EP1745651A1 - Procede pour authentifier des donnees de capteur et capteur associe - Google Patents

Procede pour authentifier des donnees de capteur et capteur associe

Info

Publication number
EP1745651A1
EP1745651A1 EP05753699A EP05753699A EP1745651A1 EP 1745651 A1 EP1745651 A1 EP 1745651A1 EP 05753699 A EP05753699 A EP 05753699A EP 05753699 A EP05753699 A EP 05753699A EP 1745651 A1 EP1745651 A1 EP 1745651A1
Authority
EP
European Patent Office
Prior art keywords
sensor
hash value
data
sensor data
receiver
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Withdrawn
Application number
EP05753699A
Other languages
German (de)
English (en)
Inventor
Kurt Eberhardt
Arnold Erni
Karl Hofmann
Peter Stifter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AIM Infrarot Module GmbH
Original Assignee
AEG Infrarot Module GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by AEG Infrarot Module GmbH filed Critical AEG Infrarot Module GmbH
Publication of EP1745651A1 publication Critical patent/EP1745651A1/fr
Withdrawn legal-status Critical Current

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
    • H04L9/32—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
    • H04L9/3236—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 cryptographic hash functions
    • 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
    • H04L9/3271—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 challenge-response
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
    • H04L2209/80—Wireless
    • H04L2209/805—Lightweight hardware, e.g. radio-frequency identification [RFID] or sensor

Definitions

  • the invention relates to a method for authenticating sensor data and an associated sensor.
  • a sensor module with an authentication unit is known from the published patent application DE 199 63 329 AI, which uses cryptographic methods to secure the sensor data to be transmitted. chert.
  • a hash value is calculated and encrypted with a secret sensor key (GS) with which the sensor data to be transmitted are authenticated.
  • GS secret sensor key
  • Cryptographic hash functions are mathematical methods that generate or calculate a value of a predetermined length in the sense of a checksum (hash value) from any data stream (e.g. sensor data, plain text) using a predetermined method.
  • Hash functions are primarily used to demonstrate the authenticity (integrity) of data and texts.
  • the encrypted hash value is decrypted and checked in the receiver. This ensures the origin and the integrity of the sensor data.
  • the data recorded by the sensor module are preferably consumption data, for example gas, electricity, water meters, etc., or biometric feature data, for example finger lines, which have a much smaller volume of data than imaging sensors.
  • the object of the invention is to provide a method for authenticating sensor data for tamper-proof data transmission and to provide an associated sensor.
  • the invention solves this problem by providing a method for authenticating sensor data with the features of claim 1 and by a sensor with the features of claim 5. gene of the sensor are claimed by claims 8 and 9.
  • the calculation of a cryptographic checksum is linked to a challenge response method (request-response method), this cryptographic checksum being transmitted to the receiver as authentication data following the sensor data.
  • the transmitted data can thus advantageously be processed in real time in the receiver and declared valid or invalid immediately after the check.
  • a session key (session key or one-time key) is generated between the at least one sensor and the receiver.
  • the at least one sensor receives a challenge from the receiver with an encrypted random number, which the at least one sensor decrypts and modifies it according to a method known on both sides.
  • This modified random number is then sent back to the recipient in encrypted form as a data block and represents the response to its request.
  • the recipient who in addition to the session key also knows the secret sensor key (GS), receives this data block and carries out the same modification like the sensor on its original random number and compares both numerical values. If the numerical values match, the authenticity of the sensor with respect to the receiver is ensured in this transmission session.
  • GS secret sensor key
  • Another advantage of the method according to the invention is achieved by including the sensor data to be transmitted in the formation of the cryptographic checksum for the authentication of the sensor data, since this enables the integrity of the transmitted data to be checked. Manipulation of the sensor data would have resulted in a change in the checksum that would be recognized by the receiver when it was evaluated. With the method according to the invention, even with public knowledge, a continuous security chain from the sensor that captures the data to central data management with a secure infrastructure is made possible, whereby an undetected manipulation of the transmitted sensor data is almost impossible.
  • the hash value calculation is carried out in parallel with the serial transmission of the sensor data, which is why this hash value is advantageously available as a cryptographic checksum directly after the transmission of the sensor data and can therefore be easily attached to the transmitted sensor data, with the result that Little time is required for encryption and the entire process is accelerated.
  • the received cryptographic checksum is checked in the receiver by first calculating a hash value from the received sensor data using the same method with which the second hash value is generated in the sensor, then decrypting the cryptographic checksum and finally the decryption result using first, the hash value calculated from the received sensor data is compared for identity.
  • a sensor comprises means for generating sensor data, an authentication unit, which in turn comprises a checksum generator for generating the cryptographic checksum and an encryption unit for encrypting the last, ie the second hash value.
  • the sensor is designed, for example, as an imaging sensor, preferably as an infrared camera and / or digital camera.
  • the authentication unit is integrated on the sensor module (sensor chip) and only requires about 10% additional chip area to implement the method according to the invention. This allows a compact embodiment of the sensor despite improved tamper protection.
  • the senor according to the invention is part of a person identification system. In another development, the sensor according to the invention is part of a monitoring system for objects and / or buildings.
  • Fig. 1 is a schematic block diagram of a monitoring system
  • FIG. 2 shows a block diagram of a sensor of the monitoring system from FIG. 1.
  • a monitoring system 10 for example for a building 1, comprises a plurality of sensors S1 to S4, which are connected via a bus system 3 to a receiver 2, which is, for example, part of a central data management system in which the can be evaluated and processed with a cryptographic checksum DS transmitted sensor data D.
  • the sensors S1 to S4 shown by way of example are preferably designed as imaging sensors, for example as infrared and / or digital cameras. In the field of security applications, such imaging sensors S1 to S4 are used to monitor objects and buildings and to identify people. Many intrusions and attacks take place to deceive, manipulate and overcome these systems. Such exchange and / or manipulation attempts must therefore be recognized and a corresponding alarm triggered in the receiver 2.
  • FIG. 2 shows a detailed block diagram of the sensor S1 from FIG. 1, only components relevant to the invention being shown.
  • the imaging sensor S1 comprises image recording means 5, a data processing device 6, an authentication unit 4 with a checksum generator 4.1 and an encryption unit 4.2 and an output control circuit 7.
  • the image recording means 5 comprise, for example, infrared sensors and / or optical sensors which record image information of a monitored environment and make it available as sensor data D for further processing and evaluation.
  • the sensor data D provided by the image recording means 5 are read into the checksum generator 4.1 in blocks, that is to say as data blocks Di of the same length, in order to carry out a block ciphering.
  • a cryptographic checksum DS is linked to a challenge-response method (request-response method), this cryptographic checksum DS being transmitted to the receiver as authentication data following the sensor data.
  • the receiver 2 sends a request (challenge) to the sensor S1, which contains an encrypted random number and is decrypted by the sensor S1 and modified according to a method known on both sides becomes.
  • This modified random number is then encrypted and sent back to the recipient as a data block and provides the Answer (response) to its request.
  • the receiver who in addition to the session key also knows the secret sensor key GS, receives this cryptographic checksum DS, carries out the same modification as the sensor on its original random number and compares both numerical values. If the numerical values match, the authenticity of the sensor with respect to the receiver is ensured in this transmission session.
  • Such a session key is only valid for a short time, i.e. only for a session or a requested data transfer.
  • a first hash value H is first determined for the entirety of all the data to be transmitted by means of the checksum generator 4.1 and then encrypted with the encryption unit 4.2.
  • the i-th hash value Hi is calculated from the i-th data block by using the hash value Hi-j. is encrypted as a key.
  • a secret sensor key GS stored in the encryption unit 4.2 and / or a value derived from the sensor key is used as the starting value H 0 for calculating the first hash value H x for the first data block Di.
  • the last iteratively generated hash value H N is subjected to a hash value calculation to generate the second hash value H 'as a key with the session key (session key, one-time key) as a data block.
  • the resulting hash value H ' is fed to the encryption unit 4.2 and encrypted there with the secret sensor key GS to form the cryptographic checksum DS.
  • the cryptographic checksum DS is transmitted as authentication data with the sensor data D to the receiver 2. This cryptographic checksum DS is thus transmitted to the receiver 2 directly after the complete transmission of a data frame on the same interface, that is to say via the data processing device 6 as DS + D.
  • the output control circuit 7 transmits the sensor data as a data frame to the receiver 2 via corresponding communication channels, which are designed as data bus 3 in the exemplary embodiment shown, the cryptographic checksum DS being appended to the end of the sensor data D combined as a data group (data frame), so that all data groups of the sensors with the associated checksum DS are transmitted to the receiver 2.
  • the receiver 2 can check the authenticity of the received data D by means of a hardware or software-based calculation of the cryptographic checksum DS, since it knows the key of the sending sensor S1 and the session key.
  • a hash value H ' E is thus initially calculated from the received sensor data D, the same method being used for this purpose with which the sensor generates the second hash value.
  • the cryptographic checksum DS is then decrypted and the decryption result compared to the hash value calculated first from the received sensor data for identity.
  • Data D from non-certified sensors or without an authentication file, i.e. without a checksum are discarded. If a swap and / or manipulation attempt is recognized when checking the checksum DS, then the receiver 2 triggers a corresponding alarm. Any communication channels, including wireless transmission methods, can be used to transmit the data D.
  • corresponding one-time keys (session key) are of course generated for all sensors S1, S2, S3 and S4 using the challenge-response method already described above, which act as the current key exclusively for the subsequent sensor data transmission serve the respective sensor and the receiver 2.
  • the authentication unit 4 can be integrated on the sensor chip, since only an additional area requirement of approximately 10% is required.
  • the sensors S1 to S4 shown can each be designed as single-chip assemblies in which all of the components shown in FIG. 2 are integrated on a single chip.
  • This method can also be used for secure data transmission with monolithically integrated sensor Ren are used that are used in security-relevant systems, such as access controls, border controls, e-commerce, etc., in which optical and / or electrical sensors are used, which have a large amount of data.
  • the senor according to the invention is part of a monitoring system for objects and / or buildings.
  • a monitoring system for objects and / or buildings are also possible, for example in a personal identification system.
  • the inventive inclusion of the sensor data to be transmitted in the formation of the hash value for the authentication of the sensor data ensures that the transmitted data is intact, since manipulation of the sensor data results in a changed checksum which is recognized by the receiver during evaluation ,
  • the method according to the invention is therefore also suitable for imaging sensor systems in an unprotected public environment with the requirement for secure data transmission.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Lock And Its Accessories (AREA)
  • Alarm Systems (AREA)

Abstract

L'invention concerne un procédé pour authentifier des données (D) de capteur, échangées entre au moins un capteur (Sl à S4) et un récepteur associé (2). Selon ledit procédé, une demande d'accès est d'abord transmise par le récepteur (2) audit au moins un capteur (S1 à S4) avec un nombre aléatoire codé ; cette demande est décodée par ledit au moins un capteur (Sl à S4) ; le nombre aléatoire est modifié et le nombre aléatoire modifié est utilisé comme clé unique (clé de session) pour la transmission consécutive de données de capteur (réponse) ; une première valeur de hachage (H) est calculée côté capteur à partir des données (D) de capteur ; une somme de contrôle cryptographique (DS) est générée pour l'authentification des données (D) de capteur à transmettre ; une seconde valeur de hachage (H') est calculée à partir de la première valeur de hachage (H) et de la clé unique comme bloc de données puis codée au moyen de la clé de capteur secrète (GS) ; les données (DS + D) de capteur authentifiées sont transmises au récepteur (2) et l'authenticité de la somme de contrôle cryptographique (DS) est vérifiée côté récepteur.
EP05753699A 2004-05-14 2005-05-17 Procede pour authentifier des donnees de capteur et capteur associe Withdrawn EP1745651A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004024002A DE102004024002B4 (de) 2004-05-14 2004-05-14 Verfahren zur Authentifizierung von Sensordaten und zugehörigem Sensor
PCT/DE2005/000915 WO2005112459A1 (fr) 2004-05-14 2005-05-17 Procede pour authentifier des donnees de capteur et capteur associe

Publications (1)

Publication Number Publication Date
EP1745651A1 true EP1745651A1 (fr) 2007-01-24

Family

ID=34970366

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05753699A Withdrawn EP1745651A1 (fr) 2004-05-14 2005-05-17 Procede pour authentifier des donnees de capteur et capteur associe

Country Status (4)

Country Link
US (1) US20080276092A1 (fr)
EP (1) EP1745651A1 (fr)
DE (1) DE102004024002B4 (fr)
WO (1) WO2005112459A1 (fr)

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Also Published As

Publication number Publication date
WO2005112459A1 (fr) 2005-11-24
DE102004024002B4 (de) 2008-05-21
US20080276092A1 (en) 2008-11-06
DE102004024002A1 (de) 2005-12-01

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