CN104935424B - For removing the device of carrier signal - Google Patents
For removing the device of carrier signal Download PDFInfo
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- CN104935424B CN104935424B CN201510289554.2A CN201510289554A CN104935424B CN 104935424 B CN104935424 B CN 104935424B CN 201510289554 A CN201510289554 A CN 201510289554A CN 104935424 B CN104935424 B CN 104935424B
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Abstract
The invention discloses a kind of for removing the device of carrier signal comprising sequentially connected Acquisition Circuit, rectification circuit and carrier wave remove circuit.Wherein, Acquisition Circuit is for acquiring electromagnetic signal.Rectification circuit is for rectifying the electromagnetic signal of acquisition.Carrier wave removal circuit is used to remove the carrier signal of rectified electromagnetic signal, and carrier wave removal circuit includes based on LC filter circuit and with the low-pass filter circuit of belt-resistance function.Circuit structure of the invention is simple, avoids and introduces external power supply and design crystal oscillator；Of the invention is easy to operate, and precision is high, avoids the carrier wave removal circuit of Rule university research personnel design using the defect for not being suitable for high-frequency circuit caused by RC filter circuit, greatly facilitates the attack of side channel electromagnetic.
Description
Technical field
The present invention relates to communication technique fields more particularly to a kind of for removing the device of carrier signal.
Background technique
With the fast development of the network information technology, the medium using authentication and financial payment is more and more, such as silver
Row IC card, U-shield, social security card, identity card, mobile-phone payment etc..In order to guarantee financial safety of payment and privacy of user, this kind of payment is eventually
End is currently the password integrated circuit using cryptographic algorithm as foundation for security.Password integrated circuit relates to cryptographic algorithm, key etc.
Key message will necessarily person under attack attack, attacker illegally reads encryption device, analyzed, it is quick to obtain to dissect
Feel information and unlawful interests.Therefore the safety of encryption device is evaluated and tested and is increasingly taken seriously.Side-channel attack extracts
Key is a kind of important way for evaluating intellective IC card safety.With the application of China's national secret algorithm, current country's detection machine
The common import equipment of structure has been unable to satisfy the needs of China's chip security detection.In order to break current domestic testing agency
Detection device largely relies on the awkward situation of import, and solves the critical issue that equipment is unable to secondary development, therefore autonomous research and development
Concern of the chip security detection platform increasingly by academia and industry.It wherein carries out in side channel electromagnetic attack equipment
Key link is the removal of the acquisition and carrier wave to electromagnetic signal, therefore is to influence side channel electricity on the design of carrier wave removal device
The key of magnetic success attack.
By taking carrier wave is the Non-contact Intelligent IC Card of 13.56MHz as an example, the resonance frequency of intellective IC card and the hair of card reader
Send frequency identical, intellective IC card will obtain energy by exchange electromagnetic field, so as to cause the variation of card reader antenna end electric current.Intelligence
Can IC card antenna end load resistance can by MCU (Microcontroller Unit, micro-control unit) according to communication protocol and
Digital baseband signal control load resistance is constantly turned on or off, and the off and on of load resistance can cause card reader end
The variation of internal resistance both end voltage, card reader detect that communication of the intellective IC card end to card reader is completed in this variation.This data
The method of transmission, which is referred to as, loads modulator approach.
Intellective IC card is a kind of encryption device, and the realization of encryption device depends on internal hardware mostly, and hardware is being added
The physical messages such as power consumption, electromagnetic radiation, sound are inevitably revealed during decryption, these information become bypass letter
Breath.For in the side Multiple Channel Analysis method of smart card, power consumption analysis is only effective to contact intelligent card, and EMP attack N can divide
Analysis contact intelligent card also can analyze contact type intelligent card.Therefore obtaining effective electromagnetic information is the attack of side channel electromagnetic
Key.When due to attacking using electromagnetic signal contact type intelligent card, the electromagnetism with key related operations is collected
Signal is very faint, and there are the carrier signals that the king-sized carrier wave of amplitude is 13.56MHz in radiofrequency signal, and measure system
The interference of the factors such as the various amplitude and phase noises inside system and card causes the useful electromagnetic signal of acquisition to be blanked,
Therefore it needs to pre-process electromagnetic signal by certain means, reduces significantly shadow of the carrier wave to useful electromagnetic signal
It rings.
2011 chip manufacturer's grace intelligence Pu semiconductor (NXP Semiconductors) Mifare family chip
MF3ICD40 chip by German Rule university (Bochum；RUB researcher) utilizes side-channel attack
Mode crack, the equipment that cracks designed by them wants 3000 dollars.This event forces NXP company by this by NASA, old
The widely used chip of the client in Kingsoft, Australia and Czech upgrades.Specifically, the scheme of German Rule university is to draw
Out the carrier wave of 13.56MHz then carry out decaying and phase shift finally and the signal of probe acquisition carry out subtraction after amplify and believe out
Number.Wherein key modules are to carry out decaying and phase shift, and DC power supply is needed additionally to be powered.However, additional power supply will necessarily
Introduce noise；And the matching of phase and amplitude is carried out using simple RC circuit, it is realized using two adjustable resistances to decaying
The control of the transmission function of circuit and phase-shift circuit.This control method is inconvenient for operation, while precision is not high.They are in circuit
It is middle that an independent crystal oscillator is used to go the standard sine wave for generating 13.56MHz as carrier wave, due to different from the crystal oscillator of card reader
Source, it will cause two input terminals of subtracter to have different disturbances, so that having carried out superposition in circuit reduces signal-to-noise ratio.
Summary of the invention
The technical problems to be solved by the present invention are: the carrier wave designed in the prior art by German Rule university research personnel
It removes the following defect of circuit: DC power supply being needed additionally to be powered；Of phase and amplitude is carried out using RC filter circuit
Match, realizes that the control to the transmission function of attenuator circuit and phase-shift circuit, control method operation is not square using two adjustable resistances
Just, precision is not high；It needs to quote independent crystal oscillator, reduces signal-to-noise ratio；It is at high cost.
In order to solve the above-mentioned technical problems, the present invention provides a kind of convenience, simple, expansible, at low cost for going
Except the device of carrier signal, the acquisition and pretreatment of side channel electromagnetic information are aimed at, and realizes electricity in AFE(analog front end)
The removal of carrier wave in magnetic signal.
Technical solution of the present invention are as follows:
It is a kind of for removing the device of carrier signal, comprising:
Acquisition Circuit, for acquiring electromagnetic signal；
Rectification circuit is connect with the Acquisition Circuit, for rectifying to the electromagnetic signal；And
Carrier wave removes circuit, connect with the rectification circuit, for removing the carrier signal of rectified electromagnetic signal；
The carrier wave removal circuit includes based on LC filter circuit and with the low-pass filter circuit of belt-resistance function.
Preferably, the low-pass filter circuit includes the first inductance, the second inductance, third inductance, first capacitor and the
Two capacitors；Wherein
The signal output end of the rectification circuit is gone by carrier wave described in second inductance and first inductance connection
Except the signal output end of circuit；
The signal output end of the rectification circuit also passes through second inductance and second capacity earth；
The signal output end of the carrier wave removal circuit is grounded by the first capacitor and the third inductance.
Preferably, above-mentioned for remove the device of carrier signal to further include the detection connecting with the low-pass filter circuit
Adjust circuit.
Preferably, it includes first resistor and second resistance that the detection, which adjusts circuit, and the first resistor is that sliding becomes
Hinder device；Wherein
The signal output end of the low-pass filter circuit is connect by the resistance wire and the second resistance of the first resistor
Ground；
The signal output end of the low-pass filter circuit is also connect with the slide bar of the first resistor.
Preferably, the resistance value of the second resistance is less than 500 Ω.
Preferably, the Acquisition Circuit includes aerial coil.
Preferably, the Acquisition Circuit further includes radio frequency (RF) coaxial connector, and the aerial coil is same by the radio frequency
Mandrel connector is connect with the rectification circuit.
Preferably, the rectification circuit includes the bridge rectifier for the alternating voltage of input to be switched to DC voltage
Device.
Preferably, the bridge rectifier includes first diode, the second diode, third diode and the four or two pole
Pipe；Wherein
First signal output end of the Acquisition Circuit is connect with the anode of the first diode, the first diode
Cathode connect the signal output end of the rectification circuit；
First signal output end is also connect with the cathode of the third diode, and the anode of the third diode connects
Ground；
The second signal output end of the Acquisition Circuit is connect with the anode of second diode, second diode
Cathode connect the signal output end of the rectification circuit；
The second signal output end is also connect with the cathode of the 4th diode, and the anode of the 4th diode connects
Ground.
Preferably, the first diode, the second diode, third diode and the 4th diode are Schottky two
Pole pipe.
Compared with prior art, one or more embodiments in above scheme can have following advantage or beneficial to effect
Fruit:
With the application of the invention, being used to reduce the waveform of carrier frequency influenced and be retained in frequency band near carrier frequency
Low-pass filter based on LC filter circuit and with belt-resistance function removes circuit as carrier wave.Germany in compared with the prior art
The carrier wave of Rule university research personnel design removes circuit, and the circuit structure of the embodiment of the present invention is simple, and it is external to avoid introducing
Power supply and design crystal oscillator.In addition, of the invention is easy to operate, precision is high, avoids the carrier wave of Rule university research personnel design
Removal circuit greatly facilitates the attack of side channel electromagnetic using the defect for not being suitable for high-frequency circuit caused by RC filter circuit.
Other features and advantages of the present invention will be illustrated in the following description, and partly becomes from specification
It is clear that understand through the implementation of the invention.The objectives and other advantages of the invention can be by wanting in specification, right
Specifically noted structure is sought in book and attached drawing to be achieved and obtained.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example and is used together to explain the present invention, be not construed as limiting the invention.In the accompanying drawings:
Fig. 1 shows the structural schematic diagram of device of the embodiment of the present invention for removing carrier signal；
It is used to remove the circuit diagram of the device of carrier signal Fig. 2 shows the embodiment of the present invention；
Fig. 3 shows the spectrum diagram of subcarrier load modulation in international standard；
Fig. 4 shows the amplitude-frequency response figure of device of the embodiment of the present invention for removing carrier signal；
Fig. 5 shows the carrier wave removal effect schematic diagram that the embodiment of the present invention is applied for domestic card；
Fig. 6 shows the carrier wave removal effect schematic diagram for state's wild card application embodiment of the present invention；
Fig. 7 shows the flow diagram that carrier wave removal is carried out using the embodiment of the present invention.
Specific embodiment
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and examples, how to apply to the present invention whereby
Technological means solves technical problem, and the realization process for reaching technical effect can fully understand and implement.It needs to illustrate
As long as not constituting conflict, each feature in each embodiment and each embodiment in the present invention can be combined with each other,
It is within the scope of the present invention to be formed by technical solution.
The technical problems to be solved by the present invention are: the carrier wave designed in the prior art by German Rule university research personnel
It removes the following defect of circuit: DC power supply being needed additionally to be powered；Of phase and amplitude is carried out using RC filter circuit
Match, realizes that the control to the transmission function of attenuator circuit and phase-shift circuit, control method operation is not square using two adjustable resistances
Just, precision is not high；It needs to quote independent crystal oscillator, reduces signal-to-noise ratio；It is at high cost.In order to solve the above technical problems, of the invention
Embodiment provides a kind of for removing the device of carrier signal.
Fig. 1 shows the structural schematic diagram of the device for removing carrier signal of the embodiment of the present invention.Referring to Fig.1, originally
The device that inventive embodiments are used to remove carrier signal includes sequentially connected Acquisition Circuit 1, rectification circuit 2 and carrier wave removal electricity
Road 3.
Specifically, Acquisition Circuit 1 is for acquiring electromagnetic signal.Rectification circuit 2 is used for the electromagnetic signal that Acquisition Circuit 1 acquires
It is rectified.Carrier wave removal circuit 3 is used to remove the carrier signal of rectified electromagnetic signal.Particularly, carrier wave removes circuit 3
Including based on LC filter circuit and with the low-pass filter circuit of belt-resistance function.
In the present embodiment, it in order to reduce the influence of carrier frequency and be retained in the waveform of frequency band near carrier frequency, adopts
The low-pass filter based on LC filter circuit and with belt-resistance function is used to remove circuit 3 as carrier wave.In compared with the prior art
The carrier wave of German Rule university research personnel design removes circuit, and the circuit structure of the embodiment of the present invention is simple, avoids introducing
External power supply and design crystal oscillator.In addition, the embodiment of the present invention is easy to operate, precision is high, avoids Rule university research personnel
The carrier wave removal circuit of design greatly facilitates side channel using the defect for not being suitable for high-frequency circuit caused by RC filter circuit
EMP attack N.
It is used to remove the circuit diagram of the device of carrier signal, above-mentioned low-pass filtering Fig. 2 shows the embodiment of the present invention
Circuit includes the first inductance L1, the second inductance L2, third inductance L3, first capacitor C1 and the second capacitor C2.
Referring to Fig. 2, the signal output end of rectification circuit 2 passes through the second inductance L2 and the first inductance L1 connection carrier wave removal electricity
The signal output end on road 3, the signal output end of rectification circuit 2 also pass through the second inductance L2 and the second capacitor C2 ground connection.Carrier wave is gone
Except the signal output end of circuit 3 is grounded by first capacitor C1 and third inductance L3.
Below with reference to the carrier wave removal for carrying out channel electromagnetic attack in side for the encryption device that carrier frequency is 13.56MHz
Circuit 3 elaborates design process and design principle of the invention.
Common diode detection circuit is using RC low-pass filter.Since RC low-pass filter has consume, and visit
Head acquisition electromagnetic signal it is very faint, therefore the lossy characteristic of RC low-pass filter be unfavorable for signal demodulation it is defeated
Out.In addition, RC low-pass filtering is generally used for low frequency signal, circuit filtering effect is also good without LC filter circuit.LC filtered electrical
The resistance of the inductance on road is small, and DC losses are small, big to the induction reactance of alternating current, and good wave filtering effect is very suitable to apply in high-frequency electrical
Lu Zhong.In addition, the Non-contact Intelligent IC Card system that carrier frequency is high frequency 13.56MHz loads tune using by subcarrier
The frequency spectrum of system, subcarrier modulation is as shown in Figure 3.In practical application, electromagnetic signal interested to attacker all will be by
The carrier modulation of 13.56MHz, from frequency domain, they will become apparent from the sideband in the two sides 13.56MHz, therefore design simulation front end
Demodulator circuit, it will by frequency spectrum translation, finally design the signal that filter circuit filters out carrier wave.In order to guarantee that circuit is filtering off
The electromagnetic signal nearby with crypto chip work leakage is not filtered off while the high-frequency signal of 13.56MHz, therefore needs to inhibit high
The band signal for retaining nearby carriers while frequency 13.56MHz carrier wave, additionally, due to the frequency signal for being greater than twice carrier wave
The relevant signal of crypto-operation can be interfered, therefore the signal higher than twice of 13.56MHz is also required to be filtered.Therefore originally
Invention devise based on LC filter circuit and to high frequency 13.56MHz frequency inhibited based on LC filter circuit and with band
Hinder the low-pass filter of function.
In EMP attack N, AFE(analog front end) removal carrier wave improves the signal-to-noise ratio of final card electromagnetic signal.Eliminate carrier wave
Influence of the electromagnetic radiation to electromagnetic signal signal-to-noise ratio is the critical problem of EMP attack N.Referring to Fig. 2, in order to inhibit to carry as far as possible
The frequency of wave 13.56MHz but the appropriate frequency retained near 13.56MHz, setting trap frequency is 13.56MHz, cutoff frequency
In 10MHz or so, characteristic impedance is set as 50 ohm.Because circuit, which needs the requirement met, to be fallen near 13.56MHz
Wave is filtered high-frequency noise needs, and it is attached to cutoff frequency to deduce mode filter according to m the characteristics of the design of LC filter
Close signal has very big attenuation, and constant-K filter has stronger attenuation from the farther away signal of cutoff frequency,
So devising constant-K filter and m deduction mode filter combinational circuit to adapt to the needs of side channel electromagnetic attack.
In order to realize the matching of filter Yu characteristic impedance (50 ohm), it is proposed that the filter of design m=0.6 or so.It enables
Trap frequency is 13.56MHz.The first inductance L1, the second inductance L2, third inductance L3, are calculated separately according to following expression
The component value of one capacitor C1 and the second capacitor C2.
The calculating formula of mode filter is deduced by m:
Cutoff frequency can be obtained:
fIt cuts≈10×106Hz.Meet the requirement near 13.56MHz.
The first inductance L1 and third inductance are obtained according to the relevant calculation formula of the inductance and capacitor of deducing mode filter by m
The inductance value of L3 and the capacitance of first capacitor C1.
The inductance value and the second capacitor C2 of the second inductance L2 is obtained according to the inductance capacitance calculating formula of constant-K filter
Capacitance.
Fig. 4 shows the amplitude-frequency response figure of device of the embodiment of the present invention for removing carrier signal.Referring to Fig. 4, carrying
Wave frequency rate, which is equal at 13.56MHz, there is very big trap, to adequately be inhibited to 13.56MHz.Compared to not applicable
In the RC filter of high-frequency signal, carrier wave removal circuit 3 provided in an embodiment of the present invention is met is for carrier frequency
The needs of the crypto chip of 13.56MHz.
In a preferred embodiment of the invention, in order to be directed to the demand of different cards, for removing carrier signal
Device further includes that detection adjusts circuit 4.It includes that adjustable resistance can by adjusting the resistance value of adjustable resistance that detection, which adjusts circuit 4,
The charge and discharge time for changing capacitor in carrier wave removal circuit 3, to realize effective detection.
Referring now still to Fig. 2, in a preferred embodiment of the invention, the device that the present invention is used to remove carrier signal further includes
The detection connecting with low-pass filter circuit adjusts circuit 4.It includes first resistor R1 and second resistance R2 that detection, which adjusts circuit 4, the
One resistance R1 is slide rheostat.
Specifically, the signal output end of low-pass filter circuit is connect by the resistance wire and second resistance R2 of first resistor R1
Ground.The signal output end of low-pass filter circuit is also connect with the slide bar of first resistor R1.The resistance value of second resistance R2 is preferably small
In 500 Ω.In a preferred embodiment of the invention, the resistance value of second resistance R2 is selected as 200 Ω.Total resistance value of first resistor R1
For 1000 Ω, the resistance value actually connected into circuit is 1000 Ω × 30%=300 Ω.
It is to carry out carrier wave removal electromagnetic signal extraction effect figure for a actual domestic card shown in Fig. 5 a and Fig. 5 b,
Wherein Fig. 5 a shows the schematic diagram of probe acquisition signal, and Figure 5b shows that the schematic diagrames of the signal after removal carrier wave.Fig. 6 a and
It is to carry out carrier wave removal electromagnetic signal extraction effect figure for a actual external card shown in Fig. 6 b, wherein Fig. 6 a is shown
The schematic diagram of probe acquisition signal, Fig. 6 b show the schematic diagram of the signal after removal carrier wave.Fig. 5 a and Fig. 5 b demonstrate this hair
The bright validity for domestic card, Fig. 6 a and Fig. 6 b demonstrate the present invention for the validity of external card.
In a preferred embodiment of the invention, in order to improve signal-to-noise ratio and electromagnetism collecting efficiency, the present invention passes through coiling
Inductance coil (i.e. aerial coil) extracts electromagnetic information, avoids near field electromagnetic probe and needs continuous transformation and acquisition angle and side
To defect.Particularly, Acquisition Circuit 1 further includes radio frequency (RF) coaxial connector, aerial coil by radio frequency (RF) coaxial connector with it is whole
Current circuit 2 connects.
In a preferred embodiment of the invention, rectification circuit 2 includes for the alternating voltage of input to be switched to direct current
The bridge rectifier of pressure.
Specifically, bridge rectifier includes first diode D1, the second diode D2, third diode D3 and the four or two pole
Pipe D4.Wherein, the first signal output end of Acquisition Circuit 1 is connect with the anode of first diode D1, the yin of first diode D1
The signal output end of pole connection rectification circuit 2.First signal output end is also connect with the cathode of third diode D3, the three or two pole
The plus earth of pipe D3.The second signal output end of Acquisition Circuit 1 is connect with the anode of the second diode D2, the second diode D2
Cathode connection rectification circuit 2 signal output end.Second signal output end is also connect with the cathode of the 4th diode D4, and the 4th
The plus earth of diode D4.Particularly, first diode D1, the second diode D2, third diode D3 and the 4th diode
D4 is Schottky diode.
Below with reference to the Acquisition Circuit 1 for carrying out channel electromagnetic attack in side for the encryption device that carrier frequency is 13.56MHz
Design process and design principle of the invention are elaborated with rectification circuit 2.
Since in intellective IC card, the electromagnetic carrier wave signal received is carried out frequency dividing to obtain pair by analog front circuit
Carrier wave.For the Non-contact Intelligent IC Card work system of 13.56MHz, 16 frequency dividings will be carried out to carrier wave to generate pair
Carrier wave, the frequency of subcarrier are 847KHz.The intellective IC card digital signal to be sent is modulated using Manchester's code and ASK,
Its transmission rate is 106kb/s, and the switch of control intellective IC card antenna end load resistance is removed with the subcarrier signal modulated,
Carrier signal is finally modulated, and finally generates the radio frequency output of needs.In order to realize that electromagnetic signal is extracted and carrier wave is gone
It removes, is realized first by inductance coil (aerial coil) and the resonance of electromagnetic signal is extracted.Then because electromagnetism is believed in smart card
The characteristics of number transmission: ASK amplitude-shift keying mode devises the bridge architecture that is made of four diodes and carries out the whole of electromagnetic signal
Stream.This is because exchange utilization efficiency can be improved and reduce diode and bear most by the bridge-type connection of four diodes
Big backward voltage.Circuit output is the constant voltage in a direction, and the exchange utilization rate of bridge rectifier is 100%, and
The load current of circuit diode is only the half of halfwave rectifier, solves classical diode envelope detector stage easy burn-out circuit board
The problem of.
Particularly, in order to adapt to the diode that high frequency detection characteristic needs to select adaptation high frequency ac signal, for constituting
Four diodes of rectification circuit are both preferably Schottky diode.Schottky diode belongs to high current, low-power consumption, ultrahigh speed
Semiconductor rectifier device, its feature are that reverse recovery time is very short, and value small can arrive several nanoseconds, meet the need of high-frequency signal
It wants.Therefore using Schottky diode is also to carry out the attack of side channel electromagnetic for carrier frequency for 13.56MHz encryption device
Key.
From the perspective of manufacturing cost, the defect at high cost compared to the carrier wave of German Rule university removal module (is needed
Want 3000 dollars), circuit devcie of the invention is few and structure is simple, has apparent price advantage.
Fig. 7 shows the flow diagram that carrier wave removal is carried out using the embodiment of the present invention.Referring to Fig. 7, the present invention is utilized
The process that embodiment carries out carrier wave removal mainly includes the following steps that 1 to step 6.
Step 1: according to the circuit for the device for being used to remove carrier signal described in Fig. 2 building embodiment of the present invention, and will
The signal output port of the device connects oscillograph.
Step 2: inductance coil (aerial coil) is placed on encryption device (smart card) surface just at work.
Step 3: adjusting the slide bar of first resistor R1, the variation of electromagnetic signal on observation oscilloscope.Referring to Fig. 5 a, can see
Electromagnetic signal is gone out from can not observe that apparent signal characteristic the different signal characteristic of height occurs to signal.
Step 4: according to the variation of signal, the optimum position of the sliding bar of first resistor R1 is determined, by suitable resistance
Value access circuit.
Step 5: a large amount of acquisition embodiment of the present invention are used to remove the output signal of the device of carrier signal, i.e. acquisition is passed through
Electromagnetism curve after carrier wave removal device.
Step 6: output signal is applied to CPA (Correlation Power Analysis, correlation power consumption analysis)
Or the mode of DPA (Differential Power Analysis, differential power consumption analysis) carries out analysis and extracts key.
It is worth noting that since different pcb board materials are different, and in the presence of parasitic when capacitor is connected with baseline
The reason of inductance can be adjusted slightly so each component value selected by the present invention only can be used as reference for actual circuit.Ability
Field technique personnel should be understood that the important link of side-channel attack is the extraction to useful signal, therefore to carrying in electromagnetic signal
The removal of wave will affect the success or failure of cipher key-extraction.
While it is disclosed that embodiment content as above but described only to facilitate understanding the present invention and adopting
Embodiment is not intended to limit the invention.Any those skilled in the art to which this invention pertains are not departing from this
Under the premise of the disclosed spirit and scope of invention, any modification and change can be made in the implementing form and in details,
But protection scope of the present invention still should be subject to the scope of the claims as defined in the appended claims.
Claims (9)
1. a kind of for removing the device of carrier signal, which is characterized in that it is the close of 13.56MHz for realizing carrier wave is directed to
Decoding apparatus implements the attack of side channel electromagnetic to remove the carrier signal in electromagnetic signal comprising:
Acquisition Circuit, for acquiring the electromagnetic signal generated when encryption device operation；
Rectification circuit is connect with the Acquisition Circuit, for rectifying to the electromagnetic signal；And
Carrier wave removes circuit, connect with the rectification circuit, for removing the carrier signal of rectified electromagnetic signal；It is described
Carrier wave removal circuit includes based on LC filter circuit and with the low-pass filter circuit of belt-resistance function, wherein the low-pass filtering
Circuit design is that constant-K filter and m deduce mode filter combinational circuit,
Wherein, the low-pass filter circuit includes the first inductance, the second inductance, third inductance, first capacitor and the second capacitor；Its
In
The signal output end of the rectification circuit removes electricity by carrier wave described in second inductance and first inductance connection
The signal output end on road；
The signal output end of the rectification circuit also passes through second inductance and second capacity earth；
The signal output end of the carrier wave removal circuit is grounded by the first capacitor and the third inductance.
2. the apparatus according to claim 1, which is characterized in that further include the detection tune being connect with the low-pass filter circuit
Economize on electricity road.
3. the apparatus of claim 2, which is characterized in that it includes first resistor and the second electricity that the detection, which adjusts circuit,
Resistance, the first resistor are slide rheostat；Wherein
The signal output end of the low-pass filter circuit is grounded by the resistance wire of the first resistor and the second resistance；
The signal output end of the low-pass filter circuit is also connect with the slide bar of the first resistor.
4. device according to claim 3, which is characterized in that the resistance value of the second resistance is less than 500 Ω.
5. device according to any one of claim 1 to 4, which is characterized in that the Acquisition Circuit includes aerial coil.
6. device according to claim 5, which is characterized in that the Acquisition Circuit further includes radio frequency (RF) coaxial connector, institute
Aerial coil is stated to connect by the radio frequency (RF) coaxial connector with the rectification circuit.
7. device according to any one of claim 1 to 4, which is characterized in that the rectification circuit includes for will be defeated
The alternating voltage entered switchs to the bridge rectifier of DC voltage.
8. device according to claim 7, which is characterized in that the bridge rectifier includes first diode, the two or two
Pole pipe, third diode and the 4th diode；Wherein
First signal output end of the Acquisition Circuit is connect with the anode of the first diode, the yin of the first diode
Pole connects the signal output end of the rectification circuit；
First signal output end is also connect with the cathode of the third diode, the plus earth of the third diode；
The second signal output end of the Acquisition Circuit is connect with the anode of second diode, the yin of second diode
Pole connects the signal output end of the rectification circuit；
The second signal output end is also connect with the cathode of the 4th diode, the plus earth of the 4th diode.
9. device according to claim 8, which is characterized in that the first diode, the second diode, third diode
It is Schottky diode with the 4th diode.
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| CN106712926B (en) * | 2016-11-21 | 2019-05-31 | 中国信息安全测评中心 | Signal processing method and device |
| CN110768779A (en) * | 2019-01-16 | 2020-02-07 | 哈尔滨安天科技集团股份有限公司 | Chip power supply circuit for preventing side channel information leakage |
| CN112532270B (en) * | 2020-10-28 | 2022-11-01 | 深圳市锐尔觅移动通信有限公司 | Radio frequency circuit, terminal equipment and radio frequency signal processing method |
| CN115664633B (en) * | 2022-12-27 | 2023-03-21 | 飞腾信息技术有限公司 | Waveform processing method and device |
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| CN104935424A (en) | 2015-09-23 |
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