CN103390303B - Based on financial key and the control method thereof of audio frequency and USB data transmission - Google Patents
Based on financial key and the control method thereof of audio frequency and USB data transmission Download PDFInfo
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Abstract
The present invention discloses a kind of financial key based on audio frequency and USB data transmission, and comprise: audio interface, it connects external audio frequency apparatus, receives or output audio signal; USB interface, it connects external equipment, to power supply and the Signal transmissions of secret key; Sound signal change-over circuit, it connects audio interface, processes rear output to sound signal; Safety chip, it connects audio interface received audio signal by sound signal change-over circuit; And be connected to external equipment by USB interface; Battery, it is for storage of electrical energy, and powers to secret key; Battery management chip, it connects battery, carries out charge and discharge control to battery; Power control unit, it is circuit connection battery management chip, audio interface, safety chip respectively.Adopt resistance-capacitance network to instead of AD/DA module in the present invention, reduce audio frequency secret key plate face complexity, cost-saving; Command process adopts quiescent dissipation control method and dynamic power consumption control method, reduces the power consumption of system.
Description
Technical field
The present invention relates to a kind of audio frequency secret key, be specifically related to a kind of Low Power High Performance financial key based on audio frequency and USB data transmission and control method thereof.
Background technology
Developing rapidly along with Internet technology, e-commerce development is swift and violent in recent years, and the security of the particularly user's Net silver of so how guaranteeing to conclude the business, has also just become the problem that people are concerned about most.The transaction of current Based PC mainly uses USB (universal serial bus) (UniversalSerialBUS, USB) secret key (key) to ensure.USBKey is mainly used to store digital certificate, and carries out signature authentication in USBKey inside, and the key of USBKey can not be derived forever simultaneously, this ensure that the security of communication interaction.
But along with popularizing of the mobile interchange equipment such as smart mobile phone, transaction is no longer confined to the network trading of traditional Based PC, therefore, has just occurred the various safe key based on mobile interchange terminal, e.g., apple key, safe SD card and audio frequency key etc.This several key has a common weakness, and that is exactly no matter be that apple key or safe SD card are all targeted, and as apple key is suitable only for the product of apple, safe SD card then needs mobile interchange equipment to have SD(TF) interface.But we know, be that the mobile interchange such as smart mobile phone or pad equipment all has audio interface, therefore, the audio frequency key being carried out data transmission by audio interface substantially can compatible most smart mobile phone and pad etc.
Audio frequency key generally adopts lithium battery power supply, and being connected with smart mobile phone or pad by the 3.5mm audio interface of standard is realized two-way data and transmit.During communication, the microphone of smart mobile phone is as input channel, and earphone is as output channel.Compared with the key of other types, audio frequency key is high except security, outside feature easy to carry, compatible makes well it in based on the encryption and decryption application of mobile interchange equipment, have more advantage.But current audio frequency key product mostly circuit more complicated, needs to use AD and DA and change to the data doing safety chip and smart mobile phone end, this complexity just making the pcb board of key become, cause cost higher, power consumption is also higher simultaneously.The present invention proposes improvement project for these problems, and while elevator system performance, the complexity of pcb board and power consumption are obtained for and effectively reduce, and make product more press close to consumer demand.
Summary of the invention
The invention provides a kind of financial key based on audio frequency and USB data transmission and control method thereof, support that audio interface connects, USB interface connects, can be used for mobile phone, the authentication of panel computer and computer terminal and data encrypting and deciphering, low cost, low-power consumption.
For achieving the above object, the invention provides a kind of financial key based on audio frequency and USB data transmission, be characterized in, this secret key comprises:
Audio interface, it connects external audio frequency apparatus, receives or output audio signal;
USB interface, it connects external equipment, for the power supply of secret key and Signal transmissions;
Sound signal change-over circuit, it connects audio interface, processes rear output to sound signal;
Safety chip, it connects audio interface received audio signal by sound signal change-over circuit; And be connected to external equipment by USB interface;
Battery, it is for storage of electrical energy, and powers to secret key;
Battery management chip, it connects battery, carries out charge and discharge control to battery;
Power control unit, it is circuit connection battery management chip, audio interface, safety chip respectively;
When audio interface is not connected external equipment with USB interface, the Circuits System of secret key is not powered, powered-down;
When only having USB interface to connect external equipment, powered by the Circuits System of USB interface to secret key, battery management chip controls to charge to battery simultaneously;
When only having audio interface to connect external audio frequency apparatus, power control unit controls battery by battery management chip and powers to the Circuits System of secret key.
Above-mentioned power control unit also circuit is connected with linear voltage regulator, and is powered by the Circuits System of this linear voltage regulator to secret key.
Above-mentioned sound signal change-over circuit is connected by bus extender circuit with before safety chip.
Above-mentioned sound signal change-over circuit adopts resistance-capacitance network.
Above-mentioned sound signal change-over circuit comprises audio input circuit and audio output circuit;
Above-mentioned audio input circuit comprises the second electric capacity, and the two ends of the second electric capacity are connected to the L channel of safety chip input end and audio interface respectively; Between second electric capacity and safety chip input end, circuit is connected with the 3rd resistance and the 4th resistance; 3rd resistance eutral grounding, the 4th resistance connects power supply;
Above-mentioned audio output circuit comprises the second resistance and the first electric capacity that are connected in series; Second resistance connects safety chip output terminal, and the first electric capacity connects the microphone end of audio interface; Between second resistance and the first electric capacity, circuit is connected with the first resistance, this first resistance eutral grounding.
Above-mentioned power control unit comprises: the second inductance be connected in series, the 5th resistance and triode; Second inductance connects the R channel of audio interface, the base stage of the 5th resistance connecting triode; The emitter of triode connects battery management chip, and collector connects the circuit system of secret key; 5th circuit between resistance and the emitter of triode is connected with the 6th resistance.
The external equipment that above-mentioned USB interface connects comprises: computing machine, panel computer or mobile phone.
Above-mentioned secret key intercommunication and adopt Manchester's cde mode with the signal data of PERCOM peripheral communication.
A kind of quiescent dissipation control method as the above-mentioned financial key based on audio frequency and USB data transmission, be characterized in, the method comprises: when audio frequency secret key is connected to external audio frequency apparatus, the triode ON in power control unit, and now battery is to system power supply;
When audio frequency secret key, need not connect audio frequency apparatus, connect R channel one end of audio interface for open circuit, triode ends, and system is not powered.
As a dynamic power consumption control method for the above-mentioned financial key based on audio frequency and USB data transmission, be characterized in, the method comprises: in work, and the module clock that first safety chip will not used in application is closed;
And after each command process completes, safety chip enters sleep pattern, and when there being external command, safety chip wakes up by level change on bus extender again, safety chip starts to receive and processes next external command, and after external command completes, safety chip enters sleep pattern again.
The financial key and the control method thereof that the present invention is based on audio frequency and USB data transmission are compared with the audio frequency secret key of prior art, its advantage is, adopt simple resistance-capacitance network to instead of AD/DA module in the present invention, the pcb board face complexity of audio frequency secret key is reduced, the cost of 30% can be saved;
The present invention, while removing AD/DA module, adopts quiescent dissipation control method and dynamic power consumption control method by command process, reduces the power consumption of system.
Accompanying drawing explanation
Fig. 1 is the structural representation of the financial key that the present invention is based on audio frequency and USB data transmission;
Fig. 2 is the circuit diagram of the sound signal change-over circuit of the financial key that the present invention is based on audio frequency and USB data transmission;
Fig. 3 is the circuit diagram of the power control unit of the financial key that the present invention is based on audio frequency and USB data transmission;
Fig. 4 is the secret key intercommunication of the financial key that the present invention is based on audio frequency and USB data transmission and the signal data oscillogram with PERCOM peripheral communication;
Fig. 5 is the communications protocol case1 figure of the financial key that the present invention is based on audio frequency and USB data transmission;
Fig. 6 is the communications protocol case2 figure of the financial key that the present invention is based on audio frequency and USB data transmission;
Fig. 7 is the communications protocol case3 figure of the financial key that the present invention is based on audio frequency and USB data transmission;
Fig. 8 is the communications protocol case4 figure of the financial key that the present invention is based on audio frequency and USB data transmission.
Embodiment
Specific embodiments of the invention are further illustrated below in conjunction with accompanying drawing.
As shown in Figure 1, the present invention discloses a kind of financial key based on audio frequency and USB data transmission, this financial key is a kind of audio frequency secret key, it comprises: audio interface 5, USB interface 6(USB (universal serial bus), UniversalSerialBUS), sound signal change-over circuit 2, safety chip 1, battery 3, battery management chip 4, power control unit and linear voltage regulator (lowdropoutregulator, LDO).
Audio interface 5 includes L channel end, R channel end and microphone end, and it connects external audio frequency apparatus, by L channel end and R channel end received audio signal, and by microphone end (Mic) output audio signal.Audio frequency apparatus can adopt the mobile internet equipment such as mobile phone.
USB interface 6 connects external equipment, for the power supply of secret key and Signal transmissions.External equipment can be computer PC, panel computer PAD or mobile phone.
Sound signal change-over circuit 2 circuit connect audio interface 5, to through sound signal process after export.Sound intermediate frequency signaling conversion circuit 2 of the present invention adopts simple resistance-capacitance network to substitute the AD/DA module of prior art, and the audio port of mobile internet equipment is directly connected by simple resistance-capacitance network with the GPIO mouth of safety chip.
Safety chip 1 adopts model to be the safety chip of AC3192, it is by bus extender (GPIO, GeneralPurposeInputOutput, universal input/output) circuit connection sound signal change-over circuit 2, connect audio interface 5 received audio signal by sound signal change-over circuit 2.This safety chip 1 is also connected to external equipment by USB interface 6.
Battery 3 adopts lithium battery, and it is for storage of electrical energy, and powers to the sound signal change-over circuit 2 of secret key circuit system, safety chip 1, audio interface 5, USB interface 6.
Battery management chip 4 circuit connects battery 3, for carrying out charge and discharge control to battery 3.
Power control unit respectively circuit connects battery management chip 4, the R channel of audio interface 5, safety chip 1.
Linear voltage regulator is connected with power control unit circuit, and power control unit is powered to the circuit system of secret key by the input end of the LDO linear voltage regulator of 3.3V.
When audio interface 5 is not connected external equipment with USB interface 6, the Circuits System of secret key is not powered, powered-down.
When only having USB interface 6 to connect external equipment, powered by the Circuits System of USB interface 6 pairs of secret keys, battery management chip 4 controls to charge to battery 3 simultaneously.
When only having audio interface 5 to connect external audio frequency apparatus, power control unit controls battery 3 by battery management chip 4 and powers to the Circuits System of secret key.
As shown in Figure 2, in the present embodiment, sound signal change-over circuit 2 comprises audio input circuit and audio output circuit.
Audio input circuit comprises the second electric capacity C2, and the two ends of the second electric capacity C2 are connected to A_In end and A_Out end respectively, and A_In end connects safety chip 1 input end, and M_Out connects the L channel of audio interface.Between second electric capacity C2 and safety chip input end, circuit is connected with the 3rd resistance R3 and the 4th resistance R4; 3rd resistance R3 ground connection, the 4th resistance R4 meets the power vd D of 3.3V.Wherein, the second electric capacity C2 is 100nF, and the 3rd resistance R3 is 51k Ω, and the 4th resistance R4 is 51k Ω.
Audio output circuit comprises the second resistance R2 and the first electric capacity C1 that are connected in series; Second resistance R2 connects A_Out end, and A_Out end is connected to safety chip output terminal; First electric capacity C1 connects M_In end, and M_In end is connected to the microphone end of audio interface 5.Between second resistance R2 and the first electric capacity C1, circuit is connected with the first resistance R1, this first resistance R1 ground connection.Wherein the first resistance R1 and the second resistance R2 is 51k Ω, and the first electric capacity C1 is 100nF.
Because GPIO mouth exports as 3.3VVPP, in order to avoid may damaging of the audio input circuit to mobile interchange equipment, therefore adopt the first resistance R1, the second resistance R2 to do voltage division processing, just can enter the audio input port of mobile interchange equipment after removing wherein DC component by electric capacity more afterwards.
The input range of the GPIO mouth of safety chip 1 is 0-3.3V, and the audio output signal of mobile interchange equipment does not have DC component, namely have just having negative, therefore as in Fig. 2 below shown in, by the 3rd resistance R3,4th resistance R4 has superposed a DC component (1.65V) to the audio output signal of mobile interchange equipment, is beneficial to safety chip 1 and processes.When the I/O port of safety chip 1 is as input, the minimum of input high level is 2.0V, and mxm. during input low level is 0.8V, by regulating the media output volume of mobile phone, making its Vpp be greater than 1V and safety chip 1 can be made correctly to identify input signal.When using audio frequency secret key, software first can record current media volume, is adjusted to maximum afterwards by media volume, now then can ensure the normal transmitting-receiving of data during communication completely, and application terminates the size before media volume is recovered by rear software again.
As shown in Figure 3, power control unit comprises: the second inductance L 2 be connected in series, the 5th resistance R12 and triode Q1.Second inductance L 2 connects AR end, AR terminal circuit connects the R channel of audio interface 5, the base stage of the 5th resistance R12 connecting triode Q1, and the emitter of triode Q1 connects VBat end, this VBat terminal circuit connects battery management chip 4, is connected and control battery 3 by battery management chip 4.The collector of triode Q1 connects VLDO_IN end, and VLDO_IN end connects the modules in secret key circuit system by linear voltage regulator LDO.Between 5th resistance R12 and the emitter of triode Q1, circuit is connected with the 6th resistance R13.Wherein, the second inductance L 2 is 100uH, and the 5th resistance R12 is 10k Ω, and the 6th resistance R13 is 100k Ω.
When audio frequency secret key is not connected to any equipment by audio interface 5 and USB interface 6, AR end is unsettled, and now triode Q1 ends, and system is not powered.When audio frequency secret key is connected to computer PC by USB interface 6, triode Q1 ends, the power supply of system is provided by USB interface 6, now can charge to lithium battery 3. when audio frequency secret key is connected to mobile internet equipment by audio interface, triode Q1 conducting, the power supply of system is provided by lithium battery 3.
Because audio output generally has coupling capacitance, therefore exporting be continually varying signal, therefore adopts uart transmission mode in the present invention, secret key intercommunication and adopt the mode of Manchester's cde with the signal data of PERCOM peripheral communication.The waveform of as shown in Figure 4, the first half is respectively ' 0 ' and ' 1 ', the latter half is the waveform of a byte, and the waveform table registration in figure is according to 0x5A.
The communications protocol of audio frequency secret key and mobile interchange equipment: each data communication is always initiated by mobile interchange equipment end.Base unit when audio frequency secret key and mobile interchange device talk is for wrap, and often bag data is composed as follows, and wherein LOAD section maximum length is 200Bytes:
| HEAD(1 Byte) | LEN(1 Byte) | LOAD(LEN Bytes) |
The definition of LOAD section with reference to general 7816 agreements, respectively define case1, case2,4 kinds of communication modes such as case3 and case4, wherein HEAD field is data packet head, be fixed as 0xFF or 0x00, this is because some mobile phone actual recording the possibility of result can be anti-phase, during data decode, corresponding decoding process can be selected according to the HEAD field received.Len field is the total length of LOAD section in packet, is 0xC8 to the maximum.The data that LOAD section comprises for packet.
Command format is specially:
| CMD(5 byte) | XOR(1 byte) | DATA(n byte) | XOR(1 byte) |
CMD field:
| CLA | INS | P1 | P2 | LC/Le |
CLA:Class, can specifically with reference to 7816 relevant documentations.
INS:Instructions, can specifically with reference to 7816 relevant documentations.
LC(1 byte): the length sending data.The length of order head DATA below, does not comprise check code.
Le(1 byte): expect the data length returned.Do not comprise the length of CRC and the state returned.
XOR: command header part exclusive or check code totally 1 byte.
Stuff(2 byte): arbitrary data.
DATA: data, length equals LC.
XOR: data division exclusive or check code, totally 1 byte.
The form of command response is:
| DATA | STATUS | XOR(1 byte) |
DATA: the data returned.
STATUS: status word.Can specifically with reference to 7816 relevant documentations.
| SW1 | SW2 |
XOR: data division and status sections XOR value, do not comprise HEAD.
As shown in Figure 5, be case1 communication mode, this case is countless reportedly defeated, and mobile interchange equipment sends order (5Bytes), return state code after the process of audio frequency key command.
As shown in Figure 6, be case2 communication mode, the process of this case is: mobile interchange equipment sends order (5Bytes), return data and status code after the process of audio frequency key command.
As shown in Figure 7, be case3 communication mode, the process of this case is: data and order are sent to audio frequency secret key by mobile interchange equipment, the data that the process of audio frequency secret key receives and order, and return state code
As shown in Figure 8, be case4 communication mode, this case divides three parts, is the initial order stage respectively, data phase and the finish command stage.Command phase tells that audio frequency secret key follow-up data is encryption or deciphering by an order of similar case1, and with what algorithm etc., ending phase then tells that the data of this case of audio frequency secret key all process.To be with the difference of the case of three above: three case first or do not have data to transmit, or just unidirectional data transmission, and case4 two-wayly has data to transmit; Secondly, three case only have one to receive and dispatch bout above, namely send a command to safety chip by mobile interchange equipment, return state code after safety chip process completes, a case just completes, and case4 has the order of multi-round and data to send and return data and status code.Such benefit is, for large batch of data encrypting and deciphering process, the efficiency of case4 will far above the case of three above.
The present invention also discloses a kind of quiescent dissipation control method of the financial key based on audio frequency and USB data transmission, and the method comprises:
When audio frequency secret key is connected to external audio frequency apparatus (mobile interchange equipment), the triode Q1 conducting in power control unit, now battery 3 is to system power supply.
When audio frequency secret key, need not connect audio frequency apparatus (mobile interchange equipment), connect R channel one end of audio interface 5 for open circuit, triode Q1 ends, and system is not powered.
Effectively can be reduced the quiescent dissipation of system by this circuit, extend the service time of battery.
The present invention also discloses a kind of dynamic power consumption control method of the financial key based on audio frequency and USB data transmission, and the method comprises:
In secret key work, for different application, first the module clock do not used in application is closed by safety chip 1.
And after each command process completes, safety chip 1 enters sleep pattern, and when there being external command, safety chip 1 wakes up by level change on bus extender again, safety chip 1 starts to receive and processes next external command, and after external command completes, safety chip 1 enters sleep pattern again.
Although content of the present invention has done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple amendment of the present invention and substitute will be all apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (9)
1., based on a financial key for audio frequency and USB data transmission, it is characterized in that, this secret key comprises:
Audio interface (5), it connects external audio frequency apparatus, receives or output audio signal;
USB interface (6), it connects external equipment, for the power supply of secret key and Signal transmissions;
Sound signal change-over circuit (2), its connect described in audio interface (5), rear output is processed to sound signal;
Safety chip (1), it connects described audio interface (5) received audio signal by described sound signal change-over circuit (2); And be connected to external equipment by USB interface (6);
Battery (3), it is for storage of electrical energy, and powers to secret key;
Battery management chip (4), it connects described battery (3), carries out charge and discharge control to battery (3);
Power control unit, battery management chip (4), audio interface (5), safety chip (1) described in its difference circuit connects;
When audio interface (5) is not connected external equipment with USB interface (6), the Circuits System of secret key is not powered, powered-down;
When only having USB interface (6) to connect external equipment, powered by USB interface (6) Circuits System to secret key, battery management chip (4) controls to charge to battery (3) simultaneously;
When only having audio interface (5) to connect external audio frequency apparatus, power control unit controls battery (3) by battery management chip (4) and powers to the Circuits System of secret key;
Wherein, described sound signal change-over circuit (2) comprises audio input circuit and audio output circuit;
Described audio input circuit comprises the second electric capacity (C2), and the two ends of the second electric capacity (C2) are connected to the L channel of safety chip input end (A_In) and audio interface respectively; Between second electric capacity (C2) and safety chip input end, circuit is connected with the 3rd resistance (R3) and the 4th resistance (R4); 3rd resistance (R3) ground connection, the 4th resistance (R4) connects power supply (VDD);
Described audio output circuit comprises the second resistance (R2) and the first electric capacity (C1) that are connected in series; Second resistance (R2) connects safety chip output terminal (A_Out), and the first electric capacity (C1) connects the microphone end of audio interface; Between second resistance (R2) and the first electric capacity (C1), circuit is connected with the first resistance (R1), this first resistance (R1) ground connection.
2., as claimed in claim 1 based on the financial key of audio frequency and USB data transmission, it is characterized in that, described power control unit also circuit is connected with linear voltage regulator, and is powered by the Circuits System of this linear voltage regulator to secret key.
3., as claimed in claim 1 based on the financial key of audio frequency and USB data transmission, it is characterized in that, described sound signal change-over circuit (2) is connected by bus extender circuit with between safety chip (1).
4. the financial key based on audio frequency and USB data transmission as described in claim 1 or 3, is characterized in that, described sound signal change-over circuit (2) adopts resistance-capacitance network.
5., as claimed in claim 1 based on the financial key of audio frequency and USB data transmission, it is characterized in that, described power control unit comprises: the second inductance (L2) be connected in series, the 5th resistance (R12) and triode (Q1); Second inductance (L2) connects the R channel of audio interface, the base stage of the 5th resistance (R12) connecting triode (Q1), and the emitter of triode (Q1) connects battery management chip (4), and collector connects the circuit system of secret key; Between 5th resistance (R12) and the emitter of triode (Q1), circuit is connected with the 6th resistance (R13).
6., as claimed in claim 1 based on the financial key of audio frequency and USB data transmission, it is characterized in that, the external equipment that described USB interface (6) connects comprises: computing machine, panel computer or mobile phone.
7. as claimed in claim 1 based on the financial key of audio frequency and USB data transmission, it is characterized in that, described secret key intercommunication and adopt Manchester's cde mode with the signal data of PERCOM peripheral communication.
8., as claimed in claim 1 based on a quiescent dissipation control method for the financial key of audio frequency and USB data transmission, it is characterized in that,
Described financial key is provided with the power control unit comprising following circuit structure: the second inductance (L2) be connected in series, the 5th resistance (R12) and triode (Q1); Second inductance (L2) connects the R channel of audio interface, the base stage of the 5th resistance (R12) connecting triode (Q1), and the emitter of triode (Q1) connects battery management chip (4), and collector connects the circuit system of secret key; Between 5th resistance (R12) and the emitter of triode (Q1), circuit is connected with the 6th resistance (R13);
The method comprises: when audio frequency secret key is connected to external audio frequency apparatus, triode (Q1) conducting in power control unit, and now battery (3) is to system power supply;
When audio frequency secret key, need not connect audio frequency apparatus, connect R channel one end of audio interface for open circuit, triode (Q1) ends, and system is not powered.
9. as claimed in claim 1 based on a dynamic power consumption control method for the financial key of audio frequency and USB data transmission, it is characterized in that, the method comprises: in work, and the module clock that first safety chip (1) will not used in application is closed;
And after each command process completes, safety chip (1) enters sleep pattern, when there being external command, level on bus extender between sound signal change-over circuit (2) and safety chip (1) changes and is again waken up by safety chip (1), safety chip (1) starts to receive and processes next external command, and after external command completes, safety chip (1) enters sleep pattern again.
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| CN103926867A (en) * | 2014-05-04 | 2014-07-16 | 张金奎 | Information transmission method based on audio signals |
| CN105700983B (en) * | 2014-11-26 | 2019-06-18 | 北京握奇智能科技有限公司 | A kind of judgment method of USBKey and USBKey operating mode |
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Address after: 200233 Room 704, Building 2, No. 2570 Hechuan Road, Minhang District, Shanghai Patentee after: Shanghai Hangxin Electronic Technology Co.,Ltd. Address before: 200241, building 6, building 555, No. 8, Dongchuan Road, Shanghai, Minhang District Patentee before: SHANGHAI AISINOCHIP ELECTRONIC TECHNOLOGY Co.,Ltd. |