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However, since many users transmit a substantial number of messages, it may cause reception delays and affect the entire system. A certificateless aggregate signature scheme can provide a signature compression that keeps the verification cost low. Therefore, it is beneficial for environments constrained by time, bandwidth, and storage, such as vehicular ad hoc network. In recent years, several certificateless aggregate signature schemes have been proposed. Unfortunately, some of them still have some security and privacy issues under specific existing attacks. This article offers an authentication scheme that can improve security, privacy, and efficiency. First, we apply the certificateless aggregate signature method to prevent the onboard unit devices from leaking sensitive information when sending messages. The scheme is proven to be secure against the Type-1 [Formula: see text] and Type-2 [Formula: see text] adversaries in the random oracle model under the computational Diffie\u2013Hellman problem assumption. Then, the performance evaluation demonstrates that our proposed scheme is more suitable for deployment in vehicular ad hoc network environments.<\/jats:p>","DOI":"10.1177\/15501329221080658","type":"journal-article","created":{"date-parts":[[2022,5,7]],"date-time":"2022-05-07T09:05:51Z","timestamp":1651914351000},"page":"155013292210806","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":31,"title":["A certificateless aggregate signature scheme for security and privacy protection in VANET"],"prefix":"10.1177","volume":"18","author":[{"given":"Eko Fajar","family":"Cahyadi","sequence":"first","affiliation":[{"name":"Department of Computer Science and Information Engineering, Asia University, Taichung"},{"name":"Faculty of Telecommunication and Electrical Engineering, Institut Teknologi Telkom Purwokerto, Purwokerto, Indonesia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tzu-Wei","family":"Su","sequence":"additional","affiliation":[{"name":"Department of Management Information Systems, National Chung Hsing University, Taichung"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chou-Chen","family":"Yang","sequence":"additional","affiliation":[{"name":"Department of Management Information Systems, National Chung Hsing University, Taichung"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5502-8033","authenticated-orcid":false,"given":"Min-Shiang","family":"Hwang","sequence":"additional","affiliation":[{"name":"Department of Computer Science and Information Engineering, Asia University, Taichung"},{"name":"Department of Medical Research, China Medical University Hospital, China Medical University, Taichung"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2022,5,7]]},"reference":[{"issue":"3","key":"bibr1-15501329221080658","first-page":"399","volume":"22","author":"Faisal SM","year":"2020","journal-title":"Int J Netw Sec"},{"key":"bibr2-15501329221080658","doi-asserted-by":"publisher","DOI":"10.1109\/VETECS.2008.458"},{"key":"bibr3-15501329221080658","doi-asserted-by":"publisher","DOI":"10.1109\/MCOM.2010.5621980"},{"key":"bibr4-15501329221080658","doi-asserted-by":"publisher","DOI":"10.1109\/TITS.2015.2492981"},{"key":"bibr5-15501329221080658","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0257044"},{"issue":"6","key":"bibr6-15501329221080658","first-page":"1065","volume":"23","author":"Xie PS","year":"2021","journal-title":"Int J Netw Sec"},{"issue":"6","key":"bibr7-15501329221080658","first-page":"1049","volume":"23","author":"Xie PS","year":"2021","journal-title":"Int J Netw Sec"},{"issue":"6","key":"bibr8-15501329221080658","first-page":"955","volume":"19","author":"Ibrahim S","year":"2017","journal-title":"Int J Netw Sec"},{"key":"bibr9-15501329221080658","unstructured":"Castro R, Dahab R. 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