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In recent years, there have been major developments in, and deployment of, diverse mobile technology. Security issues in mobile computing are now presenting significant challenges. The ability to move from one network to another, and from one provider to another creating thus vertical and horizontal handoffs, has increased the complexity of mobile security. There are many research groups, such as Hokey and Y-Comm, working on the design of security architectures for 4G networks. Heterogeneous networks are the convergence of wired and wireless networks, other diverse end user devices and other communication technologies which provide very high speed connections. Major security challenges in 4G heterogeneous networks are inherent in current internet security threats and IP security vulnerabilities.
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