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) (c. 799)

ANNEX I C U.K. Requirements for construction, testing, installation, and inspection

Appendix 11

COMMON SECURITY MECHANISMS U.K.

PART B U.K. SECOND-GENERATION TACHOGRAPH SYSTEM

12. VU — MOTION SENSOR PAIRING AND COMMUNICATION U.K.

12.3. VU — Motion Sensor Pairing and Communication using AES U.K.

CSM_219 The pairing information that is sent in instructions 43 (VU request) and 50 (MoS reply) shall be assembled as specified in section 7.6.10 of [ISO 16844-3], except that the AES algorithm shall be used instead of the TDES algorithm in the pairing data encryption scheme, thus resulting in two AES encryptions, and adopting the padding specified in CSM_220 to fit with the AES block size. The key K'_p used for this encryption shall be generated as follows: U.K.

• In case the pairing key K_P is 16 bytes long: K'_p = K_P XOR (N_s||N_s)

• In case the pairing key K_P is 24 bytes long: K'_p = K_P XOR (N_s||N_s||N_s)

• In case the pairing key K_P is 32 bytes long: K'_p = K_P XOR (N_s||N_s||N_s||N_s)

where N_s is the 8-byte serial number of the motion sensor.