Securing the U.S. Defense Information Infrastructure: A Proposed Approach

By Robert H. Anderson; Phillip M. Feldman Scott et al. | Go to book overview

Chapter Five
IDENTIFYING SECURITY TECHNIQUES

In Chapter Three we introduced a set of 20 vulnerability attributes for information systems and their components. Chapter Four pre/ sented 13 categories of information system security techniques. We now provide a tool that should help military units and other organi/ zations execute step 4 of the MEII process—identifying security techniques that can mitigate each one of an information system's vulnerabilities. We also discuss factors that should be taken into ac/ count in refining the set of security techniques so identified and ways to accomplish step 6 of the MEII process—testing the implemented techniques. The chapter concludes with some observations on the trade-offs that must be made between security and other objectives.

We do not discuss step 5—applying the security techniques—be/ cause it cannot easily be treated outside the context of implementa/ tion in specific systems. Thus, no generic guidance can be given. We note, however, that units cannot implement all applicable security techniques to reduce their assessed system vulnerabilities. Some techniques address singularities outside a unit's purview or weak/ nesses in COTS software. In such cases, units will need to communi/ cate their concerns to the appropriate authorities, reduce depen/ dencies on vulnerable elements where possible, and identify workarounds to use in the event of attack.


MATCHING SECURITY TECHNIQUES TO VULNERABILITIES

The matrix shown in Figure 5.1 arrays the security technique cate/ gories against the vulnerability attributes. Each cell is color-coded to

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