Abstract
Defense-in-Depth (DID) is a crucial concept for the cyber security of computer systems. The strategies for DID have been suggested in many researches. In this work, a DID strategy is proposed for smart service servers in more concrete manner. We tried to find out the special features in applying DID concept to nuclear industry cyber security. To do this, we assigned cyber security levels to a typical digital I&C system using the DID concept in nuclear industry cyber security. Based on the lessons learned from the security level assignment case study, we could set up a DID strategy for smart service servers. The main strategy for smart service server security is an n-tier and ‘thin’ server architecture which is based on the DID concept. This work is expected to be very useful in applying the concept of DID to smart service industry with respect to cyber security.
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