Enterprise Security and Risk Management in .NET

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Enterprise Security and Risk Management
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From a holistic perspective, ensure that the various approaches for asset types complement and reinforce each other, rather than work against each other. The process of defining approaches is typically performed by an enterprise architect or strategic planner. The first step is to collect all the necessary information, including asset types and their security needs. Next, information on risk criteria that influence approaches is either collected or generated. Finally, approaches are selected and integrated.
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Structure
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Table 6.25 shows elements of the structure of this solution. Participating elements include humans involved in defining the solution for a specific situation. Participants also include primary elements of the process of defining a solution: security needs, security approaches, and selection criteria. More details of these three primary elements are also given in the table. The Implementation section gives additional common examples of selection criteria. Multiple criteria apply to each security approach. More than one approach can be selected for each need.
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The process introduced in the Solution section is illustrated in the next figure. The process comprises three basic steps: collect information, identify security risk criteria, and determine security approaches for each asset type. The second step varies depending on whether sufficient risk information is available to understand the risk
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Table 6.25
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Table: elements of selecting enterprise security approaches
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SECURITY APPROACH Prevention Detection Response
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PARTICIPATING ELEMENT Business planner/ controller Enterprise architect Enterprise security officer Asset Security need Security approach Selection criterion
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SECURITY NEED Confidentiality Integrity Availability Accountability
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SELECTION CRITERION Assets are irreplaceable Asset loss prevents operations of critical business processes Accountability is needed in case of legal ramifications Assets must be repaired/ restored as soon as detection occurs (see implementation section)
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Enterprise Security Approaches 151
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criteria that affect the security approach. If it is not available, some qualitative level of criteria must be developed.
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Collect inputs Detailed risk information: Develop qualitative risk criteria Unavailable available Use detailed risk criteria
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Incident analysis and feedback
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Determine approaches for each asset type
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The process for selecting security approaches
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The figure also shows an analysis and feedback process. Decisions must be revisited, because the world changes continuously. The figure shows feedback to the collect inputs step, but feedback can go to any of the steps. In addition, if circumstances change sufficiently, feedback can extend beyond the scope of this pattern, to re-apply previous patterns such as RISK DETERMINATION (137).
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Implementation
This section first provides further detail on the process, then presents criteria for selecting security approaches.
Process guidelines
1. Collect necessary input information:
Critical enterprise asset types Basic security needs or properties for each asset type Specific security risks for each asset type
Note that asset types and basic security needs might be obtained as a result of applying SECURITY NEEDS IDENTIFICATION FOR ENTERPRISE ASSETS (89). Similarly, specific security risk information obtained as a result of applying RISK DETERMINATION (137).
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Enterprise Security and Risk Management
2. Identify security risk criteria that influence approaches:
If detailed risk information is available (for example, by applying RISK DETERMINATION (137)), those criteria can be used here to determine which approaches to use: prevention, detection, response (also planning, operational diligence). If such detailed risk information is not available, qualitative risk criteria such as criticality, ease of replacement, cost of replacement, and harm to reputation can be defined and used here.
3. Determine which approaches to use for each asset type. More details about the association of types of security needed, risk criteria, and approaches are provided below. 4. Revisit approaches for each asset type as circumstances change.
Decisions to revisit may be time-driven, for example annually. Decisions to revisit may be event-driven. Examples are: (1) an organization makes a significant change to its business process, (2) a major law is passed that requires specific security measures, (3) an organization experiences a major security incident that calls into question its security approaches.
Approach criteria
For each asset type, appropriate security approaches and their suggested business priorities are determined based on desired security properties and risks. If detailed risks are available, for example, from applying the risk management pattern system in this chapter, they can be used to determine approaches. If such risks are not known or available, the qualitative selection criteria shown in Tables 6.26 6.29 can be used. For example, Table 6.26 would be used to help determine approaches. If accountability is needed for an asset type due to legal ramifications, then detection is an indicated security approach with a high priority. In using the above tables, it is important to understand that the information is generated from an overall organization perspective. In addition, the tables are not intended to cover all situations for a given organization. The example resolved in the next section will illustrate both of these points. The focus on security approaches is typically documented as part of a security concept of operations. A security concept of operations presents approaches for addressing security properties and how the approaches work together to address security across the organization. The result should balance prevention, detection, and response into an appropriately layered set of defences. Balance is needed among layered asset protections, such as entrances to museum spaces and gem display cases. Balance is also needed for the focus on approaches, such as prevention versus detection and response.