CN100466516C - Biological identifying device and method for proofing replay attach - Google Patents

Biological identifying device and method for proofing replay attach Download PDF

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Publication number
CN100466516C
CN100466516C CNB2004100663434A CN200410066343A CN100466516C CN 100466516 C CN100466516 C CN 100466516C CN B2004100663434 A CNB2004100663434 A CN B2004100663434A CN 200410066343 A CN200410066343 A CN 200410066343A CN 100466516 C CN100466516 C CN 100466516C
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biological
terminal
biological characteristic
time
extracts
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CN1588851A (en
Inventor
梁敏
汪涤
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Miaxis Biometrics Co Ltd
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ZHONGZHENG BIOLOGICAL IDENTIFICATION TECHNOLOGY Co Ltd HANGZHOU
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Abstract

This invention relates to a biological certification device resisting playout attack. Apart from a bio-feature extraction module, it adds an independent real-time clock module communicating with the outside by a communication module. A data encipher/decipher module carries out data interaction with the up machine in the way of cipher text about the set of the clock module and time fetch. The bio feature extraction terminal A generates data with time information to be ciphered and inbound to a certification terminal b by shared network and B receives the ciphered time information is in the tolerant sphere first, if so, the biological certification is done.

Description

A kind of biological authentication method of resisting Replay Attack
Affiliated technical field
The present invention relates to a kind of biological authentication apparatus and system, especially a kind of biological authentication apparatus and method of resisting Replay Attack.
Background technology
Biological identification technology Biometrics is that verification terminal B extracts terminal A by biological characteristic, from being tested the measured biological characteristic T of people C on one's body CAfter (fingerprint, person's handwriting, vocal print, iris, face phase, gait, DNA etc.), check it whether with a certain legal biological characteristic T that puts on record C' identical, with confirm C whether with T C' process that conforms to of the identity of being claimed.
Biological characteristic extracts the authentication of terminal A and biometric authentication terminal B office diverse geographic location, is called the strange land biological identification.Present known strange land biological identification generally carries out information interaction by public network.Detailed process is:
1) verification terminal B extracts terminal A by biological characteristic, and the biological information I of people C is tested in picked-up C
2) station the biological characteristic extraction algorithm F that A holds T, from I CThe middle biological characteristic T that extracts C:
F T(I C)=T C
3) hold key K with A AEncrypt, form ciphertext:
Ek A[T C];
4) ciphertext is delivered to the B end from the A end via public network:
Ek A[T C]→B;
5) B end key K BDeciphering:
DK B{Ek A[T C]}=T C
6) use recognizer F VTo T CWith the T that puts on record C' relatively, provide authentication result:
F V(T C,T C’)=R C
7) hold key K with B BThe encrypted authentication result:
EK B[R C];
8) ciphertext is delivered to the A end from the B end via public network:
EK B[R C]→A.
Wherein the 3rd)~5) enciphering/deciphering in step is handled, be for prevent biological information when the public network Channel Transmission by eavesdropping, crack the safety measure of being taked, referring to Fig. 1.
But if the biological information of above-mentioned encryption is stolen in common signal channel, even assailant H need not decode ciphertext, with regard to the method for available Replay Attack (playback), deception biometric authentication terminal B makes Verification System lose public credibility.
As Fig. 2. shown in, when the A end will be encrypted biological attribute data Ek A[T C] 2.11 send into public network 2.2 after, after network attack end H2.4 eavesdropping, duplicating, think necessary moment, to biometric authentication terminal B2.3 this encryption biological attribute data Ek that duplicates that resets at H A[T C] ' 2.41; The B termination is received EK A[T C] ' after, and do not know that this information is replicated, resets, and response is decrypted as a rule, and compare in retrieval biological attribute data storehouse; To verify R as a result CEncrypt back EK B[R C] 2.31 send into public network channel 1.2; The assailant can intercept and capture object information EK equally B[R C], also can be with Copy Info EK B[R C] ' 2.42 mail to biological characteristic and extract terminal A2.1.
Summary of the invention
In order to overcome biological attribute data was duplicated, is subjected to Replay Attack by eavesdropping in the public network transmissions process potential safety hazard; the invention provides a kind of biological authentication apparatus and method of resisting Replay Attack; the biological characteristic of being protected, being had the internal clocking system by hardware encryption chip extracts terminal; biological attribute data added cover encrypted transmission behind the real-time marking; and in receiving terminal foundation " time window ", in order to identification, caution Replay Attack.
The present invention solves the technical scheme that above technical problem adopts:
The biological authentication apparatus of resisting Replay Attack of the present invention mainly comprises: a MCU microprocessor is finished the coordination of each functional module; Be coupled to the memory of MCU microprocessor, contain the instruction group of carrying out by the MCU microprocessor; One real-time clock module, this real-time clock module are to be electrically connected on the MCU microprocessor, in order to obtain to extract the precise time of biological characteristic; One biological characteristic extracting module, this biological characteristic extraction module are to be electrically connected on the MCU microprocessor, and via the control of this MCU microprocessor with the sensing biological information of human body, extract biological information; One SAM safety module, this SAM safety module is to be electrically connected on the MCU microprocessor, is used for finishing the encryption and decryption of data; Power module 4.3 provides the power supply of system; One communication module, this communication module is electrically connected on the MCU microprocessor, in order to carry out data communication with host computer.Connected mode between each module, as shown in Figure 4.Existing biological characteristic is extracted terminal A system hardware structure improved, promptly except biological characteristic extraction module 3.1, other increases real-time clock module 3.2, to obtain to extract the precise time of biological characteristic; Employing add separate/deciphering module 3.3 is above-mentioned two modules " encapsulation ", write to each other with extraneous via (externally carrying out the only passage of information exchange) communication module 3.4.At this moment, real-time clock module is an independently clock of system, and it is provided with and the time reads, can only be by its data enciphering/deciphering module outward of parcel, carry out data interaction with the mode and the host computer 3.5 of ciphertext.Referring to Fig. 3.
The biological authentication method of resisting Replay Attack of the present invention mainly comprises following steps:
1), accept the authentication application after, biological characteristic extracts terminal A and submits application synchronously to biological identification terminal B; Biological identification terminal B is in always and waits for reception authentication application state, receives that biological characteristic extracts the time synchronized application that terminal A sends, and after the clock information of biological identification terminal B system is encrypted, sends to biological characteristic and extracts terminal A;
2), after biological characteristic extracts terminal A and receives biological identification terminal B response, the time synchronization information that receives biological identification terminal B also is decrypted, and the system time that biological characteristic extracts terminal A is set;
3), biological characteristic extracts terminal A and extracts biological attribute data, extracts the system clock that biological characteristic extracts terminal A, generates the biological attribute data that has temporal information, after the encryption, enciphered message uploaded to biological identification terminal B by public network;
4), biological identification terminal B receives the enciphered message that biological characteristic extracts terminal A and deciphered, and whether within the range of permission at first judges its subsidiary temporal information, if meet the requirements, then carries out biological identification; If the time that biological attribute data is submitted to is considered as the suspicion of Replay Attack not within allowed band, authentication will not respond, and software flow forwards to and continues to wait for new authentication application; If time parameter meets the requirements, when biological characteristic is not inconsistent, system provides the unsanctioned prompting of checking, and flow process also changes over to and continues to wait for new authentication application; If biological characteristic conforms to, system provides the prompting that authentication is passed through.
The present invention reaches concrete grammar that its technical purpose takes as shown in Figure 5:
1) make biological characteristic extract the synchronous of terminal A and biological identification terminal B assurance clock:
/ t A-t B/<Δ t; T wherein B:The system clock information of biological identification terminal B instantaneous acquiring, t A:Biological characteristic extracts terminal A behind the clock information of receiving biological identification terminal B system, carries out the clock information of the adjusted extraction terminal of time synchronized A, Δ t---guarantee the maximum critical value of time synchronized;
2) biological characteristic extracts terminal A and extracts the biological characteristic value:
F T(I C)=T CI wherein C:Tested the biological information that people C is extracted on one's body; F T:Biological characteristic extracts function F T.; T C:With extracting function F TThe biological characteristic that from biological information, obtains;
3) add the clock that biological characteristic extracts the current system of terminal A, form real-time biological characteristic value:
T C+t A
4) extract the terminal A-key with biological characteristic and encrypt, transmit biological identification terminal B through public network;
EK A[T C+ t A] → B, wherein B is biological identification terminal B, Ek A:Extract the key of terminal A with biological characteristic
The function of encrypting;
5) biological identification terminal B secret key decryption:
DK B{ EK A[T C+ t A]=T C+ t ADK B:The function that is decrypted with the key of biological identification terminal B;
6) if time delay drops on the time window t of reasonable setting W1In, promptly/t B-t A/<t W1,
Declare T CEffectively, enter subsequent authentication program 7);
Otherwise
Declare T CFor invalid, the transmission of prompting biological characteristic value is overtime, stops checking;
7) start recognizer, provide recognition result:
F V(T C, T C')=R CF wherein VBe the recognizer of biological identification terminal B, T C': this biological characteristic that biological identification terminal B puts on record, R C: the result that two biological characteristics are discerned;
8) behind the current system time of adding, encrypted transmission is extracted terminal A to biological characteristic:
EK B[R C+ t B] → A; Wherein A is that biological characteristic extracts terminal A, EK B:The function of encrypting with the key of biological identification terminal B;
9) biological characteristic extracts terminal A deciphering:
DK A{ EK B[R C+ t B]=R C+ t BDK wherein A: the function that is decrypted with the key of biological identification terminal A;
10) if time delay drops on the time window t of reasonable setting W2In, promptly/t B-t A/<t W2,
Declare R CEffectively,
Otherwise
Declare R CFor invalid, prompting biological identification result transmission is overtime, stops checking.
The present invention can also be further perfect for the technical scheme that solves above technical problem and adopt:
One, can adopt the mode of foundation, realize that above-mentioned biological characteristic extracts the two ends clock synchronization of terminal A and biological identification terminal B with way handshake protocol:
1) biological characteristic extract terminal A with ciphertext when the biological identification terminal B application school:
EK A[T set]→B
2) biological identification terminal B deciphering:
DK B{EK A[T set]}=T set
3) biological identification terminal B gathers the local terminal clock and counts at once the time, and encrypts, and sends biological characteristic and extracts terminal A:
EK B[t B]→A
4) biological characteristic extracts terminal A deciphering, point value t when obtaining biological identification terminal B B:
DK A{EK B[t B]}=t B
5) biological characteristic extracts terminal A calibration local terminal clock:
t A=t B。。
Two, the time window of variable-size can be set at receiving terminal, to adapt to different safety class:
1) establishes the minimum time-delay of network t Min
2) time window t W=α * t Min, wherein α 〉=l is the time-delay coefficient, and to adapt to different safety class, α is big more, and the stability of a system is big more, but safe class is low more.
The invention has the beneficial effects as follows:
1), a kind of method that effectively prevents strange land biological identification Replay Attack, stopped up ubiquitous security breaches in the biological authentification system;
2) fail safe and the public credibility of biological authentification system, have been improved;
3), combination reality, enforcement easily.
Description of drawings
Fig. 1 biological authentification system constitutes schematic diagram;
Fig. 2 is that biological identification is subjected to the Replay Attack schematic diagram in public network;
Fig. 3 is system's formation schematic diagram that biological characteristic of the present invention extracts terminal;
Fig. 4 is that biological characteristic of the present invention extracts the terminal hardware structural representation;
Fig. 5 is that the present invention is a kind of method flow diagram that prevents that Replay Attack from adopting;
Fig. 6 is the hardware structure diagram of a preferred embodiment of the present invention;
Fig. 7 is the hardware circuit diagram of a preferred embodiment of the present invention;
Fig. 8 is that the biological characteristic of a preferred embodiment of the present invention extracts flow chart;
Fig. 9 is the biological identification terminal works flow chart of a preferred embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is further described.
Fig. 6 is the hardware structure diagram of a preferred embodiment of the present invention.Wherein communication module 6.1 is made up of communication interface circuit 6.11 and communication control circuit 6.12.Communication control circuit 6.12 is according to the instruction of MCU6.6, open respectively and biological characteristic extraction module 6.5 or with the data communication of host computer 6.7; Communication interface circuit 6.11 is converted into the RS-232 interface level that host computer 6.7 uses with the UART level of MCU; Increase the external memory storage of FLASH6.61, storage biological attribute data or other necessary datas as MCU.
Fig. 7 is the hardware circuit diagram of this preferred embodiment.Wherein: the 5th, 7 pin of MCU microprocessor U2 are Data Receiving/transmitting terminal.When carrying out Data Receiving/transmission, signal by the 13rd pin SERI, give the 10th pin SERI of communication control circuit CD4052BU5, after informing communication object, U5 is respectively by 1RDSM, 12TDSM or 5RDPC, 14TDPC, be communicated with the corresponding pin of communication interface circuit U6, reach the purpose of communicating by letter with biological characteristic extraction module J1 or host computer J2 respectively; Clock chip DS1302U7 the 6th pin DSSDA serial data line, under 5TIME, 7DSCLK sequencing control, with MCU carry out the extraction time/the setting-up time two-way exchange; SAM decipher circuit U9 2SAMRST resets, the 6SAMSDA data send pin and are connected at U2 the 35th, 34; U3 is the chip that resets of MCU; U4 is 2,000,000 FLASH, is connected with 40ATSCK, the 41ATST of MCU; U6 is the I/O interface chip, and effect is to be the RS-232 interface level with the UART level conversion.
Fig. 8 is that biological characteristic extracts terminal A in this preferred embodiment, extracts the flow chart of biological characteristic software.After system accepts authentication application 8.1, submit application 8.2 synchronously to verification terminal B, receive biological identification terminal B response, receive biological identification terminal B time synchronization information 8.3 and be decrypted 8.4, system time 8.5 is set, extracts biological attribute data 8.6, extract native system clock 8.7, generation has biological attribute data 8.8 that the time letter knows encrypt 8.9 after, enciphered data is uploaded to biological identification terminal B8.10 by public network
Fig. 9 is the software flow pattern of biological identification terminal B in this preferred embodiment.System is in always and waits for reception authentication application state 9.1, receives that biological characteristic extracts the time synchronized application 9.2 that terminal A sends, and after the clock information of native system is encrypted, sends to biological characteristic and extracts terminal A9.3.The enciphered message that receives A is then deciphered 9.4, at first judges its subsidiary temporal information whether within the range of permission 9.5, if meet the requirements, then carries out biological identification 9.6; If the time that biological attribute data is submitted to is considered as the suspicion of Replay Attack not within allowed band, authentication will not respond, and software flow forwards 9.1 to and continues to wait for new authentication application; If time parameter meets the requirements, when biological characteristic is not inconsistent, system provides the unsanctioned prompting of checking, and flow process also changes 9.1 over to and continues to wait for new authentication application.If biological characteristic conforms to, system provides the prompting 9.7 that authentication is passed through.

Claims (2)

1, a kind of biological authentication method of resisting Replay Attack, it is characterized in that: the method includes the steps of:
1), accept authentication application (8.1) after, biological identification terminal B is in the authentication application state (9.1) that receives of waiting for always, receive that biological characteristic extracts the time synchronized application (9.2) that terminal A sends, after the clock information encryption with biological identification terminal B system, send to biological characteristic and extract terminal A (9.3);
2), after biological characteristic extracts terminal A and receives biological identification terminal B response, the time synchronization information (8.3) that receives biological identification terminal B also is decrypted (8.4), and the system time (8.5) that biological characteristic extracts terminal A is set;
3), biological characteristic extracts terminal A and extracts biological attribute data (8.6), extract the system clock (8.7) that biological characteristic extracts terminal A, generation has the biological attribute data (8.8) of temporal information, after encrypting (8.9), enciphered message is uploaded to biological identification terminal B (8.10) by public network;
4), whether within the range of permission biological identification terminal B receives the enciphered message that biological characteristic extracts terminal A and deciphered (9.4), at first judge its subsidiary temporal information (9.5), if meet the requirements, then carries out biological identification (9.6); If the time that biological attribute data is submitted to is considered as the suspicion of Replay Attack not within allowed band, authentication will not respond, and software flow forwards biological identification terminal B to and is in always and waits for that receiving authentication application state (9.1) continues to wait for new authentication application; If time parameter meets the requirements, when biological characteristic is not inconsistent, system provides the unsanctioned prompting of checking, and flow process also changes biological identification terminal B over to and is in always and waits for that receiving authentication application state (9.1) continues to wait for new authentication application; If biological characteristic conforms to, system provides the prompting (9.7) that authentication is passed through;
This method specifically comprises:
1) make biological characteristic extract the synchronous of terminal A and biological identification terminal B assurance clock:
/ t A-t B/<Δ t; T wherein B: the system clock information of biological identification terminal B instantaneous acquiring, t A: biological characteristic extracts terminal A behind the clock information of receiving biological identification terminal B system, carries out the clock information of the adjusted extraction terminal of time synchronized A, Δ t---guarantee the maximum critical value of time synchronized;
2) biological characteristic extracts terminal A and extracts the biological characteristic value:
F T(I C)=T CI wherein C: tested the biological information that people C is extracted on one's body; F T: biological characteristic extracts function;
T C: with extracting function F TThe biological characteristic that from biological information, obtains;
3) add the clock that biological characteristic extracts the current system of terminal A, form real-time biological characteristic value:
T C+t A
4) extract the terminal A-key with biological characteristic and encrypt, transmit biological identification terminal B through public network;
EK A[T C+ t A] → B, wherein B is biological identification terminal B, Ek A: extract the function that the key of terminal A is encrypted with biological characteristic;
5) biological identification terminal B secret key decryption:
DK B{ EK A[T C+ t A]=T C+ t ADK B: the function that is decrypted with the key of biological identification terminal B;
6) if time delay drops on the time window t of reasonable setting W1In, promptly/t B-t A/<t W1,
Declare T CEffectively, enter subsequent authentication program 7);
Otherwise
Declare T CFor invalid, the transmission of prompting biological characteristic value is overtime, stops checking;
7) start recognizer, provide recognition result:
F V(T C, T C')=R CF wherein VBe the recognizer of biological identification terminal B, T C': this biological characteristic that biological identification terminal B puts on record, R C: the result that two biological characteristics are discerned;
8) behind the current system time of adding, encrypted transmission is extracted terminal A to biological characteristic:
EK B[R C+ t B] → A; Wherein A is that biological characteristic extracts terminal A, EK B: the function of encrypting with the key of biological identification terminal B;
9) biological characteristic extracts terminal A deciphering:
DK A{ EK B[R C+ t B]=R C+ t BDK wherein A: the function that is decrypted with the key of biological identification terminal A;
10) if time delay drops on the time window t of reasonable setting W2In, promptly/t B-t A/<t W2,
Declare R CEffectively,
Otherwise
Declare R CFor invalid, prompting biological identification result transmission is overtime, stops checking.
2, the biological authentication method of resisting Replay Attack according to claim 1 is characterized in that, adopts the mode of setting up with way handshake protocol, realizes that above-mentioned biological characteristic extracts the two ends clock synchronization of terminal A and biological identification terminal B:
1) biological characteristic extract terminal A with ciphertext when the biological identification terminal B application school:
EK A[T Set] → B, wherein T SetOrder when being the application school;
2) biological identification terminal B deciphering:
DK B{EK A[T set]}=T set
3) biological identification terminal B gathers the local terminal clock and counts at once the time, and encrypts, and sends biological characteristic and extracts terminal A:
EK B[t B]→A
4) biological characteristic extracts terminal A deciphering, point value t when obtaining biological identification terminal B B:
DK A{EK B[t B]}=t B
5) biological characteristic extracts terminal A calibration local terminal clock:
t A=t B
3, the biological authentication method of resisting Replay Attack according to claim 1 and 2 is characterized in that, at receiving terminal the time window of variable-size is set, to adapt to different safety class:
1) establishes the minimum time-delay of network t Min
2) time window t W=α * t Min, wherein α 〉=1 is the time-delay coefficient, and to adapt to different safety class, α is big more, and the stability of a system is big more, but safe class is low more.
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CN101478387B (en) * 2008-12-31 2012-02-15 成都市华为赛门铁克科技有限公司 Defense method, apparatus and system for hyper text transmission protocol attack
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