CN107909135B - USB flash disk capable of preventing data leakage - Google Patents
USB flash disk capable of preventing data leakage Download PDFInfo
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- CN107909135B CN107909135B CN201710972826.8A CN201710972826A CN107909135B CN 107909135 B CN107909135 B CN 107909135B CN 201710972826 A CN201710972826 A CN 201710972826A CN 107909135 B CN107909135 B CN 107909135B
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- patch
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- circuit
- disk body
- flash disk
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/0772—Physical layout of the record carrier
- G06K19/07732—Physical layout of the record carrier the record carrier having a housing or construction similar to well-known portable memory devices, such as SD cards, USB or memory sticks
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/70—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer
- G06F21/78—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure storage of data
- G06F21/79—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure storage of data in semiconductor storage media, e.g. directly-addressable memories
Abstract
The utility model provides a USB flash disk that can prevent data leakage, including the USB flash disk body, there is a square recess in the front middle part of component box, there is a spout at the both ends of square recess respectively, there are twelve square openings at certain interval in the square recess, by first and second cipher circuit and password slide constitute, first and second cipher circuit install on the circuit board and install the circuit board in the component box, the probe of first and second cipher circuit is located the twelve square openings of the square recess in the front middle part of component box respectively, six square openings have on the password slide, the spout at both ends about square recess in the front middle part of component box is inserted to the left and right sides of password slide, connect through the circuit board wiring between first password and second cipher circuit, USB socket of USB flash disk body and the inside original circuit of USB flash disk body shell. The password sliding plate and the USB flash disk body are stored separately, and each set of password sliding plate and the USB flash disk body has different passwords, so that the content of the USB flash disk body storage can be effectively prevented from being read, and a good confidentiality effect is achieved.
Description
Technical Field
The invention relates to the field of computer matching parts, in particular to a USB flash disk capable of preventing data leakage.
Background
The U disk is convenient to use and carry due to large information storage quantity, and has very wide application. However, the existing usb disk has a disadvantage that the usb disk itself does not have a function of preventing others from illegally reading the internal storage information, and if the other people obtain the usb disk due to loss or other reasons, the content in the usb disk can be easily read, which may cause the owner to compromise various business information or other personal information. Based on the above, it is especially necessary to provide a USB flash disk that can effectively prevent the leakage of the stored content and is convenient to operate.
Disclosure of Invention
In order to overcome the defect that the prior USB flash disk is easy to leak, the invention provides a USB flash disk which is characterized in that a plurality of photodiodes and photoresistors are arranged in the front middle part of a shell of the USB flash disk body and used as password probes, patch electronic elements are adopted in the USB flash disk body, the structure is small, the USB flash disk body is matched with a password sliding plate separated from the USB flash disk body, the USB flash disk body and the password sliding plate are stored separately (for example, the password sliding plate is independently hung on a key ring), when the USB flash disk is used, after the USB flash disk body and the password sliding plate are combined, if the password sequence formed by combining the USB flash disk body and the password sliding plate is correct, under the action of a related circuit, the internal memory of the USB flash disk body can obtain a normal read-write function through a computer USB socket, and if the USB flash disk body is lost, and because the USB flash disk body and the password sliding plate are divided into two independent parts, the password sequence formed by each USB flash disk body and the password sliding plate is inconsistent, no user can not get electricity because the password sliding plate is not used, or the password sequence of the password sliding plate is inaccurate, so that other people can not read the internal memory of the USB flash disk body through a computer, thereby the content of the internal memory of the USB flash disk can not leak information.
The technical scheme adopted for solving the technical problems is as follows:
a U disk capable of preventing data leakage comprises a U disk body, and is characterized in that the right part of the outer shell of the U disk body is provided with an element box which is integrally formed with the outer shell of the U disk body during manufacturing, the right side end of the element box is provided with a circular ring which is used as an element box hanging ring, the upper and lower widths of the element box are consistent with the upper and lower widths of the outer shell of the U disk body, the front middle part of the element box is provided with a square groove, two ends of the square groove are respectively provided with a chute, a certain distance is arranged in the square groove, the lead wire connected with the original circuit in the outer shell of the U disk body and the positive power supply input end of the USB socket of the U disk body is disconnected, the U disk body consists of a first password circuit, a second password circuit and a password slide plate, the first password circuit and the second password circuit are arranged on a circuit board and are arranged in the element box, after the circuit board is arranged, sealing glue is encapsulated in the element box, the probe of the first password circuit and the probe of the second password circuit are respectively positioned in twelve square openings of the square groove in the front middle of the element box, the sealant can not shield the probe of the first password circuit and the probe light-receiving surface of the second password circuit, the upper end of the password sliding plate is provided with a circular ring as a sliding plate hanging ring, six square openings are arranged on the password sliding plate, the left end and the right end of the password sliding plate are inserted into sliding grooves at the left end and the right end of the square groove in the front middle of the element box, the first password circuit, the second password circuit, the USB socket of the USB flash disk body and the original circuit in the shell of the USB flash disk body are connected through circuit board wiring, the positive power input end of the USB socket of the USB flash disk body is connected with the positive power input end of the first password circuit and the positive power input end of the second password circuit, the signal output end of the first password circuit is connected with the signal input end of the second password circuit, the USB interface negative power input end of the USB flash disk body is connected with the negative power input end of the second password circuit, the positive power output end of the second password circuit is connected with the positive power input end of the original circuit inside the USB flash disk body, and the password sliding plate and the USB flash disk body are stored separately.
The USB socket of the USB flash disk body is consistent with the existing common USB flash disk in appearance and size, and the shell of the USB flash disk body is larger than the existing common USB flash disk in appearance.
The first password circuit consists of a patch resistor, a probe and patch NPN triodes, wherein the probe is connected with the patch resistor through wiring of a circuit board, the number of the patch photodiodes is six, the number of the patch resistors is two, the six patch photodiodes are respectively positioned in six square openings of a square groove in the front middle of the element box, the upper parts of the six patch photodiodes are consistent with the upper horizontal positions of the groove, the six patch photodiodes of each set of first password circuit are arranged on the circuit board in inconsistent positions, different positions of the six patch photodiodes form different position sequence passwords, the anodes of the six patch photodiodes are connected, the cathodes of the six patch photodiodes are connected with one end of a first patch resistor and the base of the patch NPN triode, the other end of the first patch resistor is connected with the collector of the patch NPN triode, and the emitter of the patch NPN triode is connected with one end of a second patch resistor.
The second password circuit comprises a probe and a patch NPN triode, wherein the probe and the patch NPN triode are connected through a circuit board, the probe is a patch photo resistor, six patch photo resistors are respectively arranged in six other square openings of a square groove in the front middle of the element box, the upper parts of the six patch photo resistors are consistent with the horizontal positions of the upper parts of the groove, six patch photo resistors of each second password circuit are arranged on the circuit board in different positions, different positions of the six patch photo resistors form different passwords in sequence, all six patch NPN triode emitters are connected, one end of the first patch NPN triode is connected with a base electrode of the first patch NPN triode, one end of the first patch photo resistor is connected with one end of the second patch photo resistor, the other end of the second patch photo resistor is connected with a base electrode of the second patch NPN triode, the other end of the third patch photo resistor is connected with a base electrode of the third patch photo resistor, the other end of the third patch photo resistor is connected with the other end of the third patch NPN triode, the other end of the fourth patch NPN triode is connected with the other end of the fifth patch NPN triode, the other end of the fourth patch NPN triode is connected with the other end of the fourth patch NPN triode.
Six square openings are formed in the password sliding plate, and the square openings of each password sliding plate are different in position.
After the left end and the right end of the password sliding plate are inserted into the sliding grooves at the left end and the right end of the square groove in the front middle of the element box, the six square openings on the password sliding plate are just positioned at the upper ends of the six patch photoresistors of the second password circuit, external light can irradiate on the light receiving surfaces of the six patch photoresistors through the six square openings, and the rest parts of the password sliding plate just shield the light receiving surfaces of the six patch photoresistors of the first password circuit, so that external light cannot irradiate on the light receiving surfaces of the six patch photoresistors.
Six square openings on the password slide, the square opening position of every set of password slide is different, and six paster photodiodes of every set of first password circuit are installed on the circuit board and are located inconsistent in position, and six paster photoresistors of every set of second password circuit are installed on the circuit board, and six square openings on every set of password slide just are located the upper end of six paster photoresistors of second password circuit, and the other positions of every set of password slide just shield six paster photodiodes light-receiving surface of first password circuit, and the first password circuit of every set, second password circuit and password slide jointly form independent password.
The invention has the beneficial effects that: before the invention is used, the password sliding plate is inserted into the sliding grooves at the left end and the right end of the square groove in the front middle part of the element box, then the USB socket of the USB flash disk body is inserted into the USB socket of the computer host, and each set of the invention has different passwords, namely, each set of six patch photodiodes, six patch photoresistors and matched password sliding plate which are arranged at different positions on the circuit board can be normally used. Under normal conditions, the rest parts of each set of cipher slide board just shield the light receiving surfaces of the six patch photodiodes of the first cipher circuit, so that the light receiving surfaces of the six patch photodiodes of the first cipher circuit can output power signals to enter the subsequent second cipher circuit under the action of the internal circuit because the light receiving surfaces of the six patch photodiodes of the first cipher circuit are not illuminated; after the voltage signal input end of the second password circuit inputs the voltage signal, because the six square openings on the password sliding plate are just positioned at the upper ends of the six patch photoresistors of the second password circuit, external light (comprising lamplight at night) can irradiate on the light receiving surfaces of the six patch photoresistors through the six square openings, and therefore, the light receiving surfaces of the six patch photoresistors of the second password circuit in use can output power under the effect of the internal circuit of the user to enter the positive power input end of the original circuit in the U disk body shell due to the illumination effect, and the user can normally read the content stored in the original circuit memory in the U disk body shell. If the USB flash disk body is lost, because the user stores the password sliding plate and the USB flash disk body separately, other people do not have the password sliding plate matched with the password sliding plate, and other people cannot know the correct positions of the six square openings on the password sliding plate,
if other password sliding plates with different square opening positions are inserted into sliding grooves at the left end and the right end of a square groove in the front middle part of the element box, as long as a light receiving surface of one patch photodiode in a first password circuit is not covered, a subsequent second password circuit cannot obtain an input voltage signal, and the original circuit in the U disk body shell cannot be electrified to work, and other people cannot read the content in the original circuit memory in the U disk body shell; in actual use, if someone else shields the openings of the password sliding plate completely, although the voltage signal output by the first password circuit can enter the voltage signal input end of the second password circuit, as long as the light receiving surface of the patch photoresistor of one second password circuit is shielded from illumination, under the action of the internal circuit of the second password circuit, the second password circuit can disconnect the positive input power supply of the original circuit in the U disk body shell, so that the content of the internal memory of the original circuit in the U disk body shell is prevented from being read by someone else. Each set of the invention is provided with a first cipher circuit patch photosensitive diode, a second cipher circuit patch photosensitive resistor, a cipher slide plate and six opening positions, so that each set of the invention is provided with different ciphers; because each set of the invention has different passwords, others cannot read the content of the original circuit memory in the U disk body shell, and because others do not know the passwords, the invention can effectively prevent the content of the original circuit memory in the U disk body shell from being read, thereby playing a good confidentiality role. Based on the above, the invention has good application prospect.
Drawings
The invention is further described below with reference to the drawings and examples.
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a circuit diagram of the present invention.
Detailed Description
The U disk capable of preventing data leakage shown in figure 1 comprises a U disk body 1, wherein the right part of the shell of the U disk body 1 is provided with an element box 2 which is integrally formed with the shell of the U disk body during manufacturing, the right side end of the element box 2 is provided with a circular ring 2-1 which is used as an element box hanging ring, the upper and lower width of the element box 2 is consistent with the upper and lower width of the shell of the U disk body 1, the front middle part of the element box 2 is provided with a square groove 2-2, two ends of the square groove 2-2 are respectively provided with a chute, twelve square openings 2-3 are arranged in the square groove 2-2 at intervals, a lead wire connected with the original circuit inside the shell of the U disk body 1 and the positive power input end of the U disk body USB socket 1-1 is disconnected, the U disk is composed of a first password circuit 3, a second password circuit 4 and a password slide plate 5, after the circuit board is mounted in the element box 2, sealing glue is filled in the element box 2, the probes of the first password circuit 3 and the probes of the second password circuit 4 are respectively positioned in twelve square openings 2-3 of a square groove 2-2 in the upper middle of the element box, the sealing glue can not shield the light receiving surfaces of the probes of the first password circuit 3 and the probes of the second password circuit 4, a circular ring 5-1 is arranged at the upper end of the password sliding plate 5 and used as a sliding plate hanging ring, six square openings 5-2 are arranged on the password sliding plate 5, the left end and the right end of the password sliding plate 5 are inserted into sliding grooves at the left end and the right end of the square groove 2-2 in the front of the element box, and the first password circuit 3, the second password circuit 4, the USB socket 1-1 of the USB flash disk body 1 and the original circuit inside the shell of the USB flash disk body 1 are connected through wiring of a circuit board, the positive power input end of the USB socket of the USB flash disk body 1 is connected with the positive power input end of the first password circuit 3 and the positive power input end of the second password circuit 4, the signal output end of the first password circuit 3 is connected with the signal input end of the second password circuit 4, the negative power input end of the USB socket 1-1 of the USB flash disk body 1 is connected with the negative power input end of the second password circuit 4, the positive power output end of the second password circuit 4 is connected with the positive power input end of the original circuit inside the shell of the USB flash disk body 1, and the password sliding plate 5 and a user of the USB flash disk body 1 are stored separately. Six square openings 5-2 are arranged on the code sliding plate 5, and the positions of the square openings 5-2 of each set of code sliding plate 5 are different. After the left end and the right end of the password sliding plate 5 are inserted into the sliding grooves at the left end and the right end of the square groove 2-2 in the front middle of the element box, the six square openings 5-2 on the password sliding plate are just positioned at the upper ends of the six patch photo resistors of the second password circuit 4, external light can irradiate on the light receiving surfaces of the six patch photo resistors through the six square openings 5-2, the rest parts of the password sliding plate 5 just shield the light receiving surfaces of the six patch photo diodes of the first password circuit 3, and external light cannot irradiate on the light receiving surfaces of the six patch photo diodes. Six square openings 5-2 on the password sliding plate, the square openings 5-2 on each set of password sliding plate are different in position, six patch photodiodes of each set of first password circuit 3 are arranged on the circuit board in different positions, six patch photoresistors of each set of second password circuit 4 are arranged on the circuit board in different positions, the six square openings on each set of password sliding plate 5 are just positioned at the upper ends of the six patch photoresistors of the second password circuit 4, and after the light receiving surfaces of the six patch photoresistors of the first password circuit 3 are just shielded by the rest parts of each set of password sliding plate 5, the first password circuit 3, the second password circuit 4 and the password sliding plate 5 of each set form independent passwords together.
In fig. 1, the main body 1 of the usb disk and the code sliding plate 5 are separately stored (for example, the code sliding plate 5 and the main body 1 of the usb disk are separately hung on a key ring through respective hanging rings) in the invention. When the password sliding plate 5 is used, the password sliding plate 5 is inserted into the sliding grooves at the left end and the right end of the square groove 2-2 in the front middle of the element box 2, then the USB socket of the USB flash disk body is inserted into the USB socket of the computer host, and each set of the password sliding plate has different passwords, namely six patch photodiodes of the first password circuit 3, six patch photoresistors of the second password circuit 4 and the matched password sliding plate 5 which are arranged at different positions on the circuit board can be normally used. Under normal conditions, the rest of each set of password sliding plate 5 just shields the six patch-photosensitive diode light-receiving surfaces of the first password circuit 3, so that the six patch-photosensitive diode light-receiving surfaces of the first password circuit 3 can output power signals to enter the subsequent second password circuit 4 under the action of the internal circuit of the password sliding plate because the six patch-photosensitive diode light-receiving surfaces of the first password circuit 3 are not illuminated; after the voltage signal input end of the second password circuit 4 inputs the voltage signal, because the six square openings 5-2 on the password sliding plate 5 are just positioned at the upper ends of the six chip photoresistors of the second password circuit 4, external light can irradiate on the light receiving surfaces of the six chip photoresistors through the six square openings 5-2, and therefore, in use, the light receiving surfaces of the six chip photoresistors of the second password circuit 4 can output power under the action of the internal circuit of the user to enter the positive power input end of the original circuit in the shell of the U disk body 1 due to the illumination effect, and the user can read the content stored in the original circuit memory in the shell of the U disk body 1 normally. If the USB flash disk body 1 is lost, because the user stores the password sliding plate 5 and the USB flash disk body 1 separately, other people cannot know the correct positions of the six square openings 5-2 on the password sliding plate 5 without matching password sliding plates 5, if the other password sliding plates 5 with different square opening positions are inserted into the sliding grooves at the left and right ends of the square groove 2-2 in the front middle part of the element box 2, as long as the light receiving surface of one patch photodiode in the first password circuit 3 is not blocked, the subsequent second password circuit 4 cannot obtain an input voltage signal, and the original circuit in the shell of the USB flash disk body 1 cannot work, and other people cannot read the content in the original circuit memory in the shell of the USB flash disk body 1; in practical use, if someone else shields the openings of the password sliding plate 5 completely, although the voltage signal output by the first password circuit 3 can enter the voltage signal input end of the second password circuit 4, as long as the light receiving surface of the patch photoresistor of one second password circuit 4 is not shielded from illumination, under the action of the internal circuit of the second password circuit 4, the second password circuit 4 can disconnect the positive input power supply of the original circuit in the shell of the U disk body 1, so that the content of the memory in the original circuit in the shell of the U disk body 1 is prevented from being read by someone else. According to the invention, each set of the password sliding plate 5 is provided with six different opening positions corresponding to the installation positions of the first password circuit 3 patch photodiodes, the second password circuit 4 patch photoresistors, so that each set of the password sliding plate 5 is provided with different passwords; because each set of the invention has different passwords, others cannot read the content of the original circuit memory in the shell of the U disk body 1, and the passwords are not known, so that the content of the original circuit memory in the shell of the U disk body 1 can be effectively prevented from being read, and a good confidentiality effect is achieved. Based on the above, the invention has good application prospect.
In fig. 2, the USB socket of the USB disk body is identical to the existing common USB disk in shape and size, and the shell of the USB disk body is larger than the existing common USB disk in shape. The first cipher circuit consists of patch resistors R1 and R2, probes VD1, VD2, VD3, VD4, VD5 and VD6 and patch NPN triode VT1, which are connected by circuit board wiring, the probes are patch photodiodes, six patch photodiodes are provided, two patch resistors are provided, the six patch photodiodes VD1, VD2, VD3, VD4, VD5 and VD6 are respectively positioned in six square openings of square grooves at the upper middle part of the element box, the upper parts of the six patch photodiodes VD1, VD2, VD3, VD4, VD5 and VD6 are consistent with the horizontal positions at the upper parts of the grooves, the six patch photodiodes VD1, VD2, VD3, VD4, VD5 and VD6 are arranged on the circuit board in different positions, different position sequence passwords are formed at different installation positions of the six patch photodiodes VD1, VD2, VD3, VD4, VD5 and VD6, anodes of the six patch photodiodes VD1, VD2, VD3, VD4, VD5 and VD6 are connected, cathodes of the six patch photodiodes VD1, VD2, VD3, VD4 and VD5 are connected with one end of a first patch resistor R1 and a base of a patch NPN triode VT1, the other end of the first patch resistor R1 is connected with a collector of the patch NPN triode VT1, and an emitter of the patch NPN triode VT1 is connected with one end of a second patch resistor R2. The second cipher circuit is composed of probes RL1, RL2, RL3, RL4, RL5, RL6 and patch NPN triodes VT2, VT3, VT4, VT5, VT6 and VT7, wherein the probes are patch photoresistors, six patch photoresistors and patch NPN triodes are respectively arranged, the six patch photoresistors RL1, RL2, RL3, RL4, RL5 and RL6 are respectively positioned in the other six square openings of the square groove at the upper part of the element box, the upper parts of the six patch photoresistors RL1, RL2, RL3, RL4, RL5 and RL6 are consistent with the upper part of the groove, the positions of the six patch photoresistors RL1, RL2, RL3, RL4, RL5 and RL6 arranged on the circuit board are inconsistent, the different mounting positions of the six patch photoresistors RL1, RL2, RL3, RL4, RL5 and RL6 form different position ciphers, the six patch photoresistors VT2, RL3, RL4, RL5 and VT7 are connected with the emitting electrodes VT7, one end of the first patch NPN triode RL1 is connected with the base electrode of the first patch NPN triode VT2, the collector electrode of the first patch NPN triode VT2 is connected with one end of the second patch NPN triode RL2, the other end of the second patch NPN triode RL2 is connected with the base electrode of the second patch NPN triode VT3, the collector electrode of the second patch NPN triode VT3 is connected with one end of the third patch NPN triode RL3, the other end of the third patch NPN triode VT4 is connected with the base electrode of the third patch NPN triode VT4, the collector electrode of the third patch NPN triode VT4 is connected with one end of the fourth patch NPN triode RL4, the base electrode of the fourth patch NPN triode RL5 is connected with one end of the fifth patch NPN triode RL5, the other end of the fifth patch NPN triode RL5 is connected with the base electrode of the fifth patch NPN triode VT6, the collector of the fifth paster NPN triode VT6 is connected with one end of the sixth paster photoresistor RL6, and the other end of the sixth paster photoresistor RL6 is connected with the base of the sixth paster NPN triode VT 7. Six square openings are arranged on the password sliding plate, and the positions of the square openings of each set of password sliding plate are different. After the left end and the right end of the password sliding plate are inserted into the sliding grooves at the left end and the right end of the square groove in the front middle of the element box, the six square openings on the password sliding plate are just positioned at the upper ends of the six patch photo resistors RL1, RL2, RL3, RL4, RL5 and RL6 of the second password circuit, external light can irradiate on the light receiving surfaces of the six patch photo resistors RL1, RL2, RL3, RL4, RL5 and RL6 through the six square openings, the rest parts of the password sliding plate just shield the light receiving surfaces of the six patch photo diodes VD1, VD2, VD3, VD4, VD5 and VD6 of the first password circuit, and external light cannot irradiate on the light receiving surfaces of the six patch photo diodes VD1, VD2, VD3, VD4 and VD 5. Six square openings are formed in the password sliding plate, the square openings of each set of the password sliding plate are different in position, six patch photodiodes VD1, VD2, VD3, VD4, VD5 and VD6 of each set of the password sliding plate are arranged on the circuit board in an inconsistent position, six patch photodiodes RL1, RL2, RL3, RL4, RL5 and RL6 of each set of the password sliding plate are arranged on the circuit board in an inconsistent position, the six square openings of each set of the password sliding plate are just positioned at the upper ends of the six patch photodiodes RL1, RL2, RL3, RL4, RL5 and RL6 of the second password sliding plate, and after the light receiving surfaces of the six patch photodiodes VD1, VD2, VD3, VD4, VD5 and VD6 of the first password sliding plate are just shielded by the other parts of each set of the password sliding plate, the first password sliding plate, the second password sliding plate and the password sliding plate form independent passwords together.
In fig. 2, the first password circuit, the second password circuit, the USB socket of the USB disk body and the original circuit inside the external shell of the USB disk body are connected through circuit board wiring, the positive power input end J of the USB socket of the USB disk body is connected with the other end of the chip resistor R1 of the positive power input end of the first password circuit, the other end of the chip resistor R2 of the positive power input end of the second password circuit is connected with the other end of the chip resistor RL1 of the signal input end of the second password circuit, the negative power input end F of the USB socket of the USB disk body is connected with the positive electrode of the chip photodiode VD1 of the negative power input end of the second password circuit, the collector of the chip resistor VT7 of the positive power input end of the original circuit inside the external shell of the USB disk body is connected with the positive power input end G of the original circuit, and the password skateboard and the user of the USB disk body are stored separately.
Before the invention is used, the password sliding plate is inserted into the sliding grooves at the left and right ends of the square groove in the front middle part of the element box, then the USB socket of the USB flash disk body is inserted into the USB socket of the computer host, and each set of the invention has different passwords, namely six patch photosensitive diodes of the first password circuit, six patch photosensitive resistors of the second password circuit and matched password sliding plates which are arranged at different positions on the circuit board can be normally used. The first cipher circuit and the second cipher circuit are as follows: after the USB socket of the U disk body is inserted into the USB socket of the host computer, a 5V direct current power supply in the host computer enters the input end of a first password circuit and a second password circuit positive power supply through the USB socket of the U disk body, then, when a user uses the U disk body under normal conditions, as the rest parts of each set of password sliding plate just shield six patch photo diodes VD1, VD2, VD3, VD4, VD5 and VD6 light receiving surfaces, thus, six patch photo diodes VD1, VD2, VD3, VD4, VD5 and VD6 light receiving surfaces are all exposed to light to be high resistance, a patch resistor R1 is increased to the ground voltage, a patch NPN triode VT1 base electrode is properly conducted through a patch resistor R1, and then, the emitter of the patch NPN triode VT1 outputs high level, and the output high level signal is reduced to one end of the patch resistor RL1 through the resistor R2, as six square openings on the password sliding plate are just positioned on the six patch photo resistors RL1, RL2, RL3, RL4 and RL5 and RL6 light receiving surfaces just become low, the six square photo resistors RL2, RL2 and RL4 and RL6 light receiving surfaces are only become low, the light receiving surfaces of the patch resistors RL2 and RL2 are only exposed to be proper to be high, and the light receiving surfaces of the patch resistor RL2 and the patch resistor RL2 are only is exposed to be exposed to the light to be high resistance, and the light receiving surfaces of the light to be low light receiving surfaces of the light resistance to be low to be high to be light resistance. The collector output high level of the collector of the patch photo resistor RL3 enters one end of the patch photo resistor RL3, the light resistance value of the patch photo resistor RL3 becomes low, the base of the patch NPN triode VT4 can obtain a proper bias current through the patch photo resistor RL3 and then conduct, the collector output high level of the collector of the patch NPN triode VT5 can obtain a proper bias current through the patch photo resistor RL4 and then conduct, the collector output high level of the collector of the patch NPN triode VT5 enters one end of the patch photo resistor RL5, the base of the patch NPN triode VT6 can obtain a proper bias current through the patch photo resistor RL5 and then conduct, the collector output high level of the collector of the patch NPN triode VT4 enters one end of the patch photo resistor RL6 and then conduct through the patch photo resistor RL6, and the collector output high level of the collector of the patch NPN triode VT7 enters the positive power input end G of the original circuit inside the U disk body casing, and thus a user can normally operate the computer to read the content inside the original circuit memory inside the U disk body casing. If the U disk body is lost, because a user stores the password sliding plate and the U disk body separately, other people do not have matched password sliding plates, because the correct positions of six square openings on the password sliding plate cannot be known, if other password sliding plates with different square opening positions are inserted into sliding grooves at the left end and the right end of a square groove in the front middle of the element box, as long as a light receiving surface of a patch photosensitive diode in a first password circuit is not shielded, the resistance value of the patch photosensitive diode which is not shielded is low due to the illumination effect, the ground voltage of the patch resistor R1 is reduced, the base voltage of the patch NPN triode VT1 is lower than 0.7V, the collector of the patch NPN triode VT1 does not output high level to enter a subsequent second password circuit, the original circuit in the U disk body can not work electrically, and other people cannot read the content in the original circuit memory in the U disk body; in practical use, if the others block the openings of the password sliding plate completely, although the voltage signal output by the emitter of the patch NPN triode VT1 of the first password circuit can enter one end of the patch photoresistor RL1 at the voltage signal input end of the second password circuit, as long as the light receiving surface of the patch photoresistor of one second password circuit is not blocked, the light receiving surface of the patch photoresistor of the other second password circuit is not illuminated, the voltage of the base electrode input to the subsequent patch NPN triode is lower than 0.7V because the resistance value of the patch photoresistor which cannot be illuminated becomes higher, so that the subsequent patch NPN triode is in a cut-off state, and as long as the light receiving surface of the patch photoresistor of any one second password circuit is not blocked, the patch NPN triode VT7 is in the cut-off state, and the collector of the patch photoresistor of the other second password circuit does not output a power source to enter the positive power supply end input end G of the original circuit in the U disc body outer housing, so that the others can be prevented from reading the content of the original circuit in the U disc outer housing. Each set of the invention is provided with a first cipher circuit patch photosensitive diode, a second cipher circuit patch photosensitive resistor, a cipher slide plate and six opening positions, so that each set of the invention is provided with different ciphers; because each set of the invention has different passwords, others cannot read the content of the original circuit memory in the U disk body shell, and the passwords are not known, the content of the original circuit memory in the U disk body shell can be effectively prevented from being read, and the invention has good confidentiality. Based on the above, the invention has good application prospect.
Fig. 2 shows a first cipher circuit: the resistance value of the chip resistor R1 is 150K; r2 has a resistance of 1K; the probes VD1, VD2, VD3, VD4, VD5 and VD6 are PD70-01C/TR7 type patch photodiodes; the model of the patch NPN triode VT1 is S9014. In the second cryptographic circuit: the probes RL1, RL2, RL3, RL4, RL5 and RL6 are CXD-SMD023 type patch photoresistors; the model of the patch NPN triodes VT2, VT3, VT4, VT5, VT6 and VT7 is S9014.
The present embodiment is a preferred embodiment of the present invention, and is not intended to limit the present invention, but any modification, equivalent replacement, improvement, etc. within the scope of the principles of the present invention should be included in the scope of the present invention.
Claims (1)
1. A USB flash disk capable of preventing data leakage comprises a USB flash disk body, and is characterized in that the right part of the shell of the USB flash disk body is provided with an element box which is integrally formed with the USB flash disk body during manufacturing, the right side end of the element box is provided with a circular ring as an element box hanging ring, the front middle part of the element box is provided with a square groove, two ends of the square groove are respectively provided with a chute, twelve square openings are arranged in the square groove at a certain distance, a wire connected with the original circuit in the USB flash disk body shell and the positive power supply input end of a USB socket of the USB flash disk body is disconnected, the USB flash disk comprises a first password circuit, a second password circuit and a password sliding plate, the first password circuit and the second password circuit are arranged on a circuit board and are arranged in the element box, a probe of the first password circuit and a probe of the second password circuit are respectively positioned in the twelve square openings of the square groove in the front middle part of the element box, the upper end of the password sliding plate is provided with a circular ring as a sliding plate hanging ring, the password sliding plate is provided with six square openings, the left end and the right end of the password sliding plate are inserted into sliding grooves at the left end and the right end of a square groove at the front middle part of the element box, the first password circuit, the second password circuit, a USB socket of the USB flash disk body and the original circuit inside the USB flash disk body are connected through wiring of a circuit board, the positive power input end of the USB socket of the USB flash disk body is connected with the positive power input end of the first password circuit and the positive power input end of the second password circuit, the signal output end of the first password circuit is connected with the signal input end of the second password circuit, the negative power input end of the USB socket of the USB flash disk body is connected with the positive power input end of the original circuit inside the USB flash disk body, the password sliding plate and the USB flash disk body are stored separately by a user; the first password circuit consists of patch resistors, probes and patch NPN triodes, wherein the patch resistors, the probes and the patch NPN triodes are connected through wiring of a circuit board, the probes are patch photodiodes, the number of the patch photodiodes is six, the number of the patch resistors is two, the six patch photodiodes are respectively positioned in six square openings of a square groove in the front middle of the element box, the upper parts of the six patch photodiodes are consistent with the upper horizontal positions of the groove, the six patch photodiodes of each set of first password circuit are arranged on the circuit board in different positions, different positions of the six patch photodiodes form different position sequence passwords, the anodes of the six patch photodiodes are connected, the cathodes of the six patch photodiodes are connected with one end of a first patch resistor and the base electrode of the patch NPN triodes, the other end of the first patch resistor is connected with the collector electrode of the patch NPN triodes, and the emitter of the patch NPN triodes is connected with one end of a second patch resistor; the second password circuit consists of a probe and a patch NPN triode, wherein the probe and the patch NPN triode are connected through a circuit board wiring, the probe is a patch photoresistor, the patch photoresistor and the patch NPN triode are respectively six, the six patch photoresistors are respectively positioned in the other six square openings of the square groove in the front middle of the element box, the upper parts of the six patch photoresistors are consistent with the horizontal positions of the upper parts of the groove, the six patch photoresistors of each set of second password circuit are arranged on the circuit board in different positions, different positions are formed for passwords sequentially, all the six patch NPN triode emitters are connected, one end of the first patch NPN triode is connected with a base electrode of the first patch NPN triode, one end of the first patch NPN triode is connected with one end of the second patch photoresistor, the other end of the second patch photoresistor is connected with one end of the third patch photoresistor, the other end of the third patch NPN triode is connected with the other end of the third patch NPN triode, the other end of the fourth patch photoresistor is connected with the other end of the fifth patch NPN triode, and the other end of the fifth photoresistor is connected with the other end of the fifth patch NPN triode, and the fourth end of the fourth patch photoresistor is connected with the other end of the fifth patch photoresistor; six square openings on the password sliding plate, the square opening positions of each set of password sliding plate are different, six patch photodiodes of each set of first password circuit are arranged on the circuit board at different positions, six patch photoresistors of each set of second password circuit are arranged on the circuit board at different positions, the six square openings on each set of password sliding plate are just positioned at the upper ends of the six patch photoresistors of the second password circuit, the rest parts of each set of password sliding plate just shield the light receiving surfaces of the six patch photodiodes of the first password circuit, and the first password circuit, the second password circuit and the password sliding plate of each set jointly form independent passwords.
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| CN201710972826.8A CN107909135B (en) | 2017-10-18 | 2017-10-18 | USB flash disk capable of preventing data leakage |
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| CN201710972826.8A CN107909135B (en) | 2017-10-18 | 2017-10-18 | USB flash disk capable of preventing data leakage |
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