Privacy-Protected Certificateless Aggregate Signature Scheme in VANET

An Anonymous Authentication Scheme in VANETs of Smart City Based on Certificateless Group Signature

“…According to the literature [15], we choose a hardware platform consisting of Intel I7-6700 and Windows7 with 8G processor memory. By performing elliptic curve/bilinear pairing simulation experiments multiple times and taking the average value of the results, the operation execution schedule can be obtained as shown in Table 2.…”

“…Considering the overall performance of the scheme, we will focus on analyzing the time overhead in the signature generation and signature verification process. is scheme is compared with the existing schemes [14,15]. In the signature generation phase, scalar multiplication of bilinear pairs is mainly used in the scheme [14,15].…”

“…is scheme is compared with the existing schemes [14,15]. In the signature generation phase, scalar multiplication of bilinear pairs is mainly used in the scheme [14,15]. e overall multiplication operation is less than this scheme, but the length of a single multiplication operation is longer than the elliptic curve multiplication and modular multiplication operations used in this scheme, and the overall time overhead is greater than the time overhead of this scheme; moreover, in the signature generation, the calculation of 2T EC MUL + 2T MUL is a fixed calculation, and it does not need to participate in each calculation process, which can further reduce the calculation cost of group members when performing signature generation.…”

“…e overall multiplication operation is less than this scheme, but the length of a single multiplication operation is longer than the elliptic curve multiplication and modular multiplication operations used in this scheme, and the overall time overhead is greater than the time overhead of this scheme; moreover, in the signature generation, the calculation of 2T EC MUL + 2T MUL is a fixed calculation, and it does not need to participate in each calculation process, which can further reduce the calculation cost of group members when performing signature generation. In the signature verification phase, the time-consuming bilinear operation in the scheme [14,15] increases the time overhead, and the signature verification process of this scheme is not much different from the signature generation calculation overheads, as shown in Table 3. e comparison of signature generation and signature verification overhead for the three schemes is shown in Figure 3.…”

“…Based on the group signature technology, Chen et al [9] and Li et al [10] proposed different certificateless group signature schemes. At the same time, certificateless group signature schemes applied to VANETs have also been proposed [11][12][13][14][15][16][17], which has also become a hotspot in the security of VANETs. Zhang et al [12] and Chen et al [14] used bilinear pairings to study the application of the certificateless group signature in VANETs, avoiding the problem of key escrow, without the need for certificate management, effectively reducing the system storage load.…”