧‧‧ Dynamic Password

910~960‧‧‧Steps

941~946‧‧‧substeps

951~955‧‧‧substeps

1 is a schematic view showing a data security device and a method thereof according to the conventional Taiwan invention patent No. I325113; FIG. 2 is a block diagram showing a preferred embodiment of the novel flash drive device; FIG. 3 is a block diagram. A remote unlocking device of the preferred embodiment; FIG. 4 is a block diagram showing a data storage device of the preferred embodiment; FIG. 5 is a schematic diagram showing a portable disk device of the preferred embodiment. Remote control method; FIG. 6 is a schematic diagram showing a substep of a key encryption step of the preferred embodiment; and FIG. 7 is a schematic diagram showing a substep of the key decryption step of the preferred embodiment. .

The details of the related patents and the technical contents of the present invention will be clearly shown in the following detailed description of the preferred embodiments with reference to the drawings.

Referring to Figures 2, 3 and 4, a portable flash drive device is provided for accessing digital data by a computer device A, and includes a data storage device 3 and a remote unlocking device 5.

The data storage device 3 is detachably connected to the computer device A, and includes a data access module 31 for reading and writing the computer device A, and a data unlocking control electrically connected to the data access module 31. The module 32, and a data terminal wireless transceiver module 33 electrically connected to the data unlocking control module 32, the data unlocking control module 32 has a chaotic Step control unit 321, a data discretization chaotic unit 322, a data dynamic code generation unit 323, a decryption unit 324, and a key comparison unit 325, and the data unlock control module 32 prestores a data terminal gold. Key information 326.

The remote unlocking device 5 includes an unlocking wireless transceiver module 51 connected to the data transceiver module 33, and a key generating module 52 electrically connected to the unlocking wireless transceiver module 51. The key generation module 52 has an unlocking end discretization chaotic unit 521, an unlocking end dynamic password generating unit 522, and an encryption unit 523, and an unlocking end key information 524 is prestored in the key generating module 52.

The encryption unit 523 of the key generation module 52 encrypts the unlocked key information 524 into an encryption key information 525 and transmits it to the data unlock control module 32. The decryption unit 324 of the data unlock control module 32 will The encryption key information 525 is decrypted and restored to the unlocked key information 524, and the key comparison unit 325 compares the unlocked key information 524 with the data key information 326 to determine the far Whether the unlocking key information 524 sent by the end unlocking device 5 is correct, so that the data unlocking control module 32 controls whether the data of the data access module 31 provides the computer device A for reading and writing digital information.

The novel creator emphasizes that, in the preferred embodiment, the unlocking end discretization chaotic unit 521 and the data end discretization chaotic unit 322 are chaotic theory numerical generators, and the unlocking end discretizes the chaotic unit 521. An unlocking end random information 526 is generated, and the data end discretizing chaotic unit 322 generates a data end random information 327.

Among them, Chaos theory is about the nonlinear entanglement of bifurcation, periodic motion and aperiodic motion under certain parameters, which can lead to the theory of some aperiodic ordered motion. It has many characteristics such as nonlinearity and sensitivity to initial conditions.

Therefore, in the preferred embodiment, the unlocking end is discretized The chaotic unit 521 is the same as the value generating parameter set by the data discretizing chaotic unit 322. The unlocking discretizing chaotic unit 521 and the data discretizing chaotic unit 322 must also be synchronized to generate The unlock end random information 526 is the same as the data end random information 327.

Therefore, when the unlocking end discretization unit 521 generates the unlocking end random information 526, a synchronization information 527 must be generated and transmitted to the chaotic synchronization control unit 321 of the data unlocking control module 32 for regulating the data end. The discretized chaotic unit 322 is synchronized to the data discretizing chaotic unit 322 and the unlocking discretizing chaotic unit 521.

The unlocking end discretization unit 521 generates the unlocking end random information 526, and transmits the unlocking end dynamic password generating unit 522 to the unlocking end dynamic password generating unit 522 to calculate a dynamic password 528, and then provides the encryption unit 523. The unlocked key information 524 is encrypted into the encrypted key information 525.

The data end random information 327 generated by the data discretizing chaotic unit 322 is transmitted to the data side dynamic password generating unit 323, and the data side dynamic password generating unit 323 calculates the dynamic password 528, and then provides the decrypting unit 324 to provide the The encryption key information 525 is restored to the unlocking key information 524. Since the unlocking end random information 526 is the same as the data end random information 327, the data end dynamic password generating unit 323 calculates and restores the dynamic password 528 to The decryption unit 324 is provided to successfully restore the encryption key information 525 to the unlocked key information 524.

The data access module 31 is a portable disk (including a read/write chip and a memory chip, etc.) for storing digital information, and the data storage device 3 further includes an access interface for providing electrical connection of the computer device. 34. Preferably, the access interface 34 is a data access interface of the USB. The data unlocking control module 32 further includes an electronic switch 328 disposed between the access interface 34 and the data access module 31.

When the key matching unit 325 does not confirm that the unlocking end random information 526 is the same as the data end random information 327, the electronic switch 328 of the data unlocking control module 32 is turned off, and the access interface 34 and the data access are accessed. The module 31 is disconnected to prevent the computer device A from accessing the data access module 31. When it is determined that the unlocking end random information 526 is the same as the data end random information 327, the electronic switch 328 is turned on to control the access interface 34 to be electrically connected to the data access module 31, so that the computer device A can The data access module 31 performs reading and writing of digital information.

Referring to FIG. 5, a remote control method for a flash drive device is applied to the preferred embodiment, and includes a channel cutoff step 910, a device connection step 920, an unlock requirement step 930, and a key encryption step 940. A key decryption step 950, and a key comparison step 960.

First, the channel cut-off step 910 is performed, and the data unlocking control module 32 can control the on/off of the electronic switch 328. When the key comparison unit 325 does not confirm the data terminal key information 326 and the unlocking terminal key information. When the 524 is the same, the electronic switch 328 is turned off to cut off the external connection channel of the data access module 31, so that the computer device A can prevent the data access module 31 from accessing the data.

Then, the device connection step 920 is executed, the data storage device 3 is physically connected to the computer device A, and the electronic device 328 is in an off state, so that the computer device A cannot be electrically connected to the data access module 31. connection. The data unlocking control module 32 senses that the data storage device 3 is physically connected to the computer device A. Generally, the power supply itself does not have a power supply, and the internal electronic components must rely on the computer device A to provide power. When the data storage device 3 is inserted into the computer device A, the data unlocking control module 32 is first electrically connected to the computer device A, and obtains the power of the computer device A to drive the data unlocking control module 32. Electronic parts.

Then performing the unlocking requirement step 930, the data storage After the data unlocking control module 32 of the device 3 is electrically connected to the computer device A, it is determined that the data storage device 3 is inserted into the computer device A, and then the unlocking demand information 329 is continuously issued by the data terminal wireless transceiver module 33. .

Referring to FIG. 6 , the key encryption step 940 is performed. The unlocking wireless transceiver module 51 continuously receives the wireless information of the outside world. When the unlocking wireless transceiver module 51 receives the unlocking demand information 329 , the unlocking is performed. The demand information 329 is transmitted to the key generation module 52, and the key generation module 52 activates a key encryption program, and the encryption unit 523 encrypts the pre-stored unlocked key information 524 into the encryption key information 525. Then, the unlocking end wireless transceiver module 51 sends out. The key encryption step 940 further includes the following sub-steps:

First, the sub-step 1 request information receiving step 941 is performed. When the unlocking end wireless transceiver module 51 of the remote unlocking device 5 receives the unlocking demand information 329, the unlocking demand information 329 is transmitted to the key generating module 52. .

Then, the sub-step chaos information generation step 942 is executed, the unlocking end discretization chaotic unit 521 generates the unlocking end random information 526, and the synchronization information 527, and transmits the unlocking end random information 526 to the unlocking end dynamic password generating unit. 522. The synchronization information 527 is transmitted to the unlocking end wireless transceiver module 51.

Then, the sub-step-dynamic password generating step 943 is executed. The unlocking-end dynamic password generating unit 522 uses the unlocking-end random information 526 to calculate and generate the dynamic password 528, and transmits the dynamic password 528 to the encrypting unit 523.

Then, the sub-step 1 information encryption step 944 is performed. The encryption unit 523 encrypts the unlocked key information 524 by using the dynamic password 528, and becomes the encrypted key information 525, and transmits the encrypted key information 525 to the unlocked wireless transceiver module 51.

Then performing sub-step-synchronization information transmission step 945, The unlocking end wireless transceiver module 51 sends the synchronization information 527 to the outside.

Then, the sub-step one encryption information transmission step 946 is executed, and the unlocking end wireless transceiver module 51 sends the encryption key information 525 to the outside.

Referring to FIG. 7, the key decryption step 950 is executed. When the data transceiver module 33 receives the wireless information of the outside world, the unlocking demand information 329 is stopped. The encryption key information 525 is transmitted to the data unlock control module 32, and the decryption unit 324 decrypts the encryption key information 525 to be restored to the unlocked key information 524. The key decryption step 950 further includes the following sub-steps:

First, the sub-step 1 information receiving step 951 is performed. When the data transceiver module 33 continuously outputs the unlock demand information 329, the wireless information is received at the same time to obtain the required wireless information, and the data terminal is wireless. When receiving the synchronization information 527 and the encryption key information 525, the transceiver module 33 transmits the synchronization information to the chaotic synchronization control unit 321 and the unlocked dynamic password generating unit 522, respectively.

Next, a sub-step-chaotic synchronization control step 952 is performed. The chaotic synchronization control unit 321 controls the operation clock of the discretization chaotic unit 322 according to the synchronization information 527, so that the data end discretizes the chaotic unit 322 and unlocks the data unit. The end discretization chaotic unit 521 is synchronized.

Then, the sub-step chaotic information generating step 953 is executed, and the data discretizing chaotic unit 322 generates the data end random information 327 and transmits the data to the unlocking end dynamic password generating unit 522, because the data end discretizes the chaotic unit 322 and the The unlocking discretization chaotic unit 521 is synchronized, and the data end random information 327 should be identical to the unlocking end random information 526.

Then, a sub-step-dynamic password generating step 954 is performed. The unlocking-end dynamic password generating unit 522 uses the data-end random information 327 to calculate and generate the dynamic password 528, and transmits the dynamic password 528. To the decryption unit 324.

Then, a sub-step-information decryption step 955 is performed. The decryption unit 324 decrypts the encryption key information 525 by using the dynamic password 528 to obtain the unlock-end key information 524, and transmits the unlock-end key information 524 to The key is compared to unit 325.

Finally, the key comparison step 960 is executed, and the key comparison unit 325 compares the unlocked key information 524 obtained by decrypting with the data key information 326, when the unlocked key information 524 and the key When the data key information 326 is matched, the electronic switch 328 of the data unlocking control module 32 turns on the channel between the data access module 31 and the access interface, so that the computer device A can store the data. The module 31 is taken to perform an access operation of digital information.

The novel creator should emphasize that the present invention utilizes a numerical generator with a fuzzy system to perform encryption/decryption of the key, so that the information of the unlocking key of the data unlocking control module 32 is changed at any time, even if the data is unlocked. The control module 32 is cracked by the intent of the person concerned, and cannot use the exhaustive method to crack the key information.

As can be seen from the above description, the present invention does have the following effects:

First, effectively isolate the computer:

When the key matching unit 325 does not confirm that the data terminal key information 326 is the same as the unlocking terminal key information 524, the electronic switch 328 is controlled to be turned off to cut off the externally connected channel of the data access module 31. The computer device A is prevented from accessing the data access module 31.

Second, can not be cracked:

Because the new system uses a fuzzy system, the encryption key information 525 required for unlocking is changed at any time, that is, the user invades the data unlock control module 32, and the correct unlock key cannot be cracked.

Third, reduce manufacturing costs:

The present invention does not need to be additionally provided on the data storage device 3, and the password input chip or component is provided, and the corresponding key generation module 52 (APP application) can be installed on a general mobile phone or tablet device, thereby effectively preventing the Computer device A accesses digital information to reduce manufacturing costs.

In summary, the present invention first cuts off the channel of the external information connection of the data access module 31, and uses an innovative password authentication mechanism to prevent the computer device A from accessing the data in the data access module 31. And using the data end to discretize the data end random information 327 generated by the chaotic unit 322, so that the encryption key information 525 is always changing, and the remote unlocking device 5 is further used to generate the synchronization with the data end random information 327. Unlocking the random information 526 and transmitting the correct encryption key information 525 to the data storage device 3 to control the channel of the external information connection of the data access module 31 to be turned on, so that the computer device A stores the digital information. Take, so it can achieve the purpose of new cost.

However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention cannot be limited thereto, that is, the simple equivalent change and modification made by the novel patent application scope and the novel description content, All remain within the scope of this new patent.

A‧‧‧ computer device

31‧‧‧ Data Access Module

32‧‧‧Data unlock control module

33‧‧‧Data terminal wireless transceiver module

34‧‧‧Access interface

Claims (7)

A portable disk device for accessing digital data by a computer device, comprising: a data storage device detachably connected to the computer device, and including a data access module for reading and writing by the computer device, a data unlocking control module electrically connected to the data access module, and a data terminal wireless transceiver module electrically connected to the data unlocking control module, the data unlocking control module has a decrypting unit, and pre-stores one Data terminal information; and a remote unlocking device, comprising: an unlocking wireless transceiver module connected to the data wireless transceiver module information, and a key generating module electrically connected to the unlocking wireless transceiver module The key generation module has an encryption unit and prestores an unlock key information; the encryption unit of the key generation module encrypts the unlock key information into an encryption key information, and transmits the information to the data. Unlocking the control module, the decryption unit of the data unlocking control module decrypts the encryption key information, and compares with the data key information to control the data access Providing the computer apparatus group is to read and write information. According to the portable device of claim 1, wherein the key generation module further has an unlocking end dynamic password generating unit, and the unlocking end dynamic password generating unit calculates a dynamic password to provide the encryption unit. The unlocked key information is encrypted into the encrypted key information. According to the portable disk device of claim 2, wherein the data unlocking control module further has a data dynamic password generating unit, The data dynamic password generating unit calculates the dynamic password to provide the decrypting unit to restore the encrypted key information to the unlocked key information. According to the portable device of claim 3, the data unlocking control module further has a key comparison unit for comparing the unlocking key information with the data key information. According to the portable device of claim 4, wherein the key generation module further has an unlocking end discretization chaotic unit, and the unlocking end discretization chaotic unit generates an unlocking end random information to provide the unlocking end. The dynamic password generating unit generates the dynamic password. According to the portable disk device of claim 5, wherein the data unlocking control module further has a data-discrete chaotic unit, and the data-discreting chaotic unit generates a data-end random information to provide the data end. The dynamic password generating unit generates the dynamic password. According to the portable disk device of claim 6, wherein the data unlocking control module further has a chaotic synchronization control unit, and the unlocking discretizing chaotic unit further generates a synchronization information, and the chaotic synchronization control unit controls the The discretized chaotic unit at the data end is synchronized with the discretized chaotic unit at the unlocking end.