Anonymous Authentication Protocols for Vehicular Ad Hoc Networks: An Overview <s> Confidentiality-oriented scheme <s> Privacy and security should be paid much more attention in secure vehicular ad hoc networks (VANETs). However, as far as we know, few researches on secure VANET protocols have addressed both the privacy issues and authenticated key establishment. Therefore, in this work, a lightweight authenticated key establishment scheme with privacy preservation to secure the communications between mobile vehicles and roadside infrastructure in a VANET is proposed, which is called SECSPP. Our proposed scheme not only accomplishes vehicle-to-vehicle and vehicle-to-roadside infrastructure authentication and key establishment for communication between members, but also integrates blind signature techniques into the scheme in allowing mobile vehicles to anonymously interact with the services of roadside infrastructure. We also show that our scheme is efficient in its implementation on mobile vehicles in comparison with other related proposals. <s> BIB001 </s> Anonymous Authentication Protocols for Vehicular Ad Hoc Networks: An Overview <s> Confidentiality-oriented scheme <s> VANETs have the potential to dramatically increase road safety by giving drivers more time to react adequately to dangerous situations. To prevent abuse of VANETs, a security infrastructure is needed that ensures security requirements like message integrity, confidentiality, and availability. After giving more details on the requirements we propose a security infrastructure that uses asymmetric as well as symmetric cryptography and tamper resistant hardware. While fulfilling the requirements, our proposal is especially designed to protect privacy of the VANET users and proves to be very efficient in terms of computational needs and bandwidth overhead. <s> BIB002 </s> Anonymous Authentication Protocols for Vehicular Ad Hoc Networks: An Overview <s> Confidentiality-oriented scheme <s> Vehicular networks are very likely to become the most pervasive and applicable of mobile ad hoc networks in this decade. Vehicular Ad hoc NETwork (VANET) has become a hot emerging research subject, but few academic publications describing its security infrastructure. In this paper, we review the secure infrastructure of VANET, some potential applications and interesting security challenges. To cope with these security challenges, we propose a novel secure scheme for vehicular communication on VANETs. The proposed scheme not only protects the privacy but also maintains the liability in the secure communications by using session keys. We also analyze the robustness of the proposed scheme. <s> BIB003
The need for confidentiality in specific scenarios of VANET implementations has also been discussed in recent works Kamat et al. (2006) ; BIB001 ; BIB002 ; BIB003 . Specifically in BIB003 , the protocols of  are extended: session keys for pairs of vehicles are established by using the Diffie-Hellman key agreement protocol while group session keys are established using the key transfer approach. These keys are used for both message authentication and confidentiality BIB003 . A lightweight authenticated key establishment scheme with privacy preservation and confidentiality to secure the communications in VANET is proposed by BIB001 . Meantime, two security frameworks for VANETs to provide authentication, confidentiality, non-repudiation and message integrity have also been proposed by BIB002 and Kamat et al. (2006) independently. Nevertheless, all of these works Kamat et al. (2006) ; BIB001 ; BIB002 ; BIB003 suffer from the same criticism in LAB, in other words, each OBU has to take a large storage space to store a huge number of anonymous key pairs.