The solution for this security issue is CompuDiode by Compumatica. With CompuDiode access to the PCS systems from the internet is protected which makes attacks from the outside impossible.
CompuDiode consists of an ‘air gap’ and two NextGen firewalls (CompuWall). An ‘air gap’ is a fiber connection and works as a diode whereby only one traffic direction is possible. The diode separates the two networks from each other which means that the control circuitry (PCS) can reach the internet but not the other way around. Attacks from the outside are not possible anymore.
To provide an extra secure solution CompuDiode contains two NextGen firewalls, one for each network. The NextGen firewall combines simple management with a high level security and a powerful working due to the security principle: “Everything not explicitly allowed is strictly forbidden.” The responsibility of data control is thus transferred from the employee to the administrator.
CompuDiode is very suitable for industrial environments, because it is shockproof, works at temperatures between -20° and +55° Celsius, doesn’t contain any fans and has a long life time.