ABSTRACT
The vehicular social network (VSN) participants are limited to vehicles, but can also be passengers and pedestrians using smartphones or other portable devices. Security and privacy are key factors for designing and deploying a large-scale trustworthy VSN. The situation could be worse if a malicious user were able to equip herself with multiple seemingly valid identities and affect the system. Crowdsourcing-based mobile applications have been widely used for enhancing transportation efficiency and safety. While group signatures can be used to protect transmitted messages, such schemes incur high computational overhead for signature generation and verification. In vehicular communication systems, privacy is a main concern due to the location information included in transmitted messages. This has been addressed by pseudonymous authentication; thus, locations in the messages cannot be linked to any real vehicle identity.
