EP3769461A1 - Procede d'emission de donnees depuis un vehicule automobile et procede de reception desdites donnees par un autre vehicule, a travers un canal de communication radio - Google Patents
Procede d'emission de donnees depuis un vehicule automobile et procede de reception desdites donnees par un autre vehicule, a travers un canal de communication radioInfo
- Publication number
- EP3769461A1 EP3769461A1 EP19711980.3A EP19711980A EP3769461A1 EP 3769461 A1 EP3769461 A1 EP 3769461A1 EP 19711980 A EP19711980 A EP 19711980A EP 3769461 A1 EP3769461 A1 EP 3769461A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- key
- message
- vehicle
- numbers
- data
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0861—Generation of secret information including derivation or calculation of cryptographic keys or passwords
- H04L9/0869—Generation of secret information including derivation or calculation of cryptographic keys or passwords involving random numbers or seeds
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0861—Generation of secret information including derivation or calculation of cryptographic keys or passwords
- H04L9/0877—Generation of secret information including derivation or calculation of cryptographic keys or passwords using additional device, e.g. trusted platform module [TPM], smartcard, USB or hardware security module [HSM]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
- H04L9/3226—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials using a predetermined code, e.g. password, passphrase or PIN
- H04L9/3228—One-time or temporary data, i.e. information which is sent for every authentication or authorization, e.g. one-time-password, one-time-token or one-time-key
Definitions
- the present invention generally relates to a method for securely transmitting data from a motor vehicle A, through a communication channel, and a secure data receiving method by a motor vehicle B through a communication channel .
- the challenges are to guarantee the authenticity, integrity and anonymization of the data. For example, it must be impossible to follow a vehicle while listening to the data it emits.
- a known solution to anonymize the data transmitted by a vehicle while ensuring the confidentiality and integrity of this data is based on the use of public and private key certificates.
- This solution requires a PKI infrastructure capable of generating a very large number of certificates. It is estimated that with such a system, each communicating vehicle must use a new certificate every 800 meters. At the scale of a country like France, it would therefore generate billions of certificates per year, which would require deploying several hundred servers in France.
- a first aspect of the invention relates to a data transmission method, from a motor vehicle (A), through a radio communication channel, comprising:
- a obtaining step in which said vehicle obtains from a distribution entity a plurality of series of numbers each containing
- a first key Z said first key Z being the result of a calculation consisting of raising the base g, to a power z, ⁇ , where z, is a secret number chosen by said distribution entity, in order to obtain g 1 , then calculate g t Zi modulo p, ⁇
- a step of creating a message M conveying the data (data) from a first group of numbers containing p, ⁇ , g, and Z, during which the vehicle A:
- the present invention makes it possible to anonymize the communications of the vehicle while ensuring the confidentiality and integrity of the message.
- the cryptographic means used are efficient, very fast and little consuming in computing resources.
- the second key K aZi is for single use, intended to be used only for the message M.
- the vehicle performs at least one of the cryptographic operations of the group comprising an operation of encrypting the content of the body of the message using the second key K aZi and a cryptographic operation of signing the message to the user. using the second key K aZi .
- the vehicle executes said cryptographic operation using the second key K aZi only on the body of the message.
- the vehicle can insert a random number into the body of the message.
- the invention also relates to a method of receiving, by a second vehicle, a message M transmitted by a first vehicle, through a communication channel, according to the transmission method that has just been defined, characterized in that it comprises: a obtaining step in which said second vehicle obtains from a distribution entity and stores in memory, in a table, a plurality of series of numbers each containing a base g,
- a first key Z said first key being the result of a calculation consisting of raising the base g, to a power z, ⁇ , where z, is a secret number chosen by said distribution entity, in order to obtain g 1 , then to calculate g 1 modulo p, ⁇
- a step of calculating a second key K aZi consisting of raising the first key Z to the power a to obtain Z t a and then calculating Z t a modulo p, ⁇ ;
- At least one cryptographic processing step of the message M received using the second key K aZi is at least one cryptographic processing step of the message M received using the second key K aZi .
- the second vehicle verifies the authenticity of the message M by verifying the validity of the signature using the second key K aZi .
- the second vehicle decrypts the message using the second key K az i t ue st year C
- a device for securing radio communications for a motor vehicle comprising means arranged to implement the steps of the transmission method and the steps of the reception method, as previously defined.
- a final aspect of the invention relates to a motor vehicle incorporating a security device according to the preceding claim.
- FIG. 1 represents a phase of obtaining series of numbers by two vehicles A and B with a distribution entity BO ("backoffice"), according to a particular embodiment
- FIG. 2 illustrates a particular implementation of the transmission method and of the reception method of the invention
- FIG. 3 represents substeps of a step of preparing a message M conveying data (called "data") to be transmitted;
- FIG. 4 represents a block diagram of a vehicle
- vehicle A configured to implement the transmission and reception methods of FIG. 2.
- the present invention relates to securing communications of a motor vehicle communicating. More particularly, it relates to a method for the secure transmission of data by a motor vehicle through a communication channel, a method for the secure reception of data by a motor vehicle through a communication channel and a method for the secure transmission of data between a first motor vehicle and a second motor vehicle.
- a method of data transmission called "data" from a motor vehicle A, said transmitter, to a motor vehicle B, said receiver.
- the invention applies more generally to the transmission of data from a motor vehicle through a communication channel and to the receipt of data by a motor vehicle through a communication channel.
- FIG. 1 there is shown a system for implementing the transmission and reception methods of the invention, according to a particular embodiment.
- the system comprises a public key infrastructure (PKI), an entity (for example a server) for distribution, also called a backoffice server "BO", a motor vehicle A and a motor vehicle B.
- PKI public key infrastructure
- BO backoffice server
- A motor vehicle
- B motor vehicle
- each of the entities comprising the server BO obtains a certificate containing a public and private key pair from the PKI infrastructure.
- the backoffice server BO obtains a CBO certificate containing a public and private key pair from the PKI infrastructure.
- vehicle A obtains a CA certificate containing a public and private key pair from the PKI infrastructure.
- vehicle B obtains a certificate CB containing a pair of public and private keys from the PKI infrastructure.
- the certificates are here to allow the establishment of secure communications between each of the entities comprising the vehicle A, the vehicle B and the backoffice server BO.
- the communications between each vehicle A, B and the backoffice server BO could be secured by the use of an identifier and a password or by any other method of securing.
- the backoffice server BO generates series of numbers, for example N series of numbers (different from each other), during a step E04.
- N series of numbers
- i index of each series where i is an integer between 1 and N.
- Each series of index numbers i contains the following elements:
- V i a validity number associated with said first key Z, and more specifically with a first group of numbers containing p, ⁇ , g, and
- the first key Z is generated from a secret number
- the computation of the first key Z consists of raising the base g, to a power z, ⁇ , where, in order to obtain g ⁇ Z ⁇ , then to calculate gi Zi modulo pi.
- the number where z is advantageously a random number generated by the backoffice server BO.
- the validity V i is an identifier, for example a number, assigned to the series of index numbers i and identifying this series in a unique manner.
- This number is a sequence of X digits (each digit being a natural integer between 0 and 9) where X is large enough to provide a unique identification of the index series i.
- X is greater than or equal to 20, preferably greater than or equal to 30.
- Each vehicle A (B) then executes a step E1 1 (E12) obtaining series of numbers, prior to the establishment of secure and anonymous communications, for the purpose of obtaining sets of numbers. numbers generated by the backoffice server and intended for securing and anonymizing communications.
- E1 1 obtaining series of numbers
- Step E11 comprises a first substep E1 10 mutual authentication between the vehicle A and the backoffice server BO.
- the vehicle A connects to the backoffice server BO and the two entities A and BO mutually authenticate each other using their respective certificates CA and CBO.
- the vehicle A transmits to the backoffice server BO a request to obtain a plurality of series of numbers, during a second substep.
- the initialization message is advantageously signed by the backoffice server BO using its CBO certificate. In a particular embodiment, the initialization message is partially signed.
- the vehicle A checks the signature of the message using the public key of the server BO to verify its authenticity, in a fourth substep. If the authentication of the message is successful, the vehicle A stores in memory, in a table, the series of numbers retrieved from the backoffice server BO, during a fifth substep. In case of authentication failure, the obtaining of series of numbers is interrupted.
- the initialization message may also contain, for each series of numbers, time information relating to the use of the key Zi, for example a start date of use of the key Zi.
- time information relating to the use of the key Zi, for example a start date of use of the key Zi.
- the keys can indeed have a limited validity period, predefined, from this date of beginning of use.
- the transmission of the data data from the vehicle A to the vehicle B comprises a method of transmitting the data by the vehicle A and a method of receiving the data by the vehicle B.
- the data data are both encrypted and signed. Encryption ensures the confidentiality of transmitted data.
- the signature makes it possible to guarantee the integrity of the electronic message and to authenticate the author (that is to say here the emitting vehicle A) while guaranteeing the anonymization of the data.
- the vehicle A To transmit the data data, the vehicle A creates a message M to convey said data data. Prior to the creation of the message M, the vehicle A generates an encryption key (hereinafter called a "second encryption key") for use only, to be used to encrypt and / or sign only on the message M.
- an encryption key hereinafter called a "second encryption key”
- the generation of the single-use key comprises three steps E20 to E22.
- the vehicle A In the first step E20, the vehicle A generates a random number and then, during the second step E21, it extracts from the storage table a first key Zi and the numbers associated with this first key Zi in the table, namely the base g ,, the prime number ,, and the validity 1
- the key Zi is chosen randomly in the table or in a predefined order scheduling keys in the table. In this case, the key Zi is chosen according to its period of validity.
- the vehicle A calculates a second key K azi raising the first Z drive, the power has to obtain Zi then calculating Z t modulo able
- the method then comprises a step E23 for preparing or creating the message M containing the data data to be transmitted, from the first group of numbers containing pg, and and using the one-time encryption key or second encryption key K aZi to encrypt the message.
- the step E23 for preparing the message M comprises a substep E230 in which the vehicle A extracts the numbers p and gi, associated with the first key Zi, from its table or storage memory, and then a sub-step.
- encryption uses the Advanced Encryption Standard (AES) symmetric encryption algorithm.
- the preparation step E23 of the message M also comprises a substep E232 for encrypting data data consisting in encrypting the data data using a symmetric encryption algorithm. , for example AES, and using the second key K aZi as a symmetric encryption key.
- the data data is concatenated with a random number RAND, for example four bits of value "0" or "1", generated by the vehicle A
- the concatenated data ( data, RAND) are encrypted by symmetric encryption using the second key K aZ ⁇ .
- the encrypted data is written (data, RAND) AES RaZl and constitutes the message body.
- Body (data, RAND) aes RaZl .
- the step E23 for preparing the message M then comprises a message signature sub-step E233 in which the vehicle A generates an electronic signature of the message M using a digital signature algorithm.
- a signature is generated from the body of the "Body" message.
- the signature of the message M is, for example, a message authentication code of the HMAC (keyed-hash message authentication code) type (for authentication code of a key message cryptographic fingerprint), calculated at the end of the message. using a hash function such as SHA-256. In this case, the signature is denoted HMAC K aZi (Body) SHA ⁇ 256 . Another hash function or other signature algorithm could be used.
- the message M thus has a format corresponding to the ordered concatenation of these elements, as represented below: However, the message M could have a different format. For example, the elements composing the message M could be concatenated in a different order.
- the step E23 for preparing the message M is followed by a step E24 for transmitting this message M, through a radio transmission channel, to the vehicle B.
- the transmitted message M is then received and processed by the user. vehicle B as described below.
- the message is both encrypted and signed using the K aZi single use key.
- the message could be encrypted using only the key K aZi or only signed with the key K azi
- the transmitter vehicle A performs at least one cryptographic operation (encryption or signature) on said message M using the key K aZi disposable (that is to say, valid only for the message M).
- a first step E30 the message M is received by the vehicle B. It is then processed to verify its authenticity and extract the data data conveyed in clear.
- a second step E31 the vehicle B extracts from the message M the validity value V i.
- a third step E32 the vehicle B extracts from its table or storage memory the first key that is associated with the validity Vi.
- a fourth step E33 the vehicle B decrypts the message header using the first key Z, and thus obtains the numbers a, pi and g, ⁇ . Then, in a fifth step E34, the vehicle B calculates a second key K aZi by raising the first key to the power a to obtain Z £ "and then calculating Z? modulo p r In other words, the vehicle B calculates the second key K aZi according to the following expression K aZi
- the vehicle B then performs a first step E35 cryptographic processing of the message M received, consisting of checking the signature HMAC K aZi (Body) SHA ⁇ 256 of the message, using the second key K az i calculated at step E34, to verify the authenticity of the message.
- Body contains the data data, possibly concatenated with a random number RAND.
- Steps E1 1 and E12 are respectively reiterated by vehicles A and B, regularly and / or depending on the needs of keys Zi.
- each vehicle A, B connects to the backoffice server BO and retrieves new series of numbers (g, ⁇ , r, -, Z), VI), as previously described.
- each vehicle A, B incorporates a device for securing radio communications, in particular for securing radio communications between motor vehicles, comprising means arranged to implement the steps of the transmission method and the steps of the reception method, as previously described.
- each vehicle comprises:
- a radio communication interface 1 through a radio communication channel
- a module 8 for processing a message M received able to implement steps E31 to E36,
- a module 9 for transmitting and receiving data through the radio interface in particular able to implement steps E24 and E30 so as to send and receive messages M conveying data data.
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- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1852338A FR3079045B1 (fr) | 2018-03-19 | 2018-03-19 | Procede d’emission de donnees depuis un vehicule automobile et procede de reception desdites donnees par un autre vehicule, a travers un canal de communication radio. |
| PCT/FR2019/050396 WO2019180335A1 (fr) | 2018-03-19 | 2019-02-21 | Procede d'emission de donnees depuis un vehicule automobile et procede de reception desdites donnees par un autre vehicule, a travers un canal de communication radio |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3769461A1 true EP3769461A1 (fr) | 2021-01-27 |
Family
ID=62873452
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19711980.3A Withdrawn EP3769461A1 (fr) | 2018-03-19 | 2019-02-21 | Procede d'emission de donnees depuis un vehicule automobile et procede de reception desdites donnees par un autre vehicule, a travers un canal de communication radio |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20210044435A1 (fr) |
| EP (1) | EP3769461A1 (fr) |
| FR (1) | FR3079045B1 (fr) |
| WO (1) | WO2019180335A1 (fr) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11159497B2 (en) * | 2020-01-29 | 2021-10-26 | Citrix Systems, Inc. | Secure message passing using semi-trusted intermediaries |
| US20230093668A1 (en) * | 2020-03-03 | 2023-03-23 | Telefonaktiebolaget Lm Ericsson (Publ) | Object Location Information Provisioning for Autonomous Vehicle Maneuvering |
| CN115174645B (zh) * | 2022-06-30 | 2024-03-26 | 北京新能源汽车股份有限公司 | 一种汽车ota车云交互方法及系统 |
-
2018
- 2018-03-19 FR FR1852338A patent/FR3079045B1/fr not_active Expired - Fee Related
-
2019
- 2019-02-21 US US16/980,374 patent/US20210044435A1/en not_active Abandoned
- 2019-02-21 WO PCT/FR2019/050396 patent/WO2019180335A1/fr not_active Ceased
- 2019-02-21 EP EP19711980.3A patent/EP3769461A1/fr not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019180335A1 (fr) | 2019-09-26 |
| US20210044435A1 (en) | 2021-02-11 |
| FR3079045B1 (fr) | 2021-12-03 |
| FR3079045A1 (fr) | 2019-09-20 |
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