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Our medieval city is concerned about foreigners entering through its gate. Merchants are welcome, but burglars and thieves shouldn t be let in by the guards. Peasants looking for work in one of the city s workshops are allowed in depending on the demand of the guilds. On the other hand, once a person has entered the city, it is hard for the city dwellers to tell who that person is if they are not a wellknown city dweller. Even the night watchman patrolling the city s streets has a hard time knowing how to deal with a stranger. A merchant should be welcomed and protected, while someone else lingering in the streets at night might need to be dealt with. The problem of city inhabitants and the night watchman is that they do not have equivalent resources to the guards at the city gate, to interrogate and investigate people and check their identity. In addition, it would be annoying to visitors that are welcome if they had to answer the same questions over and over again, such as who they are, where they are going, and what their business is in the city. The mayor summons the city council to discover a way to keep the city secure while making the city a welcoming as possible for merchants and other guests. Another requirement that comes up at the council meeting is that the city officials would also like to know when a visitor has left.

6.9 By using a slow shutter speed and timing it just right, I was able to capture these palm trees during a city reworks celebration. Fireworks can also provide a one-of-a-kind backdrop for musicians and festival performers. Taken at ISO 400, f/8, 1.6 second with a 6.1mm lens setting.

Your system is shared by multiple users and system components need a way to share (security) data associated with a user. For example, you have already applied CHECK POINT (287).

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FIGURE 7.14 By clicking on the small triangle in the trendline tool you can access the features of the tool.

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Systems shared by multiple users, either via terminals or via a network, have become commonplace Instead of single-user non-networked systems like the now almost extinct DOS PCs, shared or networked systems need to account for a user s actions and ensure users only have access to areas for which they have privileges A user therefore needs to be identified and authenticated by the system, as described in 7, Identification and Authentication (I&A) In addition, shared resources require controlling access to them, as described in 8, Access Control Models Different components acting on behalf of a user might need to know which user is activating them and what the user s permissions are Having every individual component or program within the system identifying, authenticating and authorizing users is annoying to both users and developers.

In addition, system components might call each other or work together, and thus need a way to share information about the user without compromising this global data to other users For example, when buying from a Web-based on-line store, you want to put items in a shopping cart that is associated with you Later, the check-out process requires you to approve your credit card information and delivery address The underlying protocol (HTTP) does not provide a context for multi-step interaction because it is stateless Accordingly, the on-line store s software needs to associate every click you make in your browser with your identity, your shopping basket contents, and your billing information.

Second-curtain sync, also known as Rear-curtain sync, allows the ash to re at the end of the exposure. When photographing moving subjects, if the ash res at the beginning of the exposure, the ambient light being recorded causes a blur in front of the subject, which can look unnatural. Using 2nd curtain sync causes the motion blur to lead up to or follow the subject. Second-curtain sync is most effective when using a long shutter speed and shooting against a dark background.

In addition, you want the system to forget your credentials after the transaction is complete, either by an explicit sign-off mechanism or by a time-out after no interaction by you, thereby ensuring that forgetting to sign off will not compromise your private data such as your credit card account number How do you provide easy access for system components to the security properties and other values related with the current user, without requiring them to identify and authenticate every time they interact with the system or an individual component The solution to this problem must resolve the following forces:.

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