A secure communication system includes an outer VPN gateway representative of an outer tunnel for facilitating communication with a black network. The outer VPN gateway includes a first Ethernet port and first program instructions for providing a first layer of encryption. The secure communication system, further includes an inner VPN gateway representative of an inner tunnel for facilitating communication with a red network. The inner VPN gateway comprises a second Ethernet port and second program instructions for providing a second layer of encryption. The secure communication system further includes a coupling bracket for mechanically coupling the inner VPN gateway with the outer VPN gateway, and for facilitating communication between the inner VPN gateway and the outer VPN gateway by interfacing with the first Ethernet port and the second Ethernet port.