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Types of magnetic cards used for I&A include ATM cards, debit cards, and employee badges. Most use PINs (personal identification numbers) to counter the problem of card theft. This pattern helps you to address the design issues involved in magnetic card I&A and to define a mechanism that will satisfy I&A requirements.

One-time password (OTP) tokens are designed to counter the problem of password theft by producing passwords dynamically that are then used only once. Often they are used in conjunction with a user ID and PIN. Examples include counter-based or event-based tokens in which a user prompts for the next OTP, and time-based tokens in which the token generates a new OTP periodically, such as every minute which must be time synchronized with a server/authenticator. Other variations are

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whites as gray and large expanses of black as gray. You can use Exposure Compensation to override the meter. For example, snow scenes usually require between +1 and +2 stops of compensation to render snow as white instead of dull gray. A scene with predominately dark tones might require 1 to 2 stops of compensation to get true dark renderings. Occasionally, you may notice that the camera consistently overexposes or underexposes images, and in those cases, compensation allows you to modify the exposure accordingly. (If underexposure or overexposure is a consistent problem, it s a good idea to have the camera checked by a reputable Canon repair facility.) Exposure compensation is useful in other scenarios as well, such as when you want to intentionally overexpose skin tones for a speci c rendering effect.

asynchronous, such as challenge-response password tokens. This pattern helps you to address the design issues involved in OTP token I&A and to define a mechanism that will satisfy I&A requirements.

4, the pin button is a small circle on the right side of the module s title bar When you put your mouse cursor on top of it, a tool tip will appear reminding you that clicking this will keep the module open If you click it, it will turn black (and the module will be pinned) Clicking it again turns it back to an empty circle (and the module will no longer be pinned open) In Figure 35, you can see there are four modules open at the same time: Quote, My Study Sets, Indices, and Quick Toggles Notice that the pinned-open modules have the solid black circle on the right part of their title bar Also note that the Quote module doesn t have such a circle The reason is that Quote has the special behavior of remaining open even when other modules are open.

The smart card token is typically a plastic card in which an integrated circuit chip is embedded, which gives it both data storage and computational capability. It has many potential uses, one of which is to authenticate the identity of the card holder. This pattern helps you to address the design issues involved in smart card I&A and to design a smart card that will satisfy I&A requirements.

In some cases a modest level of I&A is needed when a preceding registration step is not possible or not cost-effective. A common approach in these cases is to use functional information about the person, that is, information that was acquired in the normal course of business. Such information usually includes both public items, such as name or e-mail address, and private items or secrets, such as the individual s mother s maiden name. This pattern helps you to define the requirements for I&A when pre-registration is not used.

Most I&A approaches involve identifying and authenticating an actor against a previously-established known record. Determining how the known record is established is the function of actor registration. This pattern helps you to design a registration mechanism for an actor or user. The type of information recorded depends on the I&A mechanism used. For example, if you are using an ID and password mechanism, then you need to define a user account ID and establish a password. If you are using signature verification, you need to capture user signature samples. This pattern covers the more common types of I&A mechanisms, such as those identified in this book.

3.10 Snow-dominant scenes are a perfect example of when to use exposure compensation to counteract the camera s natural tendency to expose for middle gray. This image of Mt. Hood, Oregon was taken in Manual mode at ISO 80, f/4, 1/1000 second with a 9.8mm lens setting.

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