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This paper shows a novel network structure called laminarnet, which is constructed by building (virtual) networks over existing (physical or virtual) networks using VPN (Virtual Private Network) technology. This structure can provide a simple and practical infrastructure for single and multiple levels of security assurance based on cryptography, PKI (Public Key Infrastructure) or other standard/emerging schemes. Physically connected network is called the level-1 laminarnet. A multi-level laminarnet, i.e. a secure LAN (Local Area Network) is shown. A preliminary study on the performance is also reported.
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