CN102156828A - Check method in process of data access of smart card and smart card - Google Patents
Check method in process of data access of smart card and smart card Download PDFInfo
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- CN102156828A CN102156828A CN2011100269334A CN201110026933A CN102156828A CN 102156828 A CN102156828 A CN 102156828A CN 2011100269334 A CN2011100269334 A CN 2011100269334A CN 201110026933 A CN201110026933 A CN 201110026933A CN 102156828 A CN102156828 A CN 102156828A
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Abstract
The embodiment of the invention provides a check method in the process of data access of a smart card and the smart card and relates to the field of the smart card, which can prevent the problem of data distortion or data invalidation in the process of data access in a non-volatile memory. The method comprises the following steps of: carrying out check calculation on first data to be memorized in the non-volatile memory to obtain a first check value; memorizing the first data and the first check value into the non-volatile memory; and reading the first data and the first check value from the non-volatile memory, and determining whether the first data is legal according to the check method, the first data and the first check value. The embodiment of the invention is applied to the smart card.
Description
Technical field
The present invention relates to field of intelligent cards, relate in particular to a kind of intelligent card data and deposit, withdraw method of calibration and smart card in the process.
Background technology
At present, the protection of intelligent card data integrality and checking are mainly concentrated on card outward in the data communication process of entity and card, i.e. route protection.In communication process, block outer entity with a good data computation MAC (Message Authentication Code) value of key of communicating pair as offered, then data itself and MAC value are passed to card by the command format of APDU (Application Protocol Data Unit) together transmitting.Card carries out MAC with same key to data and calculates after finishing receiving, and the MAC value with the outer entity calculating of card compares afterwards, if it is consistent, prove that then data are not distorted in transmittance process, otherwise think that data are distorted that the return data status word error gives card outer entity.
The prior art standards and norms have guaranteed the integrality of data in transmission course, can prevent to be distorted on the online data road.Card after receiving data, can be at first with data storage in volatile memory (for example RAM), so that computing and checking, and then with in the data write non-volatile memory (for example EEPROM); When following secondary program is used these data, can directly from nonvolatile memory, read these data in volatile memory, claim that herein aforementioned process is the process that deposits, withdraws data in the nonvolatile memory.
The inventor finds: data are writing in nonvolatile memory, or from nonvolatile memory in the process of reading, if distorted or lost efficacy because of certain ignorance factor causes data, then can't guarantee the authenticity and the validity of data, nonvolatile memory deposits, withdraws in the process like this, the just possible distortion or invalid of data, the data that read just may be illegal data, use invalid data to give and use the card user or the card issuer of these data to bring risk, cause the loss in the use.
Summary of the invention
The embodiment of the invention provides a kind of intelligent card data to deposit, withdraw method of calibration and smart card in the process, can prevent to deposit, withdraw in the nonvolatile memory in the data procedures data distortion or invalid problem.
For achieving the above object, embodiments of the invention adopt following technical scheme:
A kind of intelligent card data deposits, withdraws the method for calibration in the process, comprising:
First data that will store in the nonvolatile memory are carried out verification calculating, obtain first proof test value;
Described first data and first proof test value are stored in the described nonvolatile memory;
Read out described first data and first proof test value from described nonvolatile memory, according to described method of calibration, and described first data, first proof test value determine whether these first data are legal.
A kind of smart card comprises:
Verification unit is used for that first data that will store nonvolatile memory into are carried out verification and calculates, and obtains first proof test value;
Storage unit is used for storing described first data and first proof test value into described nonvolatile memory;
Reading unit is used for reading out described first data and first proof test value from described nonvolatile memory;
Judging unit is used for according to described method of calibration, and described first data, first proof test value determine whether these first data are legal.
The intelligent card data that the embodiment of the invention provides deposits, withdraws method of calibration and the smart card in the process, and the data that store in the nonvolatile memory are carried out verification calculating, obtains proof test value; These data and proof test value are stored in the nonvolatile memory; From nonvolatile memory, read out these data and proof test value, determine according to above-mentioned method of calibration, data, proof test value whether these data are legal.Like this, by increasing deposit, withdraw the verification in process of data to nonvolatile memory, effectively reduce the possibility that from nonvolatile memory, reads invalid data, thereby guaranteed the validity and the authenticity of the data that read, prevented that factor is according to the loss in the illegal user's use that causes.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The intelligent card data that Fig. 1 provides for the embodiment of the invention deposits, withdraws the FB(flow block) of the method for calibration in the process;
The intelligent card data that Fig. 2 provides for another embodiment of the present invention deposits, withdraws the FB(flow block) of the method for calibration in the process;
The intelligent card data that Fig. 3 provides for further embodiment of this invention deposits, withdraws the FB(flow block) of the method for calibration in the process;
The structured flowchart of the smart card that Fig. 4 provides for the embodiment of the invention;
Another structured flowchart of the smart card that Fig. 5 provides for the embodiment of the invention;
The another structured flowchart of the smart card that Fig. 6 provides for the embodiment of the invention;
A structured flowchart again of the smart card that Fig. 7 provides for the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
The intelligent card data that the embodiment of the invention provides deposits, withdraws the method for calibration in the process, and as shown in Figure 1, this method step comprises:
S101, carry out verification and calculate, obtain first proof test value storing first data in the nonvolatile memory into.
Concrete, this step can be undertaken by the outer entity of card, and promptly the outer entity of card carries out calculating through verification to first data that will store in the smart card nonvolatile memory, obtains first proof test value, again these first data and first proof test value is sent to smart card.Also can be undertaken, after smart card this moment entity outside blocking receives first data that will store into the nonvolatile memory, these first data are carried out verification calculate, obtain first proof test value by the CPU in the card.
Concrete method of calibration, the embodiment of the invention does not limit, any existing method of calibration that can be used for smart card all can, can freely select according to safe class.For example exclusive or check, cyclic redundancy check etc., or these data are carried out MAC calculating at key of card stored (key that this key can be with data uses during in the inside and outside transmission of card is relevant, also can be uncorrelated), obtain proof test value or the like.
S102, first data and first proof test value are stored in the nonvolatile memory.
S103, read out first data and first proof test value from nonvolatile memory, according to method of calibration, and first data, first proof test value determine whether these first data are legal.
Concrete, for determine that first data book that reads is illegal from nonvolatile memory, two kinds of judgment modes can be arranged:
A kind ofly be, utilize method of calibration that above-mentioned steps S101 adopts, obtain second proof test value first data that from nonvolatile memory, the read calculating of testing.If this second proof test value equates with first proof test value that reads, determine that then these first data are legal from nonvolatile memory.
Another kind is, utilizes the conversion check method of the method for calibration that above-mentioned steps S101 adopts that first proof test value that reads from nonvolatile memory is carried out conversion check and calculates, and obtains second data.If these second data equate with first data that read, determine that then these first data are legal from nonvolatile memory.
Certainly, just for example, the embodiment of the invention is not limited to this to the used above-mentioned determination methods of the embodiment of the invention, and whether legal other the judgment data of utilizing data and proof test value method also passable.
The intelligent card data that the embodiment of the invention provides deposits, withdraws the method for calibration in the process, and the data that store in the nonvolatile memory are carried out verification calculating, obtains proof test value; These data and proof test value are stored in the nonvolatile memory; From nonvolatile memory, read out these data and proof test value, determine according to above-mentioned method of calibration, data, proof test value whether these data are legal.Like this, by increasing deposit, withdraw the verification in process of data to nonvolatile memory, effectively reduce the possibility that from nonvolatile memory, reads invalid data, thereby guaranteed the validity and the authenticity of the data that read, prevented that factor is according to the loss in the illegal user's use that causes.
The intelligent card data that another embodiment of the present invention provides deposits, withdraws the method for calibration in the process, nonvolatile memory is an example with EEPROM (EEPROM (Electrically Erasable Programmable Read Only Memo)), the main body hypothesis of carrying out the verification computing is the CPU of smart card, and the method for calibration that is adopted is calculated for carry out MAC with key.Its method step comprises as shown in Figure 2:
The outer entity of S201, smart card receiving card sends will store first data in the smart card nonvolatile memory into.
The CPU of S202, smart card utilizes the key of card stored, these first data is carried out MAC calculate, and obtains first proof test value.
S203, smart card deposit these first data and first proof test value among the EEPROM in.
S204, smart card read these first data and first proof test value from EEPROM.
The CPU of S205, smart card utilizes the key of above-mentioned card stored that these first data are carried out calculating as the MAC of step S202 once more, obtains second proof test value.
S206, smart card judge whether second proof test value and first proof test value equate, if the two equates then execution in step S207, if the two unequal then execution in step S208.
S207, smart card continue follow-up processing flow.
S208, smart card repeat to read, whether specified data is legal, and judge whether the number of times that repeats has reached default higher limit.If do not reach, execution in step S204 then, if reach, execution in step S209 then.
At this, can set in advance the higher limit of a multiplicity.By this limited number of time repeat judge, both can prevent a misjudgment of the data legitimacy that causes because of accidental factor, also can save the processing time of smart card by limited number of times.
S209, smart card abort process flow process are returned error condition and are given card outer entity.
The intelligent card data that the embodiment of the invention provides deposits, withdraws the method for calibration in the process, utilizes the own key of smart card to carry out MAC calculating to first data that will store among the EEPROM, obtains first proof test value; These first data and first proof test value are stored among the EEPROM; From EEPROM, read out these first data and first proof test value, utilize own key that these first data are carried out MAC once more and calculate, obtain second proof test value; If second proof test value equates with first proof test value, determine that then these data are legal.Like this, by increasing deposit, withdraw the verification in process of data to EEPROM, effectively reduce from EEPROM, read invalid data may, thereby guaranteed the validity and the authenticity of the data that read, prevented that factor is according to the loss in the illegal user's use that causes.
The intelligent card data that further embodiment of this invention provides deposits, withdraws the method for calibration in the process, nonvolatile memory is an example with EEPROM (EEPROM (Electrically Erasable Programmable Read Only Memo)), the main body hypothesis of carrying out the verification computing is the CPU of smart card, and the method for calibration that is adopted is calculated for carry out MAC with key.Its method step comprises as shown in Figure 3:
The outer entity of S301, smart card receiving card sends will store first data in the smart card nonvolatile memory into.
The CPU of S302, smart card utilizes the key of card stored, these first data is carried out MAC calculate, and obtains first proof test value.
S303, smart card deposit these first data and first proof test value among the EEPROM in.
S304, smart card read these first data and first proof test value from EEPROM.
The CPU of S305, smart card utilizes the key of above-mentioned card stored, and the conversion check method of calculating with the MAC of step S302 is carried out conversion check to first proof test value and calculated, and obtains second data.
S306, smart card judge whether second data and first data equate, if the two equates then execution in step S307, if the two unequal then execution in step S308.
S307, smart card continue follow-up processing flow.
S308, smart card repeat to read, whether specified data is legal, and judge whether the number of times that repeats has reached default higher limit.If do not reach, execution in step S304 then, if reach, execution in step S309 then.
At this, can set in advance the higher limit of a multiplicity.By this limited number of time repeat judge, both can prevent a misjudgment of the data legitimacy that causes because of accidental factor, also can save the processing time of smart card by limited number of times.
S309, smart card abort process flow process are returned error condition and are given card outer entity.
The intelligent card data that the embodiment of the invention provides deposits, withdraws the method for calibration in the process, utilizes the own key of smart card to carry out MAC calculating to first data that will store among the EEPROM, obtains first proof test value; These first data and first proof test value are stored among the EEPROM; From EEPROM, read out these first data and first proof test value, utilize own key that this first proof test value is carried out the conversion check calculating that MAC calculates, obtain second data; If second data equate with first data, determine that then these data are legal.Like this, by increasing deposit, withdraw the verification in process of data to EEPROM, effectively reduce from EEPROM, read invalid data may, thereby guaranteed the validity and the authenticity of the data that read, prevented that factor is according to the loss in the illegal user's use that causes.
Certainly, just for example, the embodiment of the invention is not limited to this to the method for calibration that present embodiment adopted, and other any smart cards are applicable to utilize the judgement of data and proof test value all can.
The smart card 40 that the embodiment of the invention provides, as shown in Figure 4, this smart card comprises:
At this, the concrete method of calibration embodiment of the invention does not limit, any existing method of calibration that can be used for smart card all can, can freely select according to safe class.For example exclusive or check, cyclic redundancy check etc., or these data are carried out MAC calculating at key of card stored (key that this key can be with data uses during in the inside and outside transmission of card is relevant, also can be uncorrelated), obtain proof test value or the like.
Reading unit 403 is used for reading out these first data and first proof test value from nonvolatile memory.
Judging unit 404 is used for according to above-mentioned method of calibration, and first data, first proof test value determine whether these first data are legal.
The smart card that the embodiment of the invention provides carries out verification calculating to the data that will store in the nonvolatile memory, obtains proof test value; These data and proof test value are stored in the nonvolatile memory; From nonvolatile memory, read out these data and proof test value, determine according to above-mentioned method of calibration, data, proof test value whether these data are legal.Like this, by increasing deposit, withdraw the verification in process of data to nonvolatile memory, effectively reduce the possibility that from nonvolatile memory, reads invalid data, thereby guaranteed the validity and the authenticity of the data that read, prevented that factor is according to the loss in the illegal user's use that causes.
Further, as shown in Figure 5, this smart card 40 also comprises:
Judging unit 404 is used for according to above-mentioned method of calibration, and first data, first proof test value determine whether these first data are legal, if multiplicity reaches default higher limit and determines that still these first data are illegal, then stop subsequent treatment.
At this, can set in advance the higher limit of a multiplicity.By this limited number of time repeat judge, both can prevent a misjudgment of the data legitimacy that causes because of accidental factor, also can save the processing time of smart card by limited number of times.
As shown in Figure 6, this judging unit 404 comprises:
Verification module 4041, the method for calibration when being used to utilize verification obtains second proof test value to the calculating of testing of first data.
Comparing module 4042 is used to compare this second proof test value and first proof test value, if second proof test value equates that with described first proof test value then definite these first data are legal.
Perhaps, as shown in Figure 7, this judging unit 404 comprises:
Conversion check module 4041 ', the conversion check method of the method for calibration when being used to utilize verification is carried out conversion check calculating to first proof test value, obtains second data.
Comparing module 4042 is used to compare these second data and first data, if second data equate that with first data then definite these first data are legal.
The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (10)
1. an intelligent card data deposits, withdraws the method for calibration in the process, it is characterized in that, comprising:
First data that will store in the nonvolatile memory are carried out verification calculating, obtain first proof test value;
Described first data and first proof test value are stored in the described nonvolatile memory;
Read out described first data and first proof test value from described nonvolatile memory, according to described method of calibration, and described first data, first proof test value determine whether these first data are legal.
2. method according to claim 1 is characterized in that, first data that store in the nonvolatile memory are carried out verification calculating, obtains first proof test value and comprises:
Block outer entity first data that will store in the smart card nonvolatile memory are carried out verification calculating, obtain first proof test value, and described first data and first proof test value are sent to smart card.
3. method according to claim 1 is characterized in that, first data that store in the nonvolatile memory are carried out verification calculating, obtains first proof test value and comprises:
After smart card entity outside blocking receives first data that will store into the nonvolatile memory, described first data are carried out verification calculate, obtain first proof test value.
4. according to the arbitrary described method of claim 1-3, it is characterized in that, read out described first data and first proof test value from described nonvolatile memory, according to described verification computing method, and described first data, first proof test value are determined this first data legal comprising whether:
From described nonvolatile memory, read out described first data and first proof test value;
Utilize described method of calibration to the calculating of testing of described first data, obtain second proof test value;
If described second proof test value equates with described first proof test value, determine that then these first data are legal.
5. according to the arbitrary described method of claim 1-3, it is characterized in that, read out described first data and first proof test value from described nonvolatile memory, according to described verification computing method, and described first data, first proof test value are determined this first data legal comprising whether:
From described nonvolatile memory, read out described first data and first proof test value;
Utilize the conversion check method of described method of calibration that described first proof test value is carried out conversion check calculating, obtain second data;
If described second data equate with described first data, determine that then these first data are legal.
6. method according to claim 1, it is characterized in that, described method also comprises: if determine that described first data are illegal, then repeat from described nonvolatile memory, to read described first data and first proof test value and determine whether described first data are legal, if multiplicity reaches default higher limit and determines that still described first data are illegal, then stop subsequent treatment.
7. a smart card is characterized in that, comprising:
Verification unit is used for that first data that will store nonvolatile memory into are carried out verification and calculates, and obtains first proof test value;
Storage unit is used for storing described first data and first proof test value into described nonvolatile memory;
Reading unit is used for reading out described first data and first proof test value from described nonvolatile memory;
Judging unit is used for according to described method of calibration, and described first data, first proof test value determine whether these first data are legal.
8. smart card according to claim 7 is characterized in that, described smart card also comprises:
Repeat reading unit, be used for then repeating from described nonvolatile memory, to read described first data and first proof test value if determine that described first data are illegal;
Described judging unit is used for according to described method of calibration, and described first data, first proof test value determine whether these first data are legal, if multiplicity reaches default higher limit and determines that still described first data are illegal, then stop subsequent treatment.
9. according to claim 7 or 8 described smart cards, it is characterized in that described judging unit comprises:
The verification module is used to utilize described method of calibration to the calculating of testing of described first data, obtains second proof test value;
Comparing module is used to compare described second proof test value and described first proof test value, if described second proof test value equates that with described first proof test value then definite these first data are legal.
10. according to claim 7 or 8 described smart cards, it is characterized in that described judging unit comprises:
The conversion check module is used to utilize the conversion check method of described method of calibration that described first proof test value is carried out conversion check calculating, obtains second data;
Comparing module is used to compare described second data and described first data, if described second data equate that with described first data then definite these first data are legal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100269334A CN102156828A (en) | 2011-01-25 | 2011-01-25 | Check method in process of data access of smart card and smart card |
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| CN2011100269334A CN102156828A (en) | 2011-01-25 | 2011-01-25 | Check method in process of data access of smart card and smart card |
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| CN107453873A (en) * | 2017-07-21 | 2017-12-08 | 金邦达有限公司 | A kind of intellective IC card data verification method and system |
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| CN110276213A (en) * | 2019-06-24 | 2019-09-24 | 恒宝股份有限公司 | The storage and method of calibration of a kind of smart card and its sensitive result |
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Application publication date: 20110817 |