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Due to the insecurity of Internet, many enterprises and schools develop and adopt a Virtual Private Network (VPN) technology for secure intercommunication in this global open network. VPN arouses people's attention with its characteristics of safe, reliable, economical and effective transmission via a public network. This paper introduces the concept of… (More)
[This corrects the article DOI: 10.1186/s40064-016-2608-4.].