CN101034987B - Method and device for improving the security of the intelligent secret key - Google Patents
Method and device for improving the security of the intelligent secret key Download PDFInfo
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- CN101034987B CN101034987B CN2007100628167A CN200710062816A CN101034987B CN 101034987 B CN101034987 B CN 101034987B CN 2007100628167 A CN2007100628167 A CN 2007100628167A CN 200710062816 A CN200710062816 A CN 200710062816A CN 101034987 B CN101034987 B CN 101034987B
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Abstract
The invention discloses a method for improving intelligent secret key safety, comprising the steps of: 1. collecting and processing iris image of an identified person; 2. judging whether the iris image matches with the preset iris information: if yes, executing step 3 and otherwise end; 3. allowing the identified person to access intelligent secret key device; 4. the intelligent secret key devicemakes data operation. And the invention also provides a device for improving intelligent secret key safety. And the invention eliminates the hidden danger of the intelligent secret key device in userID authentication, and improves reliability and safety of the intelligent secret key device.
Description
Technical field
The present invention relates to the intelligent key field, particularly relate to a kind of method and device that utilizes the iris authentication technique to improve intelligent key safety.
Background technology
As everyone knows, modern society is the society of an advanced IT application, and information security has been penetrated into the various aspects of people's daily life.Simultaneously, because the develop rapidly of industries such as bank, traffic, network, communication, the related field of information security is also more and more wider.The difficulty and the importance of information security are also more and more outstanding.Identity authentication is just more and more paid attention to by people as the core technology of information security industry.Identity authentication is used to confirm the uniqueness and the legitimacy of identity.Identity authentication has quite widely in information such as bank, public security system and security fields to be used.For strengthening fail safe, increase work efficiency, require identity authentication must discern quickly and accurately by assessor's characteristic information, checking is by assessor's true identity.
Intelligent key apparatus is a kind of small hardware device that has processor and memory, is mainly used in fields such as authentication, software protection.Intelligent key apparatus is connected with computer through the data communication interface of computer, and has the key systematic function, but the safe storage key presets AES.The intelligent key apparatus computing relevant with key be fully at the device internal operation, and intelligent key apparatus has anti-characteristic of attacking, and fail safe is high.For example USB Key is a kind of intelligent key apparatus of USB interface, and its built-in single-chip microcomputer or intelligent card chip can be stored user's key or digital certificate.
In the prior art, whether intelligent key apparatus checking holder identity is legal generally is to realize through the PIN code of checking holder input.Because PIN code is merely one group of simple data, other people can through spy on, means such as decoding illegally obtain, thereby cause the significant data of preserving in the intelligent key apparatus to leak.
For strengthening the fail safe of intelligent key apparatus, prior art adds fingerprint, voice signal on intelligent key apparatus, and the user need can read the significant data in the intelligent key apparatus through behind the corresponding biological characteristic authentication.But biological characteristic such as fingerprint, voice signal is copied through biotechnology easily, makes this intelligent key apparatus aspect user's identity authentication, have certain potential safety hazard, and its reliability and fail safe be defectiveness still.Simultaneously, above-mentioned biometric devices cost is too high, is difficult for popularizing.
Summary of the invention
In view of this, the present invention provides a kind of method and device that improves intelligent key safety, solves intelligent key in the potential safety hazard that aspect user's identity authentication, exists, and improves its reliability and fail safe.
A kind of method that improves intelligent key safety of the present invention may further comprise the steps:
1) gathers and handle by assessor's iris image;
2) judge whether said iris image and the iris information that prestores mate, if execution in step 3; Otherwise finish;
3) allow to be visited intelligent key apparatus by the assessor;
4) intelligent key apparatus is operated data.
Preferably, said step 1 is specially:
11) gather by assessor's iris image;
12) iris image that collects is carried out preliminary treatment and generating feature vector.
Preferably, said step 4 is specially:
41) the inner generation of intelligent key apparatus key is right;
42) intelligent key apparatus carries out enciphering/deciphering or digital signature operation to data.
Preferably, said step 2 is specially:
Whether determining step 12 said characteristic vectors reach pre-conditioned with the matching degree of the individual features vector information that prestores; As reach pre-conditioned, then execution in step 3; Otherwise finish.
Preferably, said pre-conditioned be predefined threshold value.
Preferably, said step 1 is gathered by assessor's iris image, comprises that also collection is by the area and the retinal images information of assessor's pupil region internal reflection luminous point.
Preferably, said step 1 is specially:
A) input authentication password;
B) judge whether said password is correct, if execution in step c; Otherwise finish;
C) gather by assessor's iris image;
D) iris image that collects is handled also generating feature vector.
Preferably, said step b is specially:
When said password is correct, call the corresponding iris information of password, execution in step c.
Preferably, said step 2 is specially:
Judge whether the said characteristic vector and the matching degree of the individual features vector information that prestores reach pre-conditioned; As reach pre-conditioned, then execution in step 3, otherwise finish.(scheme of forming like this is complete scheme.Cannot directly quote power 1, not occur " characteristic vector " in 1) because weigh
Preferably, said pre-conditioned be predefined threshold value.
The present invention also provides a kind of device that improves intelligent key safety, comprises intelligent key unit, iris image detecting unit;
Said iris image detecting unit links to each other with said intelligent key unit, is used to gather and handle the iris image by the assessor;
Said intelligent key unit except that having key generation, digital signature, enciphering/deciphering processing capacity, is used to also judge whether said iris image detecting unit iris image of handling and the iris information that prestores mate.
Preferably, said intelligent key unit comprises:
Memory cell is used to store iris image information;
Match comparison module is used for more said iris image detecting unit iris image that collects and the iris information that is pre-stored in said memory cell, judges whether coupling.
Preferably, said memory cell further comprises:
The key data memory module, be used for the storing initial key to and/or root certificate authority certificate and/or initial password and/or user's private information;
The Template Information memory module, the iris image information that is used to store validated user;
The image data storage module, after being used to store said iris image detecting unit and handling by assessor's iris image information.
Preferably, said intelligent key unit also comprises:
Image data processing module is used for the iris image after analog/digital conversion is handled, the generating feature vector;
Said memory cell further comprises characteristics of image vector memory module, is used for the characteristics of image vector that the storing image data processing module generates.
Preferably, said iris image detecting unit comprises:
Image capture module is used to gather the iris image by the assessor;
Analog-to-digital converting module is used for the iris image that collects is carried out analog/digital conversion.
Compared with prior art, the present invention has the following advantages:
The present invention is at first to being carried out the iris feature authentication by the assessor, through after just allow to be visited intelligent key apparatus by the assessor, just can read the significant data of preserving in it by the assessor.Because of everyone iris feature all is unique, and there is not possibility imitated, that forge.Therefore, identify, can improve the reliability and the fail safe of intelligent key apparatus through iris feature to the user.In addition, because PIN code forgets easily, in a single day the user forgets Password, and will bring unnecessary trouble to its operation, and the biological characteristic of human body not tool lose property, so the present invention also can be used for improving the ease for use of intelligent key apparatus.
Description of drawings
Fig. 1 is the method for the invention flow chart;
Fig. 2 is the flow chart of the method for the invention embodiment;
Fig. 3 is a structure drawing of device according to the invention.
Embodiment
For make above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, below in conjunction with accompanying drawing and embodiment the present invention done further detailed explanation.
The iris of eyes is one deck physiology films that present gorgeous color around pupil, between pupil and sclera (being commonly called as white of the eye).Each iris all is unique, comprises the structure based on characteristics such as picture hat, crystalline, filament, spot, structure, concave point, ray, wrinkle and stripeds.Iris is to be made up of quite complicated fibr tissue, and its thin bilge construction just was determined with the mode of combination at random before birth.Iris has many characteristics such as stability, uniqueness, non-infringement property; Different people has different irises; Even same individual's right and left eyes, its iris also has many difference, and the possibility of two identical irises of nature generation is extremely small; Because iris is very little in people's variation in life, so iris is a kind of highly stable biological characteristic.
Iris image has stable directivity and frequency property.Directivity is meant that except that singular area iris image is in an enough little zone, and image texture is similar to the straight line that is parallel to each other.Direction characteristic is one of obvious characteristics in the iris image, and it reflects the grown form characteristic of iris image intuitively with the form of simplifying.Thereby the iris directivity is widely used in aspects such as the classification, enhancing, feature extraction of iris image.Frequency property is meant that in a regional area of iris image the texture of iris image distributes and is similar to envelope function.
Referring to Fig. 1, this figure is the method for the invention flow chart.
A kind of method that improves intelligent key safety of the present invention may further comprise the steps:
S10, collection are also handled by assessor's iris image.
The collection of iris image specifically is meant after image capture device focuses on user's iris, gathers by assessor's iris image.To the iris image that collects carry out preliminary treatment specifically comprise to iris image position, normalization and denoising.
The iris image location is meant confirms the position of iris in image.Iris image normalization is meant carries out standardization to the size of the iris image that collects.The normalized purpose of iris image is that every width of cloth original image is adjusted to identical size and correspondence position, thereby eliminates translation, convergent-divergent and the rotation harmful effect to iris recognition.The iris image denoising specifically is meant texture deformation and the non-iris image of eliminating iris image, like the pupil around the iris and the interference of sclera.If these disturb not filtering, with the accuracy of influence to iris image accuracy for processing and coupling.
Processing to the iris image that collects also comprises the conversion of carrying out analog/digital, generates digital information.
S20, judge whether said iris image and the iris information that prestores mate, if execution in step S30; Otherwise finish.
Judge that whether said iris image and the iris information that prestores are mated the result who is meant comparison and whether surpassed the threshold value that is provided with in advance, if surpass, represent that then this assessor passes through identity authentication.If do not surpass, represent that then this user does not pass through identity authentication.Intelligent key apparatus will mate comparative result and return main frame.
Common said threshold settings is that matching degree reaches 80%, representes that this assessor passes through identity authentication.
S30, permission are visited intelligent key apparatus by the assessor.
Permission is visited the significant data of storing in the intelligent key apparatus by the assessor, and intelligent key is confirmed by after assessor's the legal identity, allows shielded significant data of host service function and function thereof.
Because of everyone iris feature all is exclusive, be difficult for by imitated or forge, therefore to being carried out the iris feature authentication by the assessor, through after just allow to be visited intelligent key apparatus by the assessor, just can read the significant data of preserving in it by the assessor.The reliability and the fail safe of intelligent key apparatus have so just been guaranteed.
S40, intelligent key apparatus are handled data.
Intelligent key apparatus can comprise reading and writing, digital signature, enciphering/deciphering processing etc. to the operation that data are carried out, and it is right that the while intelligent key apparatus also can be used for generating key.
Referring to Fig. 2, this figure is the flow chart of the method for the invention embodiment.
S11, collection are by assessor's iris image.
The collection of iris image specifically is meant after image capture device focuses on user's iris, gathers by assessor's iris image.
Present embodiment can be accomplished by the collection of assessor's iris image through a CCD camera.This camera can be located autozoom for about 8 centimetres being positioned at optical detection unit by assessor's eyes, focus is focused on the iris, in case video camera iris is focused on, will images acquired.
S12, the iris image that collects is carried out preliminary treatment and generating feature vector.
Saidly be converted into digital signal by assessor's iris image through after gathering, the promptly said iris image of accomplishing through the CCD camera collection generates the digital signal that can be discerned by said intelligent key unit after analog/digital conversion.
Said digital signal is 8 gray level images, and the image that promptly obtains has the gray-scale colors of 256 grades, and this image signal of telecommunication by the conversion of CCD element that camera is inner carries out digitized processing and obtains.
Inside, intelligent key unit is to handling the generating feature vector through the digital signal after the analog/digital conversion.
Said digital signal generating feature vector with iris image is realized through Algorithm of Iris Recognition.Algorithm of Iris Recognition is meant through analyzing the figure in each circular grid, converts them to the iris code record.Because the iris image texture has stable directivity and frequency property, and Gabor (Jia Bo) conversion has the advantages that best time domain is connected resolution with frequency domain, can simultaneously image local direction and frequency be resolved, and can handle iris information well.Therefore, recognizer often realizes through the Gabor filter, promptly converts iris image into iris code through the Gabor filter.Each Gabor function all has centre frequency and the peak response angle of oneself.Aspect the feature extraction of Gabor filtering in image processing, the texture analysis many application are arranged.Generally select for use multi-direction, multiple dimensioned Gabor bank of filters to discern.The centre frequency of filter is more little, and the yardstick of the textural characteristics of extraction is big more.
Iris recognition technology converts the visual properties of iris to iris code (Iris Code), and this Code Template is stored so that later stage identification is used, and the amount of information that obtains from iris is very huge.The location of iris can be accomplished within 1 second simultaneously, and the time that produces iris code also only needs 1 second time.The retrieval time of database is also quite fast, in thousands of iris information databases are arranged, retrieves exactly, and the used time is also few.
Image preliminary treatment in the present embodiment selects the Gabor filter to accomplish Algorithm of Iris Recognition.In said algorithm, select a center of maximum frequency f
Max, and f
Max/ 2, f
Max/ 4, f
Max/ 8, for each centre frequency, select 4 phase angle θ=0 °, θ=45 °, θ=90 °.Such one has 12 Gabor filter channels.To the result of each channel filtering, we extract average E and variances sigma
2Characteristic as this passage.Therefore, for the iris image of each width of cloth input, multichannel Gabor filter extracts 24 characteristics altogether.
In the present embodiment, the characteristic vector of the every width of cloth iris image that extracts is represented that with the vector of one 24 dimension the difference of two kinds of textures just can be represented through the distance of these two vectors.
Judge whether the said characteristic vector and the matching degree of the individual features vector information that prestores reach pre-conditioned; As reach pre-conditioned, execution in step S30 then, otherwise finish.
The pre-conditioned threshold value that is provided with in advance that is.Usually threshold settings is that matching degree reaches 80% or 75%, when surpassing the threshold value of setting, shows that this has been passed through identity authentication by the assessor.
Certain said thresholding system can be set according to concrete actual conditions, repeats no more at this.
S30, individual features vector matching degree vectorial by assessor's biological characteristic and that prestore reach pre-conditioned, allow to be visited intelligent key apparatus by the assessor.
Such as threshold settings is that matching degree reaches 80%, so when by assessor's biological characteristic vector and the individual features vector matching degree that prestores more than or equal to 80% the time, will allow to be visited intelligent key apparatus by the assessor.
S31, intelligent key apparatus are handled data.
Intelligent key apparatus can comprise the operation that data are carried out reading and writing, digital signature, enciphering/deciphering handle, or the like.It is right that the while intelligent key apparatus can also generate key.
Preferred implementation of the present invention when obtaining by assessor's iris image, also can be obtained by assessor's some other characteristic signal, as by the area of pupil region internal reflection luminous point in assessor's iris image, retinal images information or the like.
With above-mentioned signal with superposeed by assessor's iris image after, be processed into the iris image characteristic vector by the said method of embodiment again, carry out matching ratio with the iris image Template Information.So just can further improve the reliability and the fail safe of identification.
Identity identifying method based on the body iris image proposed by the invention can also combine some other biometric technology, realizes the identity authentication of multi-biological characteristic information.
Preferred implementation of the present invention, said collection and processing are specially by assessor's iris image:
A) input authentication password.
On main frame, imported oneself identification number by the assessor, main frame sends the instruction of this assessor's iris information of inquiry to intelligent key apparatus, and this instruction comprises the identification number of user's input.
Authentication password of the present invention is not confined to identification number, can also be by other authentication modes such as assessor's fingerprint or other biological characteristics.In a lot of documents, very detailed description is all arranged as authentication password about fingerprint or other biological characteristic, repeat no more at this.
B) judge whether said password is correct, if execution in step c; Otherwise finish.
Whether intelligent key apparatus is searched corresponding iris information according to identification number or other authentication password and has been prestored in the intelligent key apparatus, and Query Result is returned main frame.
Also do not prestore in the intelligent key apparatus like this assessor's iris information, main frame carries out subsequent operation with termination, and to shown an error message by the assessor.In the intelligent key apparatus that prestored by assessor's iris information, execution in step c then.
C) gather by assessor's iris image.
The collection of iris image is meant after image capture device focuses on user's iris, gathers by assessor's iris image.
D) iris image that collects is handled also generating feature vector.
Saidly be converted into digital signal by assessor's iris image through after gathering, said digital signal is the generating feature vector after treatment.
Optimal way of the present invention had adopted authentication process before gathering iris image, further increased the fail safe of intelligent key.
The present invention also provides a kind of device that improves intelligent key safety, solves intelligent key in the potential safety hazard that aspect user's identity authentication, exists, and improves its reliability and fail safe.
Referring to Fig. 3, this figure is a structure drawing of device according to the invention.
The device of raising intelligent key safety according to the invention comprises iris image detecting unit 1, intelligent key unit 2.
Iris image detecting unit 1 links to each other with intelligent key unit 2; Be used to gather iris image by the assessor.
Intelligent key unit 2 is used to judge whether said iris image detecting unit 1 iris image that collects and the iris information that prestores mate.
Intelligent key unit 2 comprises memory cell and the match comparison module 25 that is used to store iris image information.
Memory cell further comprises key data memory module 27, Template Information memory module 24, image data storage module 21
Key data memory module 27, be used for the storing initial key to and/or root certificate authority certificate and/or initial password and/or user's private information.
Template Information memory module 24, the iris image information that is used to store validated user.
Image data storage module 21, after being used to store said iris image detecting unit 1 and handling by assessor's iris image information.
Intelligent key unit 2 comprises that also the iris image that is used for after analog/digital conversion handles, the image data processing module 22 of generating feature vector.
Memory cell further comprises the characteristics of image vector memory module 24 of the characteristics of image vector that is used for 22 generations of storing image data processing module.
Iris image detecting unit 1 comprises being used to gather by the IMAQ of assessor's iris image touches piece and analog-to-digital converting module.
Intelligent key unit 2 also comprises comparative result output module 26, firmware program memory module 28, intelligent key interface module 29 and host interface module 20.
Comparative result output module 26, the matching ratio that sends match comparison module 25 to main frame through host interface module 20 is than object information.
Firmware program memory module 28, be used for stored program, this program specifically can to generate key right in order to carry out, the program of data being carried out digital signature, enciphering/deciphering computing.
Intelligent key interface module 29 links to each other with iris image acquiring unit 1, realizes the mutual of information.
Used main frame to visit the significant data in the intelligent key unit 2 in advance by the assessor, need on main frame, to import personal identification number.Certain intelligent key of the present invention unit also can comprise input unit, can directly be indicated number through input unit input individual by the assessor.Main frame is sent to Template Information memory module 24 through host interface module 20 with personal identification number, and Template Information memory module 24 is searched the iris templates information that whether stores this assessor, and Query Result is returned main frame.Above-mentioned Template Information memory cell can be memories such as ROM, FLASH or EEPROM.
The present invention can further include authentication devices such as fingerprint acquiring unit or other biological signal acquiring unit, and is the same with the input identification number, further increases the fail safe of intelligent key system.The principle and the structure of authentication devices such as concrete fingerprint acquiring unit or other biological signal acquiring unit repeat no more at this.
Device according to the invention, preferable case also comprise the state indicating member, link to each other with intelligent key unit 2, are used to show various treatment states.
When not finding this assessor's iris templates information, main frame carries out subsequent operation with termination, and sends error message to the state indicating member.As when finding this assessor's iris templates information, then send the instruction of obtaining this assessor's iris information to iris image detecting unit 1 through intelligent key interface module 29.
Iris image acquiring unit 1 obtains by assessor's iris signal through the instrument of special use.The iris image that collects is carried out analog/digital conversion, the digital information of the iris image that generates is sent to intelligent key unit 2.By image data processing module 22, the generating feature vector.And the characteristic vector that will generate stores in the characteristics of image vector memory module 23.The characteristic vector of said iris information sends in the match comparison module 25 and compares the most at last, judges whether coupling.
Confirm this person's of being used identity when match comparison module 25, comparative result output module 26 sends comparative result information through host interface module 20 to main frame.Allow the significant data in the host access key data memory module 27 this moment.Be not identified by assessor's identity like this, main frame sends the identification error message, can show this information through the state indicating member.
Device according to the invention has utilized the uniqueness of people's iris feature, and iris does not have possibility imitated, that forge.Carried out iris image acquiring by 1 pair of iris image detecting unit by the assessor, carry out the characteristic authentication, allow to be visited intelligent key apparatus, use the significant data of preserving in it by the assessor through the back through the match comparison module 25 of intelligent key unit 2.Simultaneously intelligent key also capable of using unit 2 is carried out and is generated keys to important operations such as, digital signature, enciphering/deciphering processing.Device according to the invention has improved the reliability and the fail safe of intelligent key apparatus.
More than to a kind of method and device that improves intelligent key safety provided by the present invention; Carried out detailed introduction; Used concrete example among this paper principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof.Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (4)
1. a device that improves intelligent key safety is characterized in that, comprises intelligent key unit, iris image detecting unit, state indicating member;
Said iris image detecting unit links to each other with said intelligent key unit, is used to gather and handle the iris image by the assessor;
Said intelligent key unit; Except that having key generation, digital signature, enciphering/deciphering processing capacity; Also be used for according to being searched the iris templates information corresponding that whether prestores through the authentication password of input unit input with said authentication password by the assessor; If find,, the iris image that collects is carried out analog/digital conversion then by the collection of iris image detecting unit and handle saidly by assessor's iris image; Said intelligent key unit is handled the digital signal of carrying out through said iris Image Detection unit after the analog/digital conversion; The generating feature vector accesses the iris templates information corresponding with said authentication password, and carries out matching ratio with the iris feature vector by the assessor of gathering and handle the back acquisition;
Said iris image detecting unit links to each other with said intelligent key unit, is used to gather the iris image by the assessor;
Said iris image detecting unit comprises being used to gather by the IMAQ of assessor's iris image and touches piece and analog-to-digital converting module that said analog-to-digital converting module is used for the iris image that collects is carried out analog/digital conversion;
Said intelligent key unit also comprises memory cell, input unit, Template Information memory module;
Said memory cell is used to store iris image information;
Said input unit is used for directly being imported the individual by the assessor and indicates number; Main frame is sent to the Template Information memory module with said personal identification number; The Template Information memory module is searched the iris templates information that whether stores this assessor, and Query Result is returned main frame;
Said state indicating member links to each other with said intelligent key unit, and when not finding by assessor's iris templates information, main frame carries out subsequent operation with termination, and sends error message to the state indicating member; As when finding, then send the instruction of obtaining this assessor's iris information to said iris image detecting unit by assessor's iris templates information.
2. device according to claim 1 is characterized in that, said intelligent key unit also comprises:
Match comparison module is used for more said iris image detecting unit iris image that collects and the iris information that is pre-stored in said memory cell, judges whether coupling.
3. device according to claim 2 is characterized in that, said memory cell further comprises:
The key data memory module, be used for the storing initial key to and/or root certificate authority certificate and/or initial password and/or user's private information;
The image data storage module, after being used to store said iris image detecting unit and handling by assessor's iris image information.
4. device according to claim 3 is characterized in that, said intelligent key unit also comprises:
Image data processing module is used for the iris image after analog/digital conversion is handled, the generating feature vector;
Said memory cell further comprises characteristics of image vector memory module, is used for the characteristics of image vector that the storing image data processing module generates.
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| CN101034987A (en) | 2007-09-12 |
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