CN106774843A - A kind of cipher input equipment and method - Google Patents
A kind of cipher input equipment and method Download PDFInfo
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- CN106774843A CN106774843A CN201611046529.2A CN201611046529A CN106774843A CN 106774843 A CN106774843 A CN 106774843A CN 201611046529 A CN201611046529 A CN 201611046529A CN 106774843 A CN106774843 A CN 106774843A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/011—Arrangements for interaction with the human body, e.g. for user immersion in virtual reality
- G06F3/015—Input arrangements based on nervous system activity detection, e.g. brain waves [EEG] detection, electromyograms [EMG] detection, electrodermal response detection
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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
- G06F21/82—Protecting input, output or interconnection devices
- G06F21/83—Protecting input, output or interconnection devices input devices, e.g. keyboards, mice or controllers thereof
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Abstract
The present invention provides a kind of cipher input equipment and method, including：The electrical brain stimulation device of the visual stimulus of multiple difference fixed frequencies is provided；The eeg signal acquisition device of the EEG signals of user is gathered by lead, wherein, EEG signals are user's foundation password and Password Policy, and selection one is watched attentively and produced from the visual stimulus of multiple difference fixed frequencies；The input unit being connected with eeg signal acquisition device, extracts Steady State Visual Evoked Potential feature from EEG signals, converts thereof into password according to Password Policy, and be transferred to encryption device.Also, Password Policy includes the relation between the visual stimulus of password fixed frequency different from multiple.The encryption input mode of the new bio feature proposed the present invention be directed to traditional Password Input pattern, it eliminates actual Password Input operation using SSVP as cryptographic means.Invention increases the security of Password Input, without training, recognition correct rate is higher, it is wide to be applicable crowd's scope.
Description
Technical field
The present invention relates to a kind of password input system, it is more particularly to a kind of without actual Password Input operate based on steady
The cipher input equipment and method of state VEP.
Background technology
With the development of internet and information technology, people frequently can be operated using authentication in daily life.Most
Conventional identification authentication mode is that cipher instruction is manually entered, and in addition also has iris and fingerprint etc. to utilize biological information feature
Identity authorization system, the corollary apparatus of costliness are needed based on existing biological information feature verification mode, thus actually make
It is difficult to be widely applied in.These traditional identity identifying methods have actual Password Input just to do due to it, because
This people carry out Password Input operate when, by means such as common video monitoring, thermoinductions, so that it may directly steal, clone
Or password, courseware are usurped, the input operation of password is to be very easy to trigger password to be stolen.If not using these modes, only
Only rely on the activity of brain, the i.e. mode of " idea " and Password Input is translated into by relevant device, then can evade and steal, replicate
Etc. safety hazard behavior." trying to figure out in the abyss of the mind, be most difficult to grasp is the popular feeling ", by this kind of mode, only instruction input person's sheet
People knows the cipher, it is impossible to know complete authentication information by other approach.And brain-computer interface engineering is then to complete this
The core technology of significant innovation.
Brain-computer interface (Brain Computer Interface, BCI) is a kind of new man-machine interaction mode, and it passes through
Machine learning carries out feature extraction and identification with algorithm for pattern recognition to the cerebral nerve active signal under all kinds of thinking tasks, and
Translate into control instruction and directly control external equipment.The technology establish human brain and an external equipment without limbs auxiliary it
Between communication path.Steady State Visual Evoked Potential (Steady-state visual evoked potential, SSVEP) is brain
One of thinking task that machine interfacing is used.The steady-state induced current potential SSVEP of view-based access control model is flashed by extraneous fixed frequency
Visual stimulus induce and produce, its task is needed with the frequency of attention cognitive resources corresponding EEG signals as carrier reaches of user
Spectrum dominant advantage.This thinking activities for selecting fixation object stimulation are one of schemes for commonly using in BCI, because it typically need not
Training just can reach rate of information transmission higher, thus be widely used in the intelligent uses such as brain control dialing, prosthesis control
Aspect.But, not yet there is a kind of system that Password Input is realized using brain-computer interface at present.Therefore, how by brain-computer interface
It is those skilled in the art institute problem demanding prompt solution to be applied in password input system.
The content of the invention
The shortcoming of prior art in view of the above, it is an object of the invention to provide a kind of cipher input equipment and side
Method, during for solving to be input into password using actual Password Input operation in the prior art, the easily stolen problem of password.
In order to achieve the above objects and other related objects, the present invention provides a kind of cipher input equipment, including：Electrical brain stimulation
Device, there is provided the visual stimulus of multiple difference fixed frequencies；Eeg signal acquisition device, the brain telecommunications of user is gathered by lead
Number；Wherein, the EEG signals are users according to password and Password Policy, the choosing from the visual stimulus of multiple difference fixed frequencies
One is selected to watch attentively and produce；Input unit, is connected with the eeg signal acquisition device, for from the eeg signal acquisition
Steady State Visual Evoked Potential feature is extracted in the EEG signals of device collection, the stable state vision is lured according to Password Policy
Generating position Feature Conversion is transferred to encryption device into the password.
In one embodiment of the invention, the Password Policy includes the vision of password fixed frequency different from multiple
Relation between stimulation.
In one embodiment of the invention, the cipher input equipment also includes control device, the control device difference
It is connected with the electrical brain stimulation device, the eeg signal acquisition device and input unit；It is described for adjusting and controlling
Electrical brain stimulation device, the eeg signal acquisition device and the input unit.
In one embodiment of the invention, the eeg signal acquisition device includes：Brain electricity for being worn over user's head
Cap；Electrode for gathering the EEG signals, it is arranged on brain electricity cap；Amplifier for amplifying the EEG signals,
It is connected with the electrode.
In one embodiment of the invention, the electrical brain stimulation device uses the stimulation panel being made up of multiple photophores；
And multiple photophores are flashed with different fixed frequencies respectively.
In one embodiment of the invention, led to by bluetooth module between the stimulation panel and the control device
Letter.
In one embodiment of the invention, the input unit includes：Receiver module, with the eeg signal acquisition device
It is connected, the EEG signals for receiving the eeg signal acquisition device collection；Data acquisition module, with the reception mould
Block is connected, and for the EEG signals received according to the asynchronous interception of time slip-window, obtains the eeg data in the unit interval；
Pretreatment module, for being filtered pretreatment to the eeg data for obtaining；Analysis module, after to filter preprocessing
The eeg data carry out the Sequence Detection based on Canonical Correlation Analysis and process, extract and obtain stable state vision inducting electricity
Position feature；Password modular converter, for the Steady State Visual Evoked Potential feature extracted to be changed according to the preset strategy
Into the password；Communication module, for the password transmission for obtaining to the encryption device will to be changed.
In one embodiment of the invention, the control module sets fixed frequency, the institute of multiple light emitter flashes
State time slip-window and the Password Policy.
The invention also discloses a kind of cipher-code input method, cipher input, and the cipher input are applied to
It is connected with eeg signal acquisition device；The cipher-code input method includes：Reception comes from the eeg signal acquisition device
EEG signals；Wherein, the EEG signals are user's foundation password and Password Policy, and the multiple from electrical brain stimulation device is different
One is selected in the visual stimulus of fixed frequency to watch attentively and produce；According to the brain electricity that the asynchronous interception of time slip-window is received
Signal, obtains the eeg data in the unit interval；The eeg data to obtaining is filtered pretreatment；To filter preprocessing
The eeg data afterwards carries out the Sequence Detection based on Canonical Correlation Analysis and processes, and extracts and obtains the stable state vision inducting
Current potential feature；The Steady State Visual Evoked Potential feature extracted is converted into the password according to the Password Policy；Transmission
The password for obtaining is changed to encryption device；Wherein, the Password Policy includes password fixed frequency different from multiple
Visual stimulus between relation.
It is the fixed frequency of multiple visual stimulus of the electrical brain stimulation device, described close in one embodiment of the invention
The tactful and described time slip-window of code is to set to generate beforehand through control module.
As described above, a kind of cipher input equipment of the invention and method, micro- by the brain for gathering human brain thinking activity
Current signal is used as password transport vehicle so that password is completed by the manipulation that Password Input person need not carry out to external device (ED) defeated
Enter function, thus the password such as common video monitoring, thermoinduction is directly stolen means and cannot also be used, and substantially increases password defeated
The security for entering；Also, Steady State Visual Evoked Potential has non-stationary property, which greatly enhances the difficulty that password is intercepted and captured in midway
Degree, even and if intercepted and captured password, cannot also be cracked in the case of the input mechanism that cannot know the cipher, further increase close
The security of code input；Additionally, cipher input equipment of the invention and method without training, recognition correct rate is higher, be applicable people
Group's scope is wide, is suitable for cipher instruction and is input into the strict regular job behavior of this precision requirement.
Brief description of the drawings
Fig. 1 is shown as a kind of theory structure schematic diagram of cipher input equipment disclosed in the embodiment of the present invention.
Fig. 2 is shown as a kind of structural representation of cipher input equipment disclosed in the embodiment of the present invention.
Fig. 3 is shown as a kind of theory structure of password input system midbrain electrical stimulation device disclosed in the embodiment of the present invention and shows
It is intended to.
Fig. 4 is shown as a kind of microcontroller of password input system midbrain electrical stimulation device disclosed in the embodiment of the present invention
The state transition diagram of reception state.
Fig. 5 is shown as a kind of schematic flow sheet of cipher-code input method disclosed in the embodiment of the present invention.
Fig. 6 is shown as in a kind of cipher-code input method disclosed in the embodiment of the present invention, to electrical brain stimulation device and brain telecommunications
The relevant parameter of number processing unit and the schematic diagram at the setting interface of Password Policy.
Fig. 7 is shown as a kind of schematic flow sheet of cipher-code input method disclosed in another embodiment of the present invention.
Component label instructions
110 electrical brain stimulation devices
111 LED stimulate panel
112 microcontrollers
113 bluetooth modules
120 eeg signal acquisition devices
130 input units
131 receiver modules
132 data acquisition modules
133 pretreatment modules
134 analysis modules
135 password modular converters
136 communication modules
140 control devices
S51~S56 steps
Specific embodiment
Embodiments of the present invention are illustrated below by way of specific instantiation, those skilled in the art can be by this specification
Disclosed content understands other advantages of the invention and effect easily.The present invention can also be by specific realities different in addition
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints with application, without departing from
Various modifications or alterations are carried out under spirit of the invention.It should be noted that, in the case where not conflicting, following examples and implementation
Feature in example can be mutually combined.
Refer to accompanying drawing.It should be noted that the diagram provided in following examples only illustrates this hair in a schematic way
Bright basic conception, component count when only display is with relevant component in the present invention rather than according to actual implementation in schema then,
Shape and size are drawn, and it is actual when the implementing kenel of each component, quantity and ratio can be a kind of random change, and its component
Layout kenel is likely to increasingly complex.
A kind of cipher input equipment of the invention and method are directed to the new bio that traditional Password Input pattern is proposed
The encryption input mode of feature, it is eliminated actual close using bio signal (Steady State Visual Evoked Potential) as cryptographic means
Code input operation.Using Steady State Visual Evoked Potential as input password brain electrical feature pattern so that the present invention can quickly, standard
True completion Password Input.
Embodiment 1
As depicted in figs. 1 and 2, it is based on Steady State Visual Evoked Potential (Steady-state present embodiment discloses one kind
Visual evoked potential, SSVEP) cipher input equipment, including：Electrical brain stimulation device 110, EEG signals is adopted
Acquisition means 120, input unit 130 and control device 140.Wherein,
Electrical brain stimulation device 110 is used to provide the user the visual stimulus of multiple difference fixed frequencies.Also, electrical brain stimulation
Device 110 is to realize the visual stimulus to user, i.e. electrical brain stimulation device 110 by many by the light of different frequency flicker
Individual photophore is flashed with respective fixed frequency respectively, so as to reach the visual stimulus to user.In the present embodiment, brain electricity thorn
Swash module 110 stimulates panel 111 using the LED being made up of 4 LEDs, and each LED is dodged with respective fixed frequency respectively
It is bright.Specifically, as shown in Figures 2 and 3, LED stimulates 4 LEDs of panel 111 and the GPIO (General of microcontroller 112
Purpose Input Output, general input/output port) interface is connected, the string of bluetooth module 113 and microcontroller 112
Mouthful it is connected, and bluetooth module 113 is configured as Bluetooth slave devices so that microcontroller 112 can be by bluetooth module 113 and upper
Position machine (i.e. control device 150) is communicated, and the control panel further up to LED can be with host computer (i.e. control module
150) purpose of radio communication is carried out.In this way, controlling each LED respectively by the GPIO port interface of microcontroller 112
Light on and off；The fixed frequency that LED is used is to divide realization by a public timer interruption.
Bluetooth module 113 is configured by AT (Attention) instruction set.Wherein, AT command set is set from terminal
Standby (Terminal Equipment, TE) or data terminal equipment (Data Terminal Equipment, DTE) are suitable to terminal
Orchestration (Terminal Adapter, TA) or data circuit termination equipment (Data Circuit Terminal Equipment,
DCE) send.The control of the aspects such as user can be called by AT instructions, short message, phone directory, data service, fax.
Bluetooth module 113 is configured by hyper terminal with AT command set：First, configuration bluetooth module 113 is Bluetooth slave devices, with
Just connected with PC host computers；Secondly, the serial ports form of bluetooth module 113, i.e. baud rate 115200, eight bit data position, one are configured
Position stop position, no parity check position；Then, the classification for setting bluetooth module 113 is " bluetooth earphone ", in case can in some PC equipment
Can nonrecognition is unknown or bluetooth equipment of particular category, lead to not identification pairing bluetooth submodule 1130；Finally, bluetooth is configured
The device pairing code of module 113, is " 1234 ".
Further, the serial communication protocol of microcontroller 112 is configured：16 system numbers in nth byte are used as n-th
The flicker frequency of LED111, packet with " r n " ending.One data can be realized by such packet encapsulation mode
Bag sets the frequency of multiple lamps simultaneously, in addition, in order to prevent maloperation, the frequency of additional each LED of agreement is necessary for being incremented by pass
System.As can be seen here, data packet length is the number N plus packet bag tail 2 for needing to control lamp, so each data packet length is N+
2 (N is up to 16).Serial data bag form is as shown in table 1：
The serial data bag form of table 1
| byte 1 | byte 2 | byte 3 | byte 4 | … | byte N+1 | byte N+2 |
| LED1 freq | LED2 freq | LED3 freq | LED4 freq | … | 0x0D | 0x0A |
Host computer and microcontroller 112 are that communication is completed by bluetooth, and microcontroller 112 is gathered by serial ports interruption
Serial data.The parsing of communication data packet realizes that one is divided into three states by a state machine：Data acquisition state；
Receive ' 0X0D ' state；Finish receiving waiting processing state.USART_RX_STA becomes as the mark of serial data reception state
Amount, two high as user equipment flag bit, low six used as order caching byte counter.First, microcontroller 112
During in " data acquisition state ", serial data is gathered, microcontroller 112 sends serial ports reception interruption directly after receiving serial data
Stream, the value in serial ports cache register is taken out；If this data is not ' 0X0D ', byte REG adds one, and by this
Data write data buffer storage；When data are ' 0X0D ', ' 0X0D ' is stored in data buffer storage, state transition is " to receive ' 0X0D '
State ".After continuing to receive ' 0X0A ', judge to finish receiving, state machine is transferred to " finishing receiving waiting processing state ".Wait master
Data are processed in program, the state transition graph of reception state is as shown in figure 4, the definition such as institute of table 2 of USART_RX_STA
Show：
The USART_RX_STA definition of table 2
Further, since the flicker of LED is by carrying out frequency dividing realization to a timer.In order to reach frequency higher
Rate accuracy rate, the temporal resolution of the timer must be sufficiently small, makes LED flicker frequency have frequency higher accurate to reach
True property.The interruption frequency f of timer is set, and LED exports flicker frequency by the divide ratio of the interruption frequency for setting come real
It is existing.In the present embodiment, divided as interruption frequency using 20KHz.The output control of LED by after frequency dividing to IO
(Input/Output) upset is realized.The dutycycle for setting LED is 50%, therefore the toggle frequency of LED output should
It is the twice of LED flicker frequency.Divide ratio can be calculated by following formula and obtained：Wherein, n represents divide ratio,
F is interruption frequency, fLEDIt is the flicker frequency of the LED that PC host computers send.By bluetooth submodule 113, microcontroller 112
Reception comes from the packet of host computer, and then the computing formula according to above-mentioned divide ratio n is calculated the frequency dividing system of LED
Number.Specifically, the frequency values f that will be receivedLEDThe conversion of data value is carried out according to above formula, control flicker frequency is loaded into afterwards
Divide ratio register in.In timer interruption each time, all add one to the corresponding frequency counter of each LED, when
When the corresponding frequency counter count value of each LED is more than or equal to corresponding divide ratio n in interruption, corresponding LED pipe
Pin level overturns, corresponding LED frequency counter clear 0.
The IO of microcontroller 112 is configured to recommending output mode pattern, and the IO of microcontroller 112 connects current-limiting resistance series LED lamp
Ground connection.When the IO of microcontroller 112 exports high level, correspondence LED is lighted；When the IO of microcontroller 112 exports low level
When, correspondence LED is extinguished.That is, LED is directly driven by microcontroller 112, it is right when IO is output as high level
LED is answered to light, when IO is output as low level, correspondence LED is extinguished.The electric current of LED is with the output of microcontroller 112 most
High current is relevant.The maximum current that LED is obtained can not possibly be more than the output maximum current that the IO of microcontroller 112 is allowed.
In the present embodiment, the output maximum current of microcontroller 112 is 8mA, and LED can obtain bright well in the case of 5mA
The effect of degree.Can meet realized by LED completely using this scheme of the present embodiment and visual stimulus is carried out to user
Demand.In addition in terms of cost, the present embodiment is in addition to necessary holding wire corresponding with LED quantity, it is only necessary to one
Ground wire GND, is that line is minimum in all schemes.
Eeg signal acquisition device 120 is the EEG signals for gathering user.Wherein, EEG signals are users according to close
Code and Password Policy, selection one is watched attentively and is produced from the visual stimulus of multiple difference fixed frequencies.In the present embodiment,
Eeg signal acquisition device 120 be by Austrian g.Tec companies provide eeg signal acquisition instrument, including wearable brain electricity
Portable brain electric signal amplifier is led in polar cap, Cu electrodes and 16.The eeg signal acquisition device 120 sets to amplifier filtering
Fixed and Real-time Collection human brain micro-current signal, and be finally transferred in EEG Processing module 130 after signal is amplified.Its
In, there are some relevant parameters to need to set in eeg signal acquisition device 120, the parameter that these need to be set includes but does not limit
In：Sample rate, frequency filtering scope, lead distribution configuration etc..Convenience in view of practical application and with visual stimulus phase
The lead distribution character of pass, chooses " POz ", " O1 ", " Oz ", " O2 " four leads respectively.
Input unit 130, is connected with eeg signal acquisition device 120, for what is gathered from eeg signal acquisition device 120
Steady State Visual Evoked Potential feature is extracted in EEG signals, according to Password Policy by the Steady State Visual Evoked Potential Feature Conversion
Into the password, and it is transferred to encryption device.Specifically, input unit 130 includes：
Receiver module 131, is connected with eeg signal acquisition device 120, is adopted for receiving eeg signal acquisition device 120
The EEG signals of collection；
Data acquisition module 132, for the EEG signals received according to the asynchronous interception of time slip-window, obtains the unit interval
Interior eeg data.Set according to user, certain hour length is intercepted from the EEG signals for receiving, it is asynchronous by time slip-window
Interception, obtains the eeg data in the unit interval.Also, asynchronous interception is ongoing, until a valid password is defeated
Enter (code characters are input into or delete) to complete.Then, recycling is operated as above, until Password Input character number and target number
Matching, then input is completed.
Pretreatment module 133, for being filtered pretreatment to the eeg data for obtaining.Due to Mental imagery and SSVEP
Two kinds of brain power modes are mainly reflected on the rhythm and pace of moving things energy of 5Hz to 30Hz, therefore, the band logical set of frequency of filtering is 5-30Hz.
Analysis module 134, for carrying out the eeg data after filter preprocessing based on Canonical Correlation Analysis
The Sequence Detection treatment of (Canonical Correlation Analysis, CCA), recognizes Steady State Visual Evoked Potential feature.
Wherein, Canonical Correlation Analysis are a kind of a kind of methods for studying the correlation between multi-C vector.It is by two groups of time serieses
Signal is projected on new Spatial Dimension, enables to obtain the coefficient correlation of maximum, and this coefficient is canonical correlation coefficient.
It is single step CCA testing results by being calculated the canonical correlation coefficient of each frequency.In use, the physiology of user
State may receive external disturbance, so the decision method of single can not reach good recognition effect, thus introduce signal sequence
The algorithm of row detection (sequence detection), carries out Classification and Identification.Sequence Detection algorithms are not specifying judgement time in advance
In the case of number, to the Continuous Observation of canonical correlation analysis：Each frequency correlation coefficient that single is observed removes all coefficients
It is worth to sequence observation；The sequence observation of each frequency is gradually connected again is multiplied, the maximal sequence until reaching threshold requirement
Observed result occurs stopping observation；The frequency of correspondence maximal sequence detected value is result of determination.Can be by the method
On the premise of ensuring judgement accuracy rate, average time decision is reduced as far as possible, be finally reached the mesh for improving EEG's Recognition performance
's.
Password modular converter 135, it is close for the Steady State Visual Evoked Potential feature of extraction to be converted into according to Password Policy
Code, so as to realize the input operation of password.
Communication module 136, for the password transmission for obtaining to encryption device will to be changed.In the present embodiment, it is input into
Device 130 can both realize wired transmission of password with encryption device by wired connection, it is also possible to by wireless connection,
To realize the wireless transmission of password.
Control device 140 respectively with electrical brain stimulation device 110, eeg signal acquisition device 120 and the phase of input unit 130
Even, for being adjusted control to electrical brain stimulation device 110, eeg signal acquisition device 120 and input unit 130, and set
Password Policy.Specifically, control device 140 can be realized to electrical brain stimulation device 110, eeg signal acquisition device 120 and defeated
Enter the setting of the relevant parameter in device 130, the setting, time slip-window including but not limited to data interception time length
Setting, the setting of sequence detection threshold, the setting for inducing frequency of stimulation and stimulation correspondence illustrate the setting at interface etc..
Also, the Password Policy that control device 140 is set includes but is not limited to password and is regarded with the different fixed frequencies of multiple
Feel the relation between stimulating.For example：In eeg signal acquisition, electrical brain stimulation device 110 uses 10 LEDs, respectively
10 different digital 0-9 of correspondence, and 10 LEDs are respectively adopted respective fixed frequency flicker, as user provides
0-9 different visual stimulus；And the password " 51 " that user remembers according to it：No. 5 LED corresponding with " 5 " is watched attentively according to prompting
Lamp, what is now gathered is to watch No. 5 EEG signals of LED attentively；And No. 1 LED corresponding with " 1 " is watched attentively according to prompting, this
When gather is to watch No. 1 EEG signals of LED attentively；And input unit 130 is carrying out Steady State Visual Evoked Potential Feature Conversion
During into password, by from watching the Steady State Visual Evoked Potential Feature Conversion extracted in No. 5 EEG signals of LED attentively for password 5, and
It is input into；By from watching the Steady State Visual Evoked Potential Feature Conversion extracted in No. 1 EEG signals of LED attentively for password 1, and
It is input into.
Further, the auxiliary equipment as encryption device that the cipher input equipment of the present embodiment can be independent is entered to exercise
With.And in order to easily facilitate the use of cooperation encryption device, can be by the input unit 130 of the cipher input equipment of the present embodiment
And/or control device 140 is made of one with encryption device, by electrical brain stimulation device 110 and eeg signal acquisition device 120 with plus
Close equipment is connected, in this way, can be carried out to electrical brain stimulation device 110 and eeg signal acquisition device 120 by encryption device
Corresponding adjustment and control, for example, the opening and closing of device, set relevant parameter (fixed frequency of LED flickers, sample rate,
Frequency filtering scope, lead distribution configuration) etc..So, encryption device can directly to being connect from eeg signal acquisition device 120
EEG signals are received, is correspondingly processed, finally realize the conversion of password.Adopt in this way, can be complete in encryption device
Being set and controlled for the relevant parameter of each device in the cipher input equipment of paired the present embodiment, can also directly to the brain of collection
Electric signal is processed, and to obtain corresponding password, it is more convenient to use.
Additionally, in order to protrude innovative part of the invention, will not be proposed by the invention with solution in the present embodiment
The less close module of technical problem relation is introduced, but this is not intended that in the present embodiment do not exist other modules.
Embodiment 2
Steady State Visual Evoked Potential (Steady-state visual evoked are based on present embodiment discloses one kind
Potential, SSVEP) cipher-code input method, it is applied in the cipher input of cipher input equipment, also, password
Input unit is also connected with eeg signal acquisition device.
, it is necessary to carry out a series of operation before Password Input is carried out：
First, to carry out the setting of the relevant parameter of cipher input equipment：
First, signal filtering frequency range, sample rate, lead of eeg signal acquisition device etc. are configured.In this implementation
In example, the bandpass filtering of filtering selection 5-30Hz, sample rate is set to 256Hz, and Conduction choice is POz, O1, Oz, O2；
Secondly, the relevant parameter to electrical brain stimulation device and EEG Processing device is configured.Relevant parameter includes
But it is not limited to data processing time window, time sliding window, Sequence Detection decision threshold and LED flicker frequencies etc..This reality
Apply in example, the concrete numerical value of parameter refers to table 3；
The parameter setting explanation of table 3
Finally, Password Policy is configured：The present embodiment is same as Example 1, and electrical brain stimulation device is used by 4
The LED of individual LED composition stimulates panel, therefore, Password Policy is divided into two levels.
To the setting interface such as figure of the relevant parameter and Password Policy of electrical brain stimulation device and EEG Processing device
Shown in 6.4 LEDs correspond to 4 visual stimulus of different fixed frequencies respectively：A, B, C and D.Visual stimulus is close with two levels
The relation of code is as shown in table 4-7.
Table 4 stimulates the implication with the first level password
| Visual stimulus | Implication |
| A | Character field 1,2,3,4 |
| B | Character field 6,7,8 |
| C | Character field 8,9,0 |
| D | Delete deletion actions |
The ground floor of table 5 stimulates the corresponding second level password implications of A
| Visual stimulus | Implication |
| A | Numeral 1 |
| B | Numeral 2 |
| C | Numeral 3 |
| D | Numeral 4 |
The ground floor of table 6 stimulates the corresponding second level password implications of B
| Visual stimulus | Implication |
| A | Numeral 5 |
| B | Numeral 6 |
| C | Numeral 7 |
| D | Null |
The ground floor of table 7 stimulates the corresponding second level password implications of C
| Visual stimulus | Implication |
| A | Numeral 8 |
| B | Numeral 9 |
| C | Numeral 0 |
| D | Null |
After above-mentioned parameter is provided with, start keys are pressed, you can to start Password Input：；4 LEDs are respectively with each
From fixed frequency enter line flicker, provided the user 4 visual stimulus of different fixed frequencies；Eeg signal acquisition device is opened
Begin collection EEG signals.
As shown in figure 5, the cipher-code input method of the present embodiment includes：
Step S51, reception comes from the EEG signals of eeg signal acquisition device, wherein, the EEG signals are users
According to password and Password Policy, from the visual stimulus of the multiple difference fixed frequencies of electrical brain stimulation device selection one watch attentively and
Produce.
After start keys are pressed, the first level can be jumped into.User carries out character field according to the affiliated character field of character of password
Selection.For example, password is " 481329 ".Digital " 4 " should be input into first, and in the first level of Password Policy, digital " 4 " are right
What is answered is the LED in the upper left corner, i.e. visual stimulus A.So, user needs to watch the LED positioned at the upper left corner attentively, now, collection
The EEG signals of user.
Step S52, according to the EEG signals of the asynchronous interception collection of time slip-window, obtains the brain electricity number in the unit interval
According to；
Step S53, then eeg data is carried out the filter preprocessing of 5Hz~30Hz；
Step S54, to filter preprocessing after the eeg data carry out the Sequence Detection based on Canonical Correlation Analysis
Treatment, extracts and obtains the Steady State Visual Evoked Potential feature；
Wherein, the concrete processing procedure of step S52~step S54 is same as Example 1, just repeats no more herein.
Step S55, the Steady State Visual Evoked Potential feature extracted is converted into according to the preset strategy described close
Code；
According to the first level of Password Policy, password modular converter can complete input judgement, i.e. password may for 1,2,
3、4；Into the second level, and playing alert tones；After user hears prompt tone, can be obtained from the second level of Password Policy
Know, it is the LED in the lower right corner, i.e. visual stimulus D that digital " 4 " corresponding.So, user needs to watch the LED positioned at the lower right corner attentively
Lamp, now, repeat step S51-S55, and in step S55, according to the second level of Password Policy, first password can be sentenced
Break to be " 4 ", realize first conversion of password.After the input of first password of completion, can playing alert tones, expression one
Position password is converted, and enters the first level..
Step S56, the password that transmitting and converting is obtained to encryption device：
First password for obtaining will be changed encryption device is transferred to by communication module, then return to step S51,
Carry out the acquisition and transmission input of second password.
The input process of each password is identical with the input process of first password, and close described in Fig. 6
Under code strategy, the input control flow of password is as shown in fig. 7, will not be repeated here.
When the input unit and control device of encryption device and cipher input equipment set and be integrated, when character input number
When amount is identical with code characters quantity, the collection of EEG signals is automatically stopped, carries out Password Input correctness judge.
When encryption device and cipher input equipment are each independent, when character input quantity and code characters quantity
When identical, encryption device will no longer receive the data transmitted by input unit, and password to having received carries out correctness
Judge.
Additionally, in the input process of password, during if there is character input mistake, also using deletion function to mistake
Character deletion.For example, when user has found the 4th code error of input, " Delete " operation can be carried out in ground floor level
Delete an input character：I.e. user watches the LED positioned at the lower right corner attentively, completes to delete the password of input error.
After deletion, will stay on the first level and wait next step operation.
Above the step of various methods divide, be intended merely to description it is clear, can be merged into when realizing a step or
Some steps are split, multiple steps are decomposed into, as long as comprising identical logical relation, all in the protection domain of this patent
It is interior；To adding inessential modification in algorithm or in flow or introducing inessential design, but its algorithm is not changed
With the core design of flow all in the protection domain of the patent.
It is seen that, the present embodiment is embodiment of the method corresponding to those in the first embodiment, and the present embodiment can be real with first
Example is applied to work in coordination implementation.The relevant technical details mentioned in first embodiment are still effective in the present embodiment, in order to reduce
Repeat, repeat no more here.Correspondingly, the relevant technical details mentioned in the present embodiment are also applicable in first embodiment.
In sum, a kind of cipher-code input method of the invention, system and device, by gathering the big of human brain thinking activity
Brain micro-current signal is used as password transport vehicle so that complete close by the manipulation that Password Input person need not carry out to external device (ED)
Code input function, thus the password such as common video monitoring, thermoinduction directly steals means and cannot also use, and substantially increases close
The security of code input；Also, Steady State Visual Evoked Potential has non-stationary property, password is intercepted and captured which greatly enhances midway
Difficulty, even and if intercepted and captured password, cannot also be cracked in the case of the input mechanism that cannot know the cipher, further increase
The security of Password Input；Additionally, cipher-code input method of the invention, system and device need not be trained, recognition correct rate is higher,
The crowd of being applicable scope is wide, is suitable for cipher instruction and is input into the strict regular job behavior of this precision requirement.So, the present invention
Effectively overcome various shortcoming of the prior art and have high industrial utilization.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.It is any ripe
The personage for knowing this technology all can carry out modifications and changes under without prejudice to spirit and scope of the invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete with institute under technological thought without departing from disclosed spirit such as
Into all equivalent modifications or change, should be covered by claim of the invention.
In sum, a kind of cipher input equipment of the invention and method, micro- by the brain for gathering human brain thinking activity
Current signal is used as password transport vehicle so that password is completed by the manipulation that Password Input person need not carry out to external device (ED) defeated
Enter function, thus the password such as common video monitoring, thermoinduction is directly stolen means and cannot also be used, and substantially increases password defeated
The security for entering；Also, Steady State Visual Evoked Potential has non-stationary property, which greatly enhances the difficulty that password is intercepted and captured in midway
Degree, even and if intercepted and captured password, cannot also be cracked in the case of the input mechanism that cannot know the cipher, further increase close
The security of code input；Additionally, cipher input equipment of the invention and method without training, recognition correct rate is higher, be applicable people
Group's scope is wide, is suitable for cipher instruction and is input into the strict regular job behavior of this precision requirement.So, effective gram of the present invention
Take various shortcoming of the prior art and have high industrial utilization.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.It is any ripe
The personage for knowing this technology all can carry out modifications and changes under without prejudice to spirit and scope of the invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete with institute under technological thought without departing from disclosed spirit such as
Into all equivalent modifications or change, should be covered by claim of the invention.
Claims (10)
1. a kind of cipher input equipment, it is characterised in that including：
Electrical brain stimulation device, there is provided the visual stimulus of multiple difference fixed frequencies；
Eeg signal acquisition device, the EEG signals of user are gathered by lead；Wherein, the EEG signals are users according to close
Code and Password Policy, selection one is watched attentively and is produced from the visual stimulus of multiple difference fixed frequencies；
Input unit, is connected with the eeg signal acquisition device, for from described in eeg signal acquisition device collection
Steady State Visual Evoked Potential feature is extracted in EEG signals, according to Password Policy by the Steady State Visual Evoked Potential Feature Conversion
Into the password, and it is transferred to encryption device.
2. cipher input equipment according to claim 1, it is characterised in that：The Password Policy include the password with it is many
Relation between the visual stimulus of individual different fixed frequencies.
3. cipher input equipment according to claim 1, it is characterised in that：The cipher input equipment also includes that control is filled
Put, the control device is connected with the electrical brain stimulation device, the eeg signal acquisition device and input unit respectively；
For adjusting and controlling the electrical brain stimulation device, the eeg signal acquisition device and the input unit.
4. cipher input equipment according to claim 3, it is characterised in that：The eeg signal acquisition device includes：
Brain electricity cap for being worn over user's head；
Electrode for gathering the EEG signals, it is arranged on brain electricity cap；
Amplifier for amplifying the EEG signals, it is connected with the electrode.
5. cipher input equipment according to claim 3, it is characterised in that：The electrical brain stimulation device is used to be sent out by multiple
The stimulation panel of light device composition；And multiple photophores are flashed with different fixed frequencies respectively.
6. cipher input equipment according to claim 5, it is characterised in that：It is described stimulate panel and the control device it
Between communicated by bluetooth module.
7. cipher input equipment according to claim 5, it is characterised in that：The input unit includes：
Receiver module, is connected with the eeg signal acquisition device, the institute for receiving the eeg signal acquisition device collection
State EEG signals；
Data acquisition module, is connected with the receiver module, for the brain electricity received according to the asynchronous interception of time slip-window
Signal, obtains the eeg data in the unit interval；
Pretreatment module, for being filtered pretreatment to the eeg data for obtaining；
Analysis module, the Sequence Detection based on Canonical Correlation Analysis is carried out for the eeg data after to filter preprocessing
Treatment, extracts and obtains the Steady State Visual Evoked Potential feature；
Password modular converter, for the Steady State Visual Evoked Potential feature extracted to be converted into institute according to the preset strategy
State password；
Communication module, for the password transmission for obtaining to the encryption device will to be changed.
8. cipher input equipment according to claim 7, it is characterised in that：The control module sets multiple described luminous
Fixed frequency, the time slip-window and the Password Policy that device flashes.
9. a kind of cipher-code input method, it is characterised in that：It is applied to cipher input, and the cipher input and brain electricity
Signal pickup assembly is connected；The cipher-code input method includes：
Reception comes from the EEG signals of the eeg signal acquisition device；Wherein, the EEG signals are users according to password
And Password Policy, selection one is watched attentively and is produced from the visual stimulus of the multiple difference fixed frequency of electrical brain stimulation device；
According to the EEG signals that the asynchronous interception of time slip-window is received, the eeg data in the unit interval is obtained；
The eeg data to obtaining is filtered pretreatment；
The eeg data after to filter preprocessing carries out the Sequence Detection based on Canonical Correlation Analysis and processes, and extracts and obtains
The Steady State Visual Evoked Potential feature；
The Steady State Visual Evoked Potential feature extracted is converted into the password according to the Password Policy；
The password that transmitting and converting is obtained is to encryption device；
Wherein, the Password Policy includes the relation between the visual stimulus of password fixed frequency different from multiple.
10. cipher-code input method according to claim 9, it is characterised in that：Multiple visions of the electrical brain stimulation device
The fixed frequency of stimulation, the Password Policy and the time slip-window are to set to generate beforehand through control module.
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