Existing one-time identity-based aggregate signature technique. With this technique

Existing
secure and privacy-preserving vehicular
communication
protocols in vehicular ad hoc networks face the
challenges of being fast and not depending on ideal tamper-proof
devices (TPDs) embedded in vehicles. To address these challenges,
propose a vehicular authentication protocol referred to as distributed aggregate privacy-preserving authentication. The pro- posed protocol is based on our new multiple trusted
authority one-time identity-based aggregate signature technique.
With this
technique a vehicle can verify many messages simultaneously and their signatures can be compressed into a single one that greatly reduces the storage
space needed by a vehicle or a data collector (e.g., the traffic management authority). Instead of ideal TPDs, our
protocol only requires realistic TPDs and hence is more practical.

In VANET some serious
network attacks such as man in middle attack, masquerading is possible. Vehicle privacy
is also a critical concern. A vehicular message usually contains information on
a vehicle’s speed, location, direction etc. From those messages, a lot of
private information about the driver can be inferred. Furthermore, malicious
vehicles may send fake messages to misguide other vehicles into accidents. This
implies that privacy should be conditional in the sense that the message
generators should be traceable when fake messages cause harms. For this
purpose, the vehicle-generated messages must be stored by the receiving
vehicles and other entities (e.g., the traffic management authority). In VANET,
each vehicle broadcasts a message to nearby vehicles and RSUs every few
hundreds of milliseconds. A vehicle or an RSU may receive

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hundreds of messages in a short period. If the
messages cannot be processed in time, traffic jams and even accidents may
ensue.

             Hence, it is critical to devise
security and privacy mechanisms that do not lead to an unaffordable reaction
delay. Existing secure and
privacy-preserving vehicular communication protocols in vehicular ad hoc
networks face the challenges of being fast and not depending on ideal
tamper-proof devices (TPDs) embedded in vehicles. The proposed protocol is based on a new multiple
trusted authority one-time identity based, frequency and attribute – based
aggregate signature technique. A vehicle is able to verify many messages at the
same time and their signatures can be compressed as a single unit. This reduces
the storage space required by a vehicle or a data collector to a considerable
extend. A practical cooperative message authentication protocol is
proposed to elevate the verification burden, where each vehicle just needs to
verify a small amount of messages. The details of possible attacks and the
corresponding solutions are also discussed.

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