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Commission Implementing Regulation (EU) 2016/799 of 18 March 2016 implementing Regulation (EU) No 165/2014 of the European Parliament and of the Council laying down the requirements for the construction, testing, installation, operation and repair of tachographs and their components (Text with EEA relevance)
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Note: readers of this section are supposed to be familiar with the contents of [ISO 16844-3] describing the interface between a vehicle unit and a motion sensor. The pairing process between a VU and a motion sensor is described in detail in chapter 12 of this Appendix.U.K.
Table 3 | ||||
Keys for securing vehicle unit — motion sensor communication | ||||
a Storage of KM and KID is optional, as these keys can be derived from KM-VU, KM-WC and CV. | ||||
Key | Symbol | Generated by | Generation method | Stored by |
---|---|---|---|---|
Motion Sensor Master Key — VU part | KM-VU | ERCA | Random | ERCA, MSCAs involved in issuing VUs certificates, VU manufacturers, vehicle units |
Motion Sensor Master Key — Workshop part | KM-WC | ERCA | Random | ERCA, MSCAs, card manufacturers, workshop cards |
Motion Sensor Master Key | KM | Not independently generated | Calculated as KM = KM-VU XOR KM-WC | ERCA, MSCAs involved in issuing motion sensors keys (optionally)a |
Identification Key | KID | Not independently generated | Calculated as KID = KM XOR CV, where CV is specified in CSM_106 | ERCA, MSCAs involved in issuing motion sensors keys (optionally)a |
Pairing Key | KP | Motion sensor manufacturer | Random | One motion sensor |
Session Key | KS | VU (during pairing of VU and motion sensor) | Random | One VU and one motion sensor |
Note: The version number is used to distinguish different generations of these keys, as explained in detail in section 9.2.1.2.U.K.
[F1For 128-bit motion sensor master keys: CV = ‘ B6 44 2C 45 0E F8 D3 62 0B 7A 8A 97 91 E4 5D 83 ’]
For 192-bit motion sensor master keys: CV = ‘72 AD EA FA 00 BB F4 EE F4 99 15 70 5B 7E EE BB 1C 54 ED 46 8B 0E F8 25’
For 256-bit motion sensor master keys: CV = ‘1D 74 DB F0 34 C7 37 2F 65 55 DE D5 DC D1 9A C3 23 D6 A6 25 64 CD BE 2D 42 0D 85 D2 32 63 AD 60’
Textual Amendments
Note: the constant vectors have been generated as follows:U.K.
Pi_10 = first 10 bytes of the decimal portion of the mathematical constant π = ‘24 3F 6A 88 85 A3 08 D3 13 19’
CV_128-bits = first 16 bytes of SHA-256(Pi_10)
CV_192-bits = first 24 bytes of SHA-384(Pi_10)
CV_256-bits = first 32 bytes of SHA-512(Pi_10)
Note: as explained in section 9.2.1.2, in fact a motion sensor manufacturer may have to generate multiple unique pairing keys for a single motion sensor.U.K.
Note: as explained in section 9.2.1.2, in fact a motion sensor manufacturer may have to insert multiple encrypted pairing keys and multiple encrypted serial numbers in a single motion sensor.U.K.
Note: doing so will allow a second-generation motion sensor to be coupled to a first-generation VU.U.K.
Figure 2
Issuance and usage of different generations of the motion sensor master key in vehicle units, motions sensors and workshop cards
Note: this implies that in the last year of the validity period of an ERCA certificate, workshop cards will be issued with three different generations of KM-WC, as shown in Figure 2.U.K.
Note: This implies that in the last year of the validity period of an ERCA certificate, motion sensors will be issued with encrypted data based on three different generations of KM, as shown in Figure 2.U.K.
Note: In case the motion sensor manufacturer chooses to generate a TDES-based pairing key for a second-generation motion sensor (see CSM_111), the manufacturer shall indicate to the MSCA that the TDES-based motion sensor master key must be used for encrypting this pairing key. This is because the length of a TDES key may be equal to that of an AES key, so the MSCA cannot judge from the key length alone.U.K.
Note: The version number is used to distinguish different generations of the DSRC master key, as explained in detail in section 9.2.2.2.U.K.
This VU serial number shall be identical to the vuSerialNumber element of VuIdentification, see Appendix 1 and to the Certificate Holder Reference in the VU’s certificates.
The VU serial number may not be known at the moment a vehicle unit manufacturer requests the VU-specific DSRC keys. In this case, the VU manufacturer shall send instead the unique certificate request ID it used when requesting the VU’s certificates; see CSM_153. This certificate request ID shall therefore be equal to the Certificate Holder Reference in the VU’s certificates.]
Step 1 (Extract):
PRK = HMAC-Hash (salt, IKM) where salt is an empty string ‘’ and IKM is KMDSRC.
Step 2 (Expand):
OKM = T(1), where
T(1) = HMAC-Hash (PRK, T(0) || info || ‘01’) with
T(0) = an empty string (‘’)
[F1info = VU serial number or certificate request ID, as specified in CSM_123]
K_VUDSRC_ENC = first L octets of OKM and
K_VUDSRC_MAC = last L octets of OKM
where L is the required length of K_VUDSRC_ENC and K_VUDSRC_MAC in octets.
Note: as explained in section 9.2.2.2, in fact multiple generations of KMDSRC may have to be inserted in a single workshop card or control card.U.K.
Figure 3
Issuance and usage of different generations of the DSRC master key in vehicle units, workshop cards and control cards
Note: this implies that in the last two years of the validity period of an ERCA certificate, control cards will be issued with three different generations of KMDSRC, as shown in Figure 3.U.K.
Note: this implies that in the last year of the validity period of an ERCA certificate, workshop cards will be issued with three different generations of KMDSRC, as shown in Figure 3.U.K.
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