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. 2018 May 7;18(5):1453. doi: 10.3390/s18051453

Table 1.

List of notations and definitions.

Notation	Definitions
$T A$	A trusted authority
$R_{j}$	The j-th RSU
$V_{i}$	The i-th vehicle
$s, P_{p u b}$	the private key and public key of TA
$c e r t_{R_{j}}$	A certificate of $R_{j}$ issued by TA
$I D_{\{R_{j}, V_{i}\}}$	The real identity of $R_{j}$ or $V_{i}$
$V P_{i}$	The validity period of $I P I D$
$I P I D_{V_{i}}$	An internal pseudonym identity of $V_{i}$ , generated by the TA based on $I D_{V_{i}}$
$P P I D_{i, t}$	The public pseudonym identity of $V_{i}$ , generated from $I P I D_{V_{i}}$ of $V_{i}$
$h_{\{R_{j}, TA\}}$	A hash-based message authentication code generated by $R_{j}$ or the TA
$E_{π} (.) / D_{π} (.)$	A symmetric encryption scheme, where $π$ is the key