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Table 1 Notations

From: SD2PA: a fully safe driving and privacy-preserving authentication scheme for VANETs

Notation Description
\( {\text{RID}} \) Vehicle real identity
\( {\text{h}} \)(.) General hash function
\( TA \) Trusted authority
\( RSU \) Roadside unit
\( OBU \) On-board unit
\( L_{TA - OBU} \) List of OBUs information saved in the TA
\( L_{RSU - OBU} \) List of RSU–OBU authentication data saved in the RSU
\( PWD_{1} \) OBU login password
\( PWD_{2} \) \( OBU - TA \) verification password
\( C_{1,} C_{2} \) Critical areas between two \( RSUs \)
\( V_{i} \) The \( i \)th vehicle
\( {\text{CR}}_{v} \) \( V_{i} \)’s conventional public authentication key
\( Tlist \) A temporary list in the RSUs for saving vehicle information, which is in the critical area
\( ID_{R} \) The identity of the \( RSU \)
\( ID_{R + 1} \) The identity of the neighbouring RSU, which is next to the vehicle’s current \( RSU \)
\( ID_{R - 1} \) The identity of the neighbouring RSU, which is prior to the vehicle’s current \( RSU \)
\( S_{R - V} \) \( OBU - RSU \) authentication secret key
\( {\text{SK}}_{{{\text{R}} - {\text{TA}}}} \) \( RSU - TA \) authentication secret key
\( T \) The timestamp
\( indx \) The vehicle’s group index number in the \( L_{RSU - OBU} \)
\( PID_{i} \) \( V_{i} \)’s pseudonym
Concatenation operation
\( \oplus \) Exclusive-OR operation
\( int \) Integer number
\( M_{i} \) \( V_{i} \)’s traffic-related message
\( L \) Hash signature calculated by the \( RSU \) during the authentication phase