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Vehicular ad hoc networks (VANETs) are being increasingly advocated for traffic control, accident avoidance, and management of parking lots and public areas. Security and privacy are two major concerns in VANETs. Unfortunately, in VANETs, most privacy-preserving schemes are vulnerable to Sybil attacks, whereby a malicious user can pretend to be multiple (other) vehicles. In this paper, we present...
In nonhierarchical public key infrastructure (PKI), any user can be a certificate authority (CA) to issue digital certificates to other users. As there is no single root CA, it is difficult to check the validity of certificates issued by unknown CAs. It is very risky to trust them without in-depth analysis. How users issue certificates in the real world has not been studied. Solomon Aschpsilas conformity...
Vehicular ad hoc networks (VANETs) are being advocated for traffic control, accident avoidance, and a variety of other applications. Security is an important concern in VANETs because a malicious user may deliberately mislead other vehicles and vehicular agencies. One type of malicious behavior is called a Sybil attack, wherein a malicious vehicle pretends to be multiple other vehicles. Reported data...
Today, companies called service providers enable communications and control the related infrastructures. However, with increased computing power, advanced wireless technologies and more standardized terminals, users in the future will be able to take more control of communications. In this paper, we define and discuss a disruptive communication model called user-assisted communications (UAC), which...
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