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All user locations are known. All I&A services will have fixed locations. Museum users will not be required to perform multiple log-ons. Training will be provided to ensure workstations are logged off. The museum does not consider this a significant requirement. The museum considers this a moderate concern related to staffing. Statutes and policy do mandate this requirement for the museum.
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Minimize time and effort to use. The I&A service shall be easy to use.
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Frequency of use
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Minimize risks to user safety. The I&A service shall provide adequate safety.
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Relevant statutes and enterprise policy
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Vulnerability of enterprise to negative publicity
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Table 7.3
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I&A Requirements 203
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Resolving requirements for museum information system I&A (continued)
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GENERIC/SPECIFIC REQUIREMENT Minimize costs of per-user setup. The I&A service set-up cost per person shall be as small as possible, and in any case shall be less than $50 per person.
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FACTOR Number of users in general terms
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IMPORTANCE FOR MUSEUM The museum s user base will be restricted to identified and authenticated users. Costs for I&A will be per workstation.
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The museum considers this a moderate concern as the rate of staff turnover is not high. As noted, the museum intends to provide user training to reduce costs. The museum considers this requirement extremely important. The I&A for this museum wing must be able to interface with existing components from the parent enterprise. As above, museum costs will be per workstation, the same as the parent enterprise. Any future infrastructure changes will occur under the parent enterprise funding profile. User training will be provided.
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Minimize changes needed to existing infrastructure. The I&A service shall be able to interface with existing components from the parent enterprise.
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Number of connection points
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Predicted restructuring of existing infrastructure
Minimize costs of maintenance, management, and overhead. The I&A service shall be cost effective with respect to maintenance, management, and overhead.
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The museum considers this a moderate concern, as the rate of staff turnover is not high.
204 7
Identification and Authentication (I&A)
Table 7.3 Resolving requirements for museum information system I&A (continued)
GENERIC/SPECIFIC REQUIREMENT Protect I&A assets The I&A service shall protect its security assets, such as passwords. Cost of I&A service being unavailable
FACTOR Cost of authenticator theft
IMPORTANCE FOR MUSEUM The museum considers this a very important requirement, since it could put physical assets at risk.
The museum will need to address multiple back-up plans for loss of I&A service.
Samuel and Edward determine that the most important I&A requirements for the museum are: 1. Accurately detect imposters 2. Minimize risks to user safety 3. Minimize changes needed to existing infrastructure 4. Protect I&A assets
Known Uses
The general I&A requirements and the process of specifying I&A requirements described in this pattern represent a consolidation of MITRE Corporation s experience in working with multiple customers over several decades. The approach is generally used informally by those customers, as opposed to being codified or published. However, some discussions of I&A requirements exist. Examples include:
[OMB2003] is a US government policy for electronic authentication of individuals participating in on-line transactions. It discusses some of the non-functional requirements identified in this pattern, such as cost and user burden. [NIST2004] provides technical guidance for this policy. [ISO15408] is an international standard that defines evaluation criteria for information technology security. It includes a class or family of criteria that address the requirements for functions to establish and verify a claimed user identity. [SEI2004] is a risk-based technique to elicit authentication requirements for electronic transactions. It includes the process of defining context, scope, and nonfunctional I&A requirements. [Firesmith2003] describes functional I&A requirements (false positives and false negatives), and discusses I&A domains in terms of requirements scope.
I&A Requirements 205
Consequences
You may expect the following benefits from applying this pattern.
The pattern fosters explicit definition of I&A domains and a clear connection of requirements to I&A domains. This increases understanding of the full set of domains that are involved in I&A and understanding of the scope of each set of requirements. It facilitates conscious selection of I&A requirements, so that decisions about selecting I&A mechanisms have a clear basis, rather than occurring in a vacuum. It promotes explicit analysis of trade-offs that encourages balancing and prioritizing of conflicting requirements. It helps avoid stronger than necessary I&A, which makes it difficult for valid users, and at the same time it helps to avoid weaker than necessary I&A, which makes it easy for imposters to defeat and therefore provide inadequate protection. It results in documentation of I&A requirements that communicates to all interested parties, and also provides information for security audits.
The potential liabilities of applying this pattern are:
It requires an investment of resources to apply the pattern, including time to analyze domains and I&A needs. In some cases the cost of applying the pattern may exceed its benefits. It poses a danger of over-engineering and complexity creep, if stakeholders are offered too many options. You can mitigate this by using the requirements only as guidelines for analysis, or by selecting parts of the pattern that give the most help. The formal selection process may be too long and costly and produce too much overhead. You can mitigate this in the same way as noted above. Specific circumstances might not be covered by generic I&A requirements. You can mitigate this by adding specific requirements and including them in the trade-offs. Documentation of requirements implies that they must be maintained as they change over time. You can mitigate this by keeping the requirements in a form that is easy to update, integrated with other system documentation. Perception of I&A requirements can differ throughout an organization. This may make it difficult to reach agreement on priorities between requirements. On the other hand, bringing such disagreements to the surface may be a benefit of the pattern, because then they can be properly discussed and resolved.