CN102833072A - Dynamic generation method for access key of automobile electronic information card - Google Patents
Dynamic generation method for access key of automobile electronic information card Download PDFInfo
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- CN102833072A CN102833072A CN2012103124810A CN201210312481A CN102833072A CN 102833072 A CN102833072 A CN 102833072A CN 2012103124810 A CN2012103124810 A CN 2012103124810A CN 201210312481 A CN201210312481 A CN 201210312481A CN 102833072 A CN102833072 A CN 102833072A
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- access key
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- vehicle electric
- electric release
- key
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Abstract
The invention discloses a dynamic generation method for an access key of an automobile electronic information card. The automobile electronic information card comprises a Reserved data storage area, an EPC (electronic product code) data storage area, a TID (terminal identification) storage area and a USER storage area. Based on RFID (radio frequency identification) technology, initialization is realized, the access key and an EPC random code are generated dynamically, and access key updates are accessed. The method includes the steps: initializing the automobile electronic information card, dynamically generating the access key of the automobile electronic information card, and updating the access key. Compared with the prior art, the access key of the automobile electronic information card is simple in structure, scientific and reasonable in design and low in manufacturing cost, doesn't need to be stored in a reader, an acquisition device or a data center, and accordingly security of data in the automobile electronic information card is improved, read-write speed and efficiency of the reader are improved, dynamics of access key generation is achieved, and a safe and reliable dynamic generation system for the access key of the automobile electronic information card is provided.
Description
Technical field
The present invention relates to information encryption, particularly relate to a kind of generation method of electronic information card access key.
Background technology
The vehicle electric release is stored in the digital information of relevant testing vehicle register wherein; Be fixedly mounted on during use on the vehicle front windshield; So, the information that is stored in the vehicle electric release just can directly be read by reader, so identification certainty that should technology is higher.But the data in the vehicle electric release will be caused immeasurable loss to the information security of vehicle if read easily and illegally utilize.
The access key of vehicle electric release can carry out read protection to the data in the vehicle electric release in the prior art, is illegally utilized significant for the information in the vehicle electric release that prevents by other people.
The vehicle electric release comprises Reserved, EPC, TID and four data memory blocks of USER:
Memory access password in the Reserved district (Access Password) and kill password (Kill Password); The EPC district is at first external area exposed, and any reader or collecting device all can arbitrarily read; The TID district is when dispatching from the factory, by the unified unique coding set of producer; The USER district is used for storing the information relevant with system requirements.Do not obtaining under the situation of correct access key, reader or collecting device can not be read the data in Reserved district and the USER district, and EPC district and TID district can arbitrarily be read.
At present; Read protection for data in the vehicle electric release; Mainly be based on the characteristics of Gen2 agreement and the characteristic of current vehicle electronic information card; Its concrete operations mode is: earlier the all-access key list is stored in the PSAM card of reader, utilizes part or all of data conduct in the EPC district to obtain the index of access key, when the vehicle electric release is read; According to the access key index that is stored in the EPC district, obtain corresponding access key in the PSAM card from be inserted in reader; Also can the all-access key list be stored in data center, the access key index according to being stored in the EPC district obtains access key from data center.
More than the vehicle electric release is carried out read-protected mode; Effectively utilized and at first read the EPC district; Utilize the EPC district as the index that obtains access key, need access key be stored in PSAM card or data center, ensured the fail safe of access key to a certain extent.
But in the application of reality, if access key is stored in PSAM (terminal security control module) card of reader, in case the PSAM card that is inserted on the reader is stolen, information will be unsafe; When reading the information in the vehicle electric release at every turn, must be from the PSAM card retrieval access key, it is longer relatively to expend time in, and can not support the practical application request that the speed of a motor vehicle is higher, vehicle is parallel effectively; When access key is upgraded, need the access key in each reader PSAM card be upgraded, the unified difficulty of upgrading is bigger in the applied environment of reality.The technological deficiency that these exist with the immediate prior art of the present invention just.
Summary of the invention
Problem based on above-mentioned prior art existence; The present invention proposes a kind of vehicle electric release access key dynamic creation method; Based on the RFID REID, realize that initialization, the access key of vehicle electric release dynamically generates and access key renewal three application greatly.
1. the present invention proposes a kind of vehicle electric release access key dynamic creation method; Said vehicle electric release comprises Reserved, EPC, TID and four data memory blocks of USER; And based on the RFID REID; Realize initialization, access key dynamically generates and access key upgrades, and it is characterized in that this method may further comprise the steps:
The key seed formula is:
Wherein: definition n=pq, p, q are two big prime numbers that satisfy p ≡ q ≡ 3mod4, n is the Blum integer, s
-1Be random integers coprime of selecting with n;
Step 2, dynamically generate vehicle electric release access key and EPC random code: access application is checked the vehicle electric release and is obtained EPC district stored information from the vehicle electric release; Verify the identity of vehicle electric release based on the finger print information of EPC district storage; If meet the requirements then obtain access limit to the vehicle electric release; Call the access key generating algorithm, dynamically generate access key based on the key seed and the version number that are stored in the EPC district;
The access key formula is:
f(s
0)=(z
1,z
2,…,z
l)
Wherein
z
i=s
imod?2
L is the figure place of access key, s
iBe the number of the i position of access key, through z
i=s
iBehind the mod2, z
iBe the number of the i position of access key (this moment z
iValue be 0 or 1), the access key f (s of generation
0)=(z
1, z
2..., z
l) be 0, the 1bit string; s
0It is the seed of the front access key of calculating;
Difference (being prime pair p, the difference of choosing of q) according to selected n is distinguished different versions, the n that promptly different version numbers is corresponding different;
EPC random code computing formula is:
With key seed s
0As seed, utilize formula
s
i+1=(a×s
i+b)modn 0≤i≤l-1
Wherein, n, a, b are integer;
Generate the EPC random code
g(s
0)=(z
1,z
2,…,z
l)
L is the figure place of EPC random code, s
iBe the number of the i position of EPC random code, z
iNumber for the i position of EPC random code;
z
i=s
imod?2，
The EPC random code g (s that generates
0)=(z
1, z
2..., z
l) be 0, the 1bit string;
Step 3, renewal access key: at first generate access key, obtain access limit to the vehicle electric release according to the former EPC of vehicle electric release district data; Secondly, the dynamic generating algorithm of vehicle electric release access key regenerates new EPC district data and access key; At last, newly-generated EPC district data and access key are write the vehicle electric release, accomplish renewal vehicle electric release access key.
The step of said initialization vehicle electric release only needs when vehicle electric release primary offering, to carry out once.
Stored information comprises version number, key seed, fingerprint and random code in the said EPC district, accounts for 8bit respectively, 32bit, 24bit and 32bit.
Said fingerprint is used for verifying whether the vehicle electric release is that native system is issued.
This method is when only need changing the access key of vehicle electric release; Call the key seed generating algorithm and make the data of the key seed information block in the EPC district demonstrate randomized state, make the key seed generating algorithm have the version number identical with the access key generating algorithm.
The data of the key seed information block in said EPC district are upgraded at random, and realization is to the access key generating algorithm and rewrite dynamically updating of EPC code calculation at random.
Compared with prior art; The present invention is simple in structure, design science is reasonable, cost of manufacture is lower; The access key of vehicle electric release need not be stored in reader, collecting device or data center, has improved safety of data in the vehicle electric release, has promoted the read or write speed and the efficient of reader; Having realized the dynamic that access key generates, is a kind of safe and reliable vehicle electric release access key dynamic generating system.
Description of drawings
Fig. 1 is vehicle electric release EPC district store data structure figure of the present invention;
Fig. 2 is a vehicle electric release initialization flowchart of the present invention;
Fig. 3 is vehicle electric release browsing process figure of the present invention;
Fig. 4 is a vehicle electric release initialization flow process sequential chart of the present invention;
Fig. 5 is a vehicle electric release browsing process sequential chart of the present invention
Embodiment
Through specific embodiment and accompanying drawing the present invention is made further detailed description below, following examples are descriptive, are not determinate, can not limit protection scope of the present invention with this.
Vehicle electric release access key dynamic creation method of the present invention is made up of three main core algorithms, is respectively key seed generating algorithm, access key generating algorithm and EPC sign indicating number random algorithm.
The key seed generating algorithm
If p, q are two big prime numbers that satisfy p ≡ q ≡ 3mod4, definition n=pq, n is the Blum integer.The set of the quadratic residue of QR (n) expression mould n, that is, QR (n)={ x
2Modn:x and n are coprime }.Alternative is selected a random integers s coprime with n
-1, choose the qualified current time (a millisecond value that level is big).Calculate the seed of access key:
This has guaranteed s
0∈ QR (n).
The access key generating algorithm
Definition:
Generate access key
f(s
0)=(z
1,z
2,…,z
l)
L is the figure place (when for example access key accounted for 32, l just was 32) of access key, s
iBe the number of the i position of access key, through z
i=s
iBehind the mod 2, z
iBe the number of the i position of access key (this moment z
iValue be 0 or 1), so the access key f (s that generates
0)=(z
1, z
2..., z
l) be 0, the 1bit string; s
0It is the seed of the front access key of calculating.
Wherein
z
i=s
imod?2
Difference (being prime pair p, the difference of choosing of q) according to selected n is distinguished different versions, and the n that promptly different version number is corresponding different is equivalent to maintaining secrecy to selected Blum Integer n for algorithm secret.
EPC sign indicating number random algorithm
With key seed s
0As seed, utilize formula
s
i+1=(a×s
i+b)modn 0≤i≤l-1
Wherein, n, a, b are integer;
Generating the EPC random code does
g(s
0)=(z
1,z
2,…,z
l)
L is the figure place of visit EPC random code, s
iBe the number of the i position of EPC random code, through z
i=s
iBehind the mod2, z
iBe the number of the i position of EPC random code (this moment z
iValue be 0 or 1)
So EPC random code g (s that generates
0)=(z
1, z
2..., z
l) be 0, the 1bit string.
In the EPC district store data structure sketch map as shown in Figure 1, storage version number, key seed, fingerprint and random code account for 8bit respectively, 32bit, 24bit and 32bit in the EPC district of vehicle electric release.
The flow process of initialization vehicle electric release as shown in Figure 2, the operation that this carries out when being vehicle electric release primary offering.Specifically may further comprise the steps:
Step 2, call the key seed generating algorithm according to version number and generate key seed.
Step 3, basis are rewritten the EPC code calculation at random, obtain the EPC random code.
Step 4, version number, key seed, fingerprint and EPC random code are write the EPC district.
Step 5, call the access key generating algorithm according to version number and combine key seed to generate access key.
Step 6, the vehicle classified information is write the USER district.
Step 7, access key is write the Reserved district of vehicle electric release, locking vehicle electric release is accomplished initialization operation.
As shown in Figure 3, through in the reader collection vehicle electronic information card of road surface during information, the flow process according to the key seed in the EPC district and version number generate access key may further comprise the steps:
Step 2, obtain fingerprint according to EPC district information;
Step 3, if the fingerprint matching requirement, according to EPC district information through built-in access key generating algorithm generation access key;
Step 4, reader load access key and read USER district data;
Step 5, obtain success, gather USER district data;
Step 6, USER district storage regularly or is in real time uploaded in reader.
Practical implementation process of the present invention is described below according to sequential:
As shown in Figure 4 and Figure 5, the operation of successively accomplishing according to sequential for vehicle electric release initialization flow process and browsing process.
As shown in Figure 4; Utilize the operation that comprises in regular turn between initialization application program and the access key generation system to have in the initialization vehicle electric release flow process: the initialization application program is sent the initialization operation instruction to the access key generation system, and the operation of being undertaken by the access key generation system comprises: generate the key seed data in pseudo random number → generation version number and the key seed → generation access code → generation EPC district; Afterwards, EPC and access code are write the information of vehicles card, return the write operation end value, realize that promptly the initialization result value returns.
In the initialized process of vehicle electric release; Access key is dynamically generated by algorithm; The initialization application program can write the vehicle electric release with the access key that dynamically generates, and in EPC first blocks of data version of correct write-access key schedule.
As shown in Figure 5; The operation that comprises in regular turn between access application and access key generation system and the vehicle electric release in the vehicle electric release browsing process has: access application is checked vehicle electric release → return the EPC information of effective vehicle electronic information card → call the access key generating algorithm by access application from the vehicle electric release, generates access key → to access application backward reference key → by access application vehicle electric release → return vehicle electric release data.
For the road surface fixed reader, correctly read the information of carrying in the vehicle electric release, just must know access key.Because multiple access key generating algorithm can be stored in reader inside; Obtain the EPC district data of vehicle electric release when reader after; Call correct access key generating algorithm, the access key that generation visit vehicle electric release needs according to behind the version that wherein obtains the access key generating algorithm number.Illegal reader can not carry out read-write operation to the data in the vehicle electric release when not obtaining access key.
The access key generating algorithm, the partial data (block of key seed information) that can use the EPC district is as seed.In order to prevent that the EPC data from being utilized as unique identification by other people, have in reader inside and rewrite the algorithm of EPC data at random.So, possess at reader under the prerequisite of the ability that application program module upgrades, the manager of system can realize the access key generating algorithm and rewrite dynamically updating of EPC code calculation at random.
When initialization vehicle electric release perhaps has the demand of the access key of only changing the vehicle electric release; Need a key seed generating algorithm to make the information of some block in EPC district demonstrate randomized state; Especially those are as the block of key seed information, and the access key randomness that generates like this is stronger.The key seed generating algorithm should have the version number identical with the access key generating algorithm.
If when needing to upgrade access key, at first, generate access key according to the former EPC of vehicle electric release district data, obtain access limit to the vehicle electric release; Secondly, the dynamic generating algorithm of vehicle electric release access key regenerates new EPC district data and access key; At last, newly-generated EPC district data and access key are write the vehicle electric release, accomplish renewal vehicle electric release access key.
Claims (6)
1. vehicle electric release access key dynamic creation method; Said vehicle electric release comprises Reserved, EPC, TID and four data memory blocks of USER; And based on the RFID REID; Realize initialization, access key dynamically generates and access key upgrades, and it is characterized in that this method may further comprise the steps:
Step 1, initialization vehicle electric release: the initialization application program is sent the initialization operation instruction to the access key generation system; Produce version number according to random time; Call the key seed algorithm again; Generate key seed and EPC random code according to version number, and version number, key seed, fingerprint and EPC random code are write the EPC district, at last the access key that generates is write the Reserved district;
The key seed computing formula is:
Wherein: definition n=pq, p, q are two big prime numbers that satisfy p ≡ q ≡ 3mod4, n is the Blum integer, s
-1Be random integers coprime of selecting with n;
Step 2, dynamically generate vehicle electric release access key and EPC random code: access application is checked the vehicle electric release and is obtained EPC district stored information from the vehicle electric release; Verify the identity of vehicle electric release based on the finger print information of EPC district storage; If meet the requirements then obtain access limit to the vehicle electric release; Call the access key generating algorithm, dynamically generate access key based on the key seed and the version number that are stored in the EPC district;
The access key computing formula is:
f(s
0)=(z
1,z
2,…,z
l)
Wherein
z
i=s
imod?2
L is the figure place of access key, S
iBe the number of the i position of access key, through z
i=s
iBehind the mod2, z
iBe the number of the i position of access key (this moment z
iValue be 0 or 1), the access key f (s of generation
0)=(z
1, z
2..., z
l) be 0, the 1bit string; s
0It is the seed of the front access key of calculating;
Difference (being prime pair p, the difference of choosing of q) according to selected n is distinguished different versions, the n that promptly different version numbers is corresponding different;
EPC random code computing formula is:
With key seed s
0As seed, utilize formula
s
i+1=(a×s
i+b)modn 0≤i≤l-1
Wherein, n, a, b are integer;
Generate the EPC random code
g(s
0)=(z
1,z
2,…,z
l)
L is the figure place of visit EPC random code, s
iBe the number of the i position of EPC random code, z
iNumber for the i position of EPC random code;
z
i=s
imod?2，
The EPC random code g (s that generates
0)=(z
1, z
2..., z
l) be 0, the 1bit string;
Step 3, renewal access key: at first generate access key, obtain access limit to the vehicle electric release according to the former EPC of vehicle electric release district data; Secondly, the dynamic generating algorithm of vehicle electric release access key regenerates new EPC district data and access key; At last, newly-generated EPC district data and access key are write the vehicle electric release, accomplish renewal vehicle electric release access key.
2. vehicle electric release access key dynamic creation method as claimed in claim 1 is characterized in that, the step of said initialization vehicle electric release only needs when vehicle electric release primary offering, to carry out once.
3. vehicle electric release access key dynamic creation method as claimed in claim 1 is characterized in that stored information comprises version number, key seed, fingerprint and random code in the said EPC district, accounts for 8bit respectively, 32bit, 24bit and 32bit.
4. vehicle electric release access key dynamic creation method as claimed in claim 3 is characterized in that, said fingerprint is used for verifying whether the vehicle electric release is that native system is issued.
5. vehicle electric release access key dynamic creation method as claimed in claim 1; It is characterized in that; When only need change the access key of vehicle electric release; Call the key seed generating algorithm and make the data of the key seed information block in the EPC district demonstrate randomized state, make the key seed generating algorithm have the version number identical with the access key generating algorithm.
6. vehicle electric release access key dynamic creation method as claimed in claim 5; It is characterized in that; The data of the key seed information block in said EPC district are upgraded at random, and realization is to the access key generating algorithm and rewrite dynamically updating of EPC code calculation at random.
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| CN2012103124810A CN102833072A (en) | 2012-08-29 | 2012-08-29 | Dynamic generation method for access key of automobile electronic information card |
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| CN2012103124810A CN102833072A (en) | 2012-08-29 | 2012-08-29 | Dynamic generation method for access key of automobile electronic information card |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103106421A (en) * | 2013-01-21 | 2013-05-15 | 厦门市路桥信息工程有限公司 | Electronic tag encryption method and charge management system based on 18000-6C standard |
| CN103336977A (en) * | 2013-05-24 | 2013-10-02 | 天津广行科技有限公司 | Vehicle electronic information card safety protection system and method |
| CN105788007A (en) * | 2016-02-25 | 2016-07-20 | 上海众人网络安全技术有限公司 | Parking management system and method based on dynamic tokens |
| CN106603496A (en) * | 2016-11-18 | 2017-04-26 | 新智数字科技有限公司 | Data transmission protection method, intelligent card, server, and communication system |
| CN106953725A (en) * | 2015-10-16 | 2017-07-14 | 大众汽车有限公司 | For method and system derived from asymmetrical key |
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| CN106603496A (en) * | 2016-11-18 | 2017-04-26 | 新智数字科技有限公司 | Data transmission protection method, intelligent card, server, and communication system |
| CN106603496B (en) * | 2016-11-18 | 2019-05-21 | 新智数字科技有限公司 | A kind of guard method, smart card, server and the communication system of data transmission |
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Application publication date: 20121219 |