CN107907821A - The advanced method of discrimination of attack detecting sensor threshold value for safety chip - Google Patents
The advanced method of discrimination of attack detecting sensor threshold value for safety chip Download PDFInfo
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- CN107907821A CN107907821A CN201711030869.0A CN201711030869A CN107907821A CN 107907821 A CN107907821 A CN 107907821A CN 201711030869 A CN201711030869 A CN 201711030869A CN 107907821 A CN107907821 A CN 107907821A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2851—Testing of integrated circuits [IC]
- G01R31/2855—Environmental, reliability or burn-in testing
- G01R31/2856—Internal circuit aspects, e.g. built-in test features; Test chips; Measuring material aspects, e.g. electro migration [EM]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2851—Testing of integrated circuits [IC]
- G01R31/2855—Environmental, reliability or burn-in testing
- G01R31/2872—Environmental, reliability or burn-in testing related to electrical or environmental aspects, e.g. temperature, humidity, vibration, nuclear radiation
- G01R31/2874—Environmental, reliability or burn-in testing related to electrical or environmental aspects, e.g. temperature, humidity, vibration, nuclear radiation related to temperature
Abstract
The present invention relates to safety chip resistance against physical to attack field, for that can quickly recognize physical attacks, so as to perform safeguard procedures as early as possible.The present invention is as follows for the advanced method of discrimination of attack detecting sensor threshold value of safety chip, step：Step S1 originates for flow；In step S2, detect for the first time；In step S3, detected next time；In step S4, judge whether V1 exceeds threshold value；In step S5 S9, judge Δ V1 whether beyond standard deviation Δ V；Judge whether testing result variation tendency is identical three times；In step S10 S11, judge Δ V2 whether beyond standard deviation Δ V and on the difference that detects twice；In step S12, judge whether V2 is in danger zone；In step S13, V1=V2, Δ V1=Δ V2 are made, performs step S7.In step S14, alarm signal is produced, detection terminates.Present invention is mainly applied to chip secure to detect occasion.
Description
Technical field
The present invention relates to safety chip resistance against physical to attack field, more particularly to one kind judges attack detecting sensor detection knot
Whether fruit exceeds the advanced method of discrimination of threshold value.Concretely relate to advanced for the attack detecting sensor threshold value of safety chip
Method of discrimination.
Background technology
With the development of physical attacks technology, the information security of IC chip is faced with serious threat.For
Various physical attacks modes, safety chip often detect attack using detecting sensor.Some special attack means, such as
Temperature is attacked, it is generally recognized that one kind needs the slow attack means consumed a longer time.But new some temperature attack
Means, such as liquid nitrogen attack so that time rapid drawdown is implemented in temperature attack, more existing to be detected judgement by temperature threshold
Mode can not adapt to new attack means, when reaching threshold point, remaining time can not perform effective protection
Measure.
Although new temperature attack, which greatly reduces, implements the time, other attack means are compared, it is still desirable to certain
Time causes temperature to reduce, and simply compared to former temperature attack means, temperature variation increases in the unit interval.Therefore, can be with
Judged by temperature trend, identify that temperature is attacked early, so as to carry out necessary safeguard procedures.
The content of the invention
For overcome the deficiencies in the prior art, it is contemplated that passing through the threshold decision and trend for combining sensor detection results
Judge, propose a kind of advanced method of discrimination of testing result, physical attacks can be quickly recognized, arranged so as to perform protection as early as possible
Apply.The technical solution adopted by the present invention is that, for the advanced method of discrimination of attack detecting sensor threshold value of safety chip, step is such as
Under：
Step S1 is originated for flow, it is necessary to first set three parameters：Upper threshold HV, bottom threshold LV, standard deviation Δ
V；Upper threshold HV is the testing result upper limit, and alarm signal will be produced higher than the threshold value；Bottom threshold LV is testing result lower limit,
Alarm signal will be produced less than the threshold value；Standard deviation Δ V is the permissible maximum difference of testing result twice in succession, continuous two
Secondary testing result difference then thinks that testing result is normal less than Δ V；Enter step S2 in next step；
In step S2, first time detection is first carried out, if this time the result of detection is V0, carries out step S3；
In step S3, detected next time, if this time the result of detection is V1, and make Δ V1=| V1-V0 |, i.e. Δ V1
For V1 and the absolute value of V0 differences, step S4 is carried out；
In step S4, judge whether V1 exceeds threshold value, that is, judge inequality LV<V1<Whether HV sets up, if V1 exceeds threshold
Value, i.e., inequality is invalid, then carries out step S14, produce alarm signal immediately；If V1 is set up without departing from threshold value, i.e. inequality,
Then carry out step S5；
In step S5, judge that Δ V1 whether beyond standard deviation Δ V, that is, judges inequality Δ V1<Whether Δ V sets up,
If inequality is set up, without departing from, it was demonstrated that testing result is normal, carries out step S6；If not, then beyond standard deviation, need
It just can be determined whether under attack, progress step S7 by subsequent detection；
In step S6, V0=V1 is made, i.e., is preserved this testing result, and as the normative reference of next testing result,
Carry out step S3；
In step S7, detected next time, if this time the result of detection is V2, and make Δ V2=| V2-V1 |, i.e. Δ V2
For V2 and the absolute value of V1 differences, step S8 is carried out；
In step S8, judge whether V2 exceeds threshold value, that is, judge inequality LV<V2<Whether HV sets up, if V2 exceeds threshold
Value, i.e., inequality is invalid, then carries out step S14, produce alarm signal immediately；If V2 is set up without departing from threshold value, i.e. inequality,
Then carry out step S9；
In step S9, judge that whether testing result variation tendency is identical three times, that is, judges inequality (V2-V1) * (V1-V0)
>Whether 0 set up, if not, then prove that variation tendency is different, may be subject to external interference to cause testing result ratio occur at this time
Larger deviation, carries out step S6, if so, then prove that variation tendency is identical, it is necessary to do follow-up judgement, carries out step S10；
In step S10, judge that Δ V2 whether beyond standard deviation Δ V, that is, judges inequality Δ V2<Whether Δ V sets up,
If inequality is set up, without departing from, it was demonstrated that this testing result is normal, and there may be extraneous factor interference for last testing result
Cause to malfunction, and carry out step S6；If not, then beyond standard deviation, it is necessary to further be compared, execution step S11；
In step S11, judge that Δ V2 whether beyond the upper difference DELTA V1 detected twice, that is, judges inequality Δ V2<Δ
Whether V1 sets up, if inequality is invalid, exceeds, it was demonstrated that and variation tendency is further severe, it is necessary to produce alarm signal immediately, into
Row step S14；If so, then without departing from, it was demonstrated that variation tendency slows down, but still in abnormality, it is necessary to determine whether, into
Row step S12；
In step S12, judge whether V2 is in danger zone, (HV-LV) is area of feasible solutions, i.e., offline to threshold value by threshold value
The region formed between reaching the standard grade.The region of area of feasible solutions boundary is known as danger zone, and border 0.1* (HV-LV) is known as lower danger
Zone boundary, the region being made of border LV and border 0.1* (HV-LV) are lower danger zone；Border 0.9* (HV-LV) is known as
Upper danger zone border, the region being made of border 0.9* (HV-LV) and border HV is upper danger zone, judges LV<V2<0.1
(HV-LV) or 0.9 (HV-LV)<V2<Whether bis- formulas of HV have an establishment, to be set up if there are an inequality, and V2 is in danger
Region；If V2 is not in danger zone, i.e. two inequality are all invalid, and such a result is in intermediateness, can not be from trend
On draw a conclusion just can determine whether, it is necessary to carry out subsequent detection immediately, carry out step S13, if V2 is in danger zone, i.e., two are not
Equation is one of to be set up, then proves that testing result close to border, it is necessary to produce alarm signal immediately, performs step S14；
In step S13, V1=V2, Δ V1=Δ V2 are made, to preserve this testing result, and as next testing result
Reference, performs step S7.
In step S14, alarm signal is produced, detection terminates.
The features of the present invention and beneficial effect are：
The advanced method of discrimination of sensor detection results proposed by the present invention, can before testing result is not up to threshold value,
Identify physical attacks, reduce physical attacks recognition time, add the pot life that system performs safeguard procedures, enhance
System anti-attack ability.
Brief description of the drawings：
The advanced method of discrimination flow charts of Fig. 1.
The advanced method of discrimination of Fig. 2 differentiates process schematic.
Embodiment
Advanced method of discrimination implementing procedure proposed by the present invention is as shown in Figure 1.Below with reference to Fig. 1, to implementing procedure into
Row describes in detail.
Step S1 is originated for flow, it is necessary to first set three parameters：Upper threshold HV, bottom threshold LV, standard deviation Δ
V.Upper threshold HV is the testing result upper limit, and alarm signal will be produced higher than the threshold value.Bottom threshold LV is testing result lower limit,
Alarm signal will be produced less than the threshold value.Standard deviation Δ V is the permissible maximum difference of testing result twice in succession, continuous two
Secondary testing result difference then thinks that testing result is normal less than Δ V.Enter step S2 in next step.
In step S2, first time detection is first carried out, if this time the result of detection is V0.Carry out step S3.
In step S3, detected next time, if this time the result of detection is V1, and make Δ V1=| V1-V0 |, i.e. Δ V1
For V1 and the absolute value of V0 differences.Carry out step S4.
In step S4, judge whether V1 exceeds threshold value, that is, judge inequality LV<V1<Whether HV sets up.If V1 exceeds threshold
Value, i.e., inequality is invalid, then carries out step S14, produce alarm signal immediately；If V1 is set up without departing from threshold value, i.e. inequality,
Then carry out step S5.
In step S5, judge that Δ V1 whether beyond standard deviation Δ V, that is, judges inequality Δ V1<Whether Δ V sets up.
If inequality is set up, without departing from, it was demonstrated that testing result is normal, carries out step S6；If not, then beyond standard deviation, need
It just can be determined whether under attack, progress step S7 by subsequent detection.
In step S6, V0=V1 is made, i.e., is preserved this testing result, and as the normative reference of next testing result,
Carry out step S3.
In step S7, detected next time, if this time the result of detection is V2, and make Δ V2=| V2-V1 |, i.e. Δ V2
For V2 and the absolute value of V1 differences.Carry out step S8.
In step S8, judge whether V2 exceeds threshold value, that is, judge inequality LV<V2<Whether HV sets up.If V2 exceeds threshold
Value, i.e., inequality is invalid, then carries out step S14, produce alarm signal immediately；If V2 is set up without departing from threshold value, i.e. inequality,
Then carry out step S9.
In step S9, judge that whether testing result variation tendency is identical three times, that is, judges inequality (V2-V1) * (V1-V0)
>Whether 0 set up.If not, then prove that variation tendency is different, may be subject to external interference to cause testing result ratio occur at this time
Larger deviation, carries out step S6.If so, then prove that variation tendency is identical, it is necessary to do follow-up judgement, carries out step S10.
In step S10, judge that Δ V2 whether beyond standard deviation Δ V, that is, judges inequality Δ V2<Whether Δ V sets up.
If inequality is set up, without departing from, it was demonstrated that this testing result is normal, and there may be extraneous factor interference for last testing result
Cause to malfunction, and carry out step S6；If not, then beyond standard deviation, it is necessary to further be compared, execution step S11.
In step S11, judge that Δ V2 whether beyond the upper difference DELTA V1 detected twice, that is, judges inequality Δ V2<Δ
Whether V1 sets up.If inequality is invalid, exceeding, it was demonstrated that variation tendency is further severe, it is necessary to produce alarm signal immediately, into
Row step S14；If so, then without departing from, it was demonstrated that variation tendency slows down, but still in abnormality, it is necessary to determine whether, into
Row step S12.
In step S12, judge whether V2 is in danger zone.(HV-LV) be area of feasible solutions, i.e., it is offline to threshold value by threshold value
The region formed between reaching the standard grade.The region of area of feasible solutions boundary is known as danger zone.Border 0.1* (HV-LV) is known as lower danger
Zone boundary, the region being made of border LV and border 0.1* (HV-LV) are lower danger zone.Border 0.9* (HV-LV) is known as
Upper danger zone border, the region being made of border 0.9* (HV-LV) and border HV are upper danger zone.Judge LV<V2<0.1
(HV-LV) or 0.9 (HV-LV)<V2<Whether bis- formulas of HV have an establishment, to be set up if there are an inequality, and V2 is in danger
Region.If V2 is not in danger zone, i.e. two inequality are all invalid, and such a result is in intermediateness, can not be from trend
On draw a conclusion just can determine whether, it is necessary to carry out subsequent detection immediately, carry out step S13.If V2 is in danger zone, i.e., two are not
Equation is one of to be set up, then proves that testing result close to border, it is necessary to produce alarm signal immediately, performs step S14.
In step S13, V1=V2, Δ V1=Δ V2 are made, to preserve this testing result, and as next testing result
Reference, performs step S7.
In step S14, alarm signal is produced, detection terminates.
As shown in Fig. 2, differentiate process schematic for advanced method of discrimination.Below with reference to the schematic diagram, Fig. 1 is sentenced in advance
Other method flow carries out brief illustration.Because testing result will produce alarm signal immediately beyond threshold value, to simplify table
State, do not include this kind of situation in Fig. 2.
In Fig. 2, reference axis transverse axis represents the time, and the longitudinal axis represents testing result.Each detection time is at intervals of T.If during T
Carve, testing result A, and LV<A<HV.Testing result is normal.2T moment, testing result B, and Δ V>| B-A |, permissible
Fluctuation range in, therefore testing result is also normal.3T moment, testing result may be C1, C2 or C3.ΔV>| C1-B |, can
In the fluctuation range of permission, testing result is normal.ΔV<| C2-B |, testing result occurs abnormal.ΔV<<| C2-B |, detection knot
There is bigger exception in fruit.At the 4T moment, it is detected again.Testing result may be D1, D2, D3, D4 or D5.For D1,
Due to (D1-C2) (C2-B)<0, the i.e. variation tendency of the variation tendency of C2 to D1 and B to C2 are on the contrary, there is outside in estimation herein
Disturbance causes testing result relatively large deviation occur, continues to detect, does not make a decision.For D2, Δ V>| D2-C2 |, admissible
In fluctuation range, testing result is normal.For D4, due to | D4-C2 |>| C2-B |, i.e., variation tendency is more severe, therefore herein
Alarm signal will be produced immediately.For D5, | D5-C3 |<| C3-B |, but D5 is in lower danger zone, therefore will also produce herein
Alarm signal.For D3, | D3-C2 |<| C2-B |, variation tendency has been alleviated, but still in abnormality, it is necessary to carry out again
Detection.At the 5T moment, it is detected again, may has E1, E2, E3, E4 from the testing result of D3 status transitions.E1 variation tendency phases
Instead, in external disturbance state.E2 is in admissible fluctuation range, and testing result is normal.E4 is in variation tendency more
Severe state, need to produce alarm signal immediately.Variation tendency has been alleviated at E3, but still in abnormality, it is necessary to again
Detection, for such a state, system does not make a decision, until it enters other a certain definite states.
Implement according to the advanced method of discrimination flow charts of Fig. 1.Protection scope of the present invention is not limited with the above embodiment,
Those of ordinary skill in the art's equivalent modification that disclosure is made according to the present invention or change, should all include protection domain.
Claims (1)
1. a kind of advanced method of discrimination of attack detecting sensor threshold value for safety chip, it is characterized in that,
Step S1 is originated for flow, it is necessary to first set three parameters：Upper threshold HV, bottom threshold LV, standard deviation Δ V；Threshold
It is the testing result upper limit to be worth upper limit HV, and alarm signal will be produced higher than the threshold value；Bottom threshold LV is testing result lower limit, is less than
The threshold value will produce alarm signal；Standard deviation Δ V is the permissible maximum difference of testing result twice in succession, is examined twice in succession
Survey result difference and then think that testing result is normal less than Δ V；Enter step S2 in next step；
In step S2, first time detection is first carried out, if this time the result of detection is V0, carries out step S3；
In step S3, detected next time, if this time the result of detection is V1, and make Δ V1=| V1-V0 |, i.e. Δ V1 is V1
With the absolute value of V0 differences, step S4 is carried out；
In step S4, judge whether V1 exceeds threshold value, that is, judge inequality LV<V1<Whether HV sets up, if V1 exceeds threshold value, i.e.,
Inequality is invalid, then carries out step S14, produce alarm signal immediately；If V1 without departing from threshold value, i.e., inequality is set up, then into
Row step S5；
In step S5, judge that Δ V1 whether beyond standard deviation Δ V, that is, judges inequality Δ V1<Whether Δ V sets up, if not
Equation is set up, then without departing from, it was demonstrated that testing result is normal, carries out step S6；If not, then beyond standard deviation, it is necessary to through
Cross subsequent detection and just can be determined whether under attack, progress step S7；
In step S6, V0=V1 is made, i.e., is preserved this testing result, and as the normative reference of next testing result, is carried out
Step S3；
In step S7, detected next time, if this time the result of detection is V2, and make Δ V2=| V2-V1 |, i.e. Δ V2 is V2
With the absolute value of V1 differences, step S8 is carried out；
In step S8, judge whether V2 exceeds threshold value, that is, judge inequality LV<V2<Whether HV sets up, if V2 exceeds threshold value, i.e.,
Inequality is invalid, then carries out step S14, produce alarm signal immediately；If V2 without departing from threshold value, i.e., inequality is set up, then into
Row step S9；
In step S9, judge that whether testing result variation tendency is identical three times, that is, judges inequality (V2-V1) * (V1-V0)>0 is
No establishment, if not, then prove that variation tendency is different, external interference may be subject to cause testing result to occur at this time bigger
Deviation, carry out step S6, if so, then prove that variation tendency is identical, it is necessary to do follow-up judgement, carries out step S10；
In step S10, judge that Δ V2 whether beyond standard deviation Δ V, that is, judges inequality Δ V2<Whether Δ V sets up, if not
Equation set up, then without departing from, it was demonstrated that this testing result is normal, last testing result there may be extraneous factor interference to cause
Error, and carry out step S6；If not, then beyond standard deviation, it is necessary to further be compared, execution step S11；
In step S11, judge that Δ V2 whether beyond the upper difference DELTA V1 detected twice, that is, judges inequality Δ V2<Δ V1 is
No establishment, if inequality is invalid, exceeds, it was demonstrated that variation tendency is further severe, it is necessary to produce alarm signal immediately, is walked
Rapid S14；If so, then without departing from, it was demonstrated that variation tendency slows down, but is walked still in abnormality, it is necessary to determine whether
Rapid S12；
In step S12, judge whether V2 is in danger zone, (HV-LV) is area of feasible solutions, i.e., is reached the standard grade by threshold value is offline to threshold value
Between the region that is formed.The region of area of feasible solutions boundary is known as danger zone, and border 0.1* (HV-LV) is known as lower danger zone
Border, the region being made of border LV and border 0.1* (HV-LV) are lower danger zone；Border 0.9* (HV-LV) is known as upper danger
Dangerous zone boundary, the region being made of border 0.9* (HV-LV) and border HV is upper danger zone, judges LV<V2<0.1(HV-
) or 0.9 (HV-LV) LV<V2<Whether bis- formulas of HV have an establishment, to be set up if there are an inequality, and V2 is in hazardous area
Domain；If V2 is not in danger zone, i.e. two inequality are all invalid, and such a result is in intermediateness, can not be from trend
Draw a conclusion and just can determine whether, it is necessary to carry out subsequent detection immediately, carry out step S13, if V2 is in danger zone, i.e., two are differed
Formula is one of to be set up, then proves that testing result close to border, it is necessary to produce alarm signal immediately, performs step S14；
In step S13, V1=V2, Δ V1=Δ V2 are made, to preserve this testing result, and as the ginseng of next testing result
According to execution step S7；
In step S14, alarm signal is produced, detection terminates.
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| CN201711030869.0A CN107907821B (en) | 2017-10-28 | 2017-10-28 | Attack detection sensor threshold advanced discrimination method for security chip |
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