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and submerging themselves in new surroundings, cultures, and climates in pursuit of meaningful images that tell a story. Such is the life of a landscape, nature, or travel photographer who relishes getting out there and returning with images that shape public opinion, focus the world s attention on an urgent issue, or simply convey the beauty of the land. People with a creative eye and a passion for travelling gravitate naturally toward landscape, nature, and travel photography. Starting at an early age, many were probably exposed to the National Geographic magazine and the beautiful, well-crafted images of foreign cultures and land formations. At some point in the process, the nancial burden of extended travel becomes evident, and so photographers seek ways to share and license their images with agencies, magazines, and book publishers as a way to cover their travel expenses and create careers for themselves.

To determine the biometric mechanism that will best satisfy the biometric s purpose, you can compare the technique profiles with your results of applying I&A REQUIREMENTS (192) to find a mechanism that is most compatible with your specific requirements.

Asking a user for I&A over and over again is annoying, so the system needs a means of associating an action automatically with a user that was previously authenticated. After a long period of inactivity, the system needs to re-authenticate a user to prevent misuse and overhead. In other words, the system should automatically sign off inactive users.

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Introduce a session object that holds all user-relevant shared data. Security information related to the user, especially, is kept in the session object. In addition to the session object that holds the values, the system needs to associate every action a user makes with this session. This can be either implicitly, such as associating every action coming over the user s connection with the session, or explicitly with an identifier like a session cookie that is sent to a user s browser by an on-line store site. A system s CHECK POINT (287) is the usual place to instantiate the session object and set up its initial values. For systems with access control, the session object can be used to obtain access permissions at sign-on and cache them, to avoid multiple queries to an external database. In addition, the session object can provide a scratch-pad area to allow different system components to share arbitrary data about the user between different actions within a log-on period. For example, classic mainframe systems provide a so-called terminal control block that can be used by different interactive transaction programs to share data, such as the last values entered in a form. This allows otherwise independent transaction programs to be chained easily on behalf of the user. Web applications use cookies to share data for a given user. Often a MANAGER [Som98] is used to keep track of active session objects and controls their life cycle. This MANAGER can also be used to provide the mapping of external session identifiers, such as those stored in a session cookie, to the session object and its data. Furthermore, it can collect obsolete sessions that were abandoned by their users.

TABLE 7.1 (Continued)

The following diagram shows the component relationships assuming that there is a MANAGER. The CHECK POINT (287) uses the MANAGER to associate a Session object with the user. Later, the components accessed by the user rely on the associated Session object to access the user s access rights and further information. The Manager class uses the timestamp to keep track of stale session objects, and forces the user to re-authenticate if a session is either used for too long without authentication, or if it has not been used for a longer time.

6.11 The Intracoastal Waterway along the coast of North Carolina was the setting for this sunset shot. I purposely dialed in 2 on the Exposure Compensation dial to render these boat docks as silhouettes against the beautiful sky and water. Taken at ISO 100, f/8, 1/30 second with a 10.8mm lens setting.

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accesses User sign in do operation sign off sign in/off Check Point sign in sign off create session Component operation obtain session check rights Session user info rights for user * timestamp Manager create session manages dispose session look up session check time-outs

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