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The exponential growth of internet and drastic enhancement in telecommunication has made the Internet a part of every aspect in the world. Internet is now the heart of the day to day business dealings throughout the world. This has increased the seeking for sensitive data by the attacker. This in turn increased the necessity to protect data through the Internet. Virtual Private Network (VPN) is a popular service to logically construct private network using the existing public infrastructure. It helps in constructing a geographically dispersed LAN that can securely communicate data using the Internet as the backbone communication network.
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