to threats from within and outside the organization. The new openness of networked communications introduces new ethical, financial, and regulatory pressures to protect networks and enterprises from internal and external threats and attacks. Every IT security professional should be up-to-date on the Top Ten challenges to enterprise security—and the latest recommendations to address those challe...

VANET (Vehicular Ad-hoc Network) which is a hy- brid network (combination of infrastructure and infra- structure-less networks) is an emergent technology with promising future as well as great challenges especially in security. By the other hand this type of network is very sensible to safety problem. This paper focuses on a new mechanism for DoS (denial of service) attacks on the physical and ...