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Identification and Authentication (I&A)
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After applying this solution, the next step is typically to decide what type of I&A to use. If you have made a decision to use only automated I&A, you can apply AUTOMATED I&A DESIGN ALTERNATIVES (207) .
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Automated I&A Design Alternatives 207
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7.2 Automated I&A Design Alternatives
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This pattern describes alternative techniques for automated I&A, as opposed to procedural or physical I&A. It helps you to select an appropriate I&A strategy that consists of a single technique, or a combination of techniques, to satisfy I&A requirements. Techniques considered include password, biometrics, hardware token, PKI, and I&A of unregistered users.
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Decision Tradeoffs for Automated I&A [HHR+02].
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Indiana Jones, a museum employee, needs to gain access to the museum intranet while collecting artifacts for the museum from around the world. He wants to check his e-mail abroad and also access the museum s database to evaluate a found artifact. From Jones perspective, the most important requirements for this I&A service are to support I&A from remote locations and to be easy to use. From the perspective of Samuel the museum systems engineer, the most important requirements for this I&A service are to have high accuracy, especially to reject attempts by non-employees to gain access to the intranet, and to limit I&A overhead. Samuel and his systems engineering group have used I&A REQUIREMENTS (192) to define all four of these intranet I&A requirements as high priority. Now Ivan the intranet architect needs to select an I&A service to satisfy these requirements. The choices available to Ivan are many. They include identifier and password, PKI certificates, multiple biometrics options, and a hardware token with a one-time password. How can Ivan choose among the alternatives
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The person applying this pattern understands the requirements for I&A, along with their relative importance for example, from the results of applying I&A REQUIREMENTS (192). A decision has been made to use automated I&A1.
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In the remainder of this pattern, the term I&A is intended to mean automated I&A, as opposed to physical or procedural I&A, such as showing a badge to a guard at the front door.
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Identification and Authentication (I&A)
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I&A is a common need for systems and enterprises. Multiple techniques exist for achieving I&A. Different techniques emphasize different types of authenticators. No one technique is the best in all situations. Trade-offs and weighting are typically necessary, because in general the techniques have differing and often complementary strengths and weaknesses. For example, PKI provides high accuracy, but has relatively high infrastructure and cost impact, while passwords provide less accuracy, but have low infrastructure and cost impact. In addition, certain combinations of techniques can produce an I&A strategy that in some circumstances satisfies requirements better than any of the individual techniques. For example, a combination of password and hardware token is typically stronger than either individual technique, because each compensates for a weakness of the other. A common perspective for comparing and combining techniques is the following categorization:
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Something you know, for example a password. Something you have, for example a hardware token. Something you are, for example a biometric characteristic such as an iris image. Recently a fourth category has emerged: where you are, for example, derived from either your IP address or through the use of GPS, which is now included in some cell phones and PDAs. This is an additional kind of information available for authentication.
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An I&A strategy may be influenced by the selection of strategies for other I&A domains within an enterprise. The enterprise may find it more efficient in terms of cost, training, and maintenance if all I&A domains that have similar requirements use the same strategy. For example, the enterprise may decide that the I&A used in granting out-of-hours physical access to all enterprise facilities throughout the country should use the same technique, such as biometrics. Using a single technique for I&A in an organization is attractive, for example for achieving single sign-on (SSO). On the other hand, using a single technique is also dangerous, because it is a single point of failure, thus violating the defence in depth principle (see 15). For example, if you are an imposter and your identity claim is accepted, you may be given access to multiple critical resources. How can a strategy for I&A be selected that satisfies I&A requirements Based on the foregoing discussion, we can summarize the forces that influence selection of a strategy that balances techniques to satisfy I&A requirements:
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Some techniques satisfy some I&A requirements better than others. In many cases certain combinations of I&A techniques can satisfy requirements better than any individual technique. A common strategy is to combine