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service has responsibility. The access control service should be designed to enforce the required policies. Definition and selection of access control policies is a key element. In fact, access control is about defining policies for authorization and then enforcing these policies through specific mechanisms. For example, a fundamental policy is open versus closed systems. In an open system everything is allowed unless explicitly forbidden. In a closed system everything is forbidden unless explicitly allowed. Another set of fundamental policies is defined by the choices among the access control models discussed in 8: access matrix, role-based access control, multi-level control, and attribute-based control. Any access control system must implement one or more of these. At the most generic level, therefore, the requirement is that an access control service must support all desired authorization policies. At a more specific level, authorization policies are selected that the implementation must enforce.

Make the access control service flexible Authorization policy statements sometimes change. This requirement says that adaptation to those changes should be fast, easy, and reliable. That is, the access control service should accommodate policy changes without high cost, complex administration, or increased difficulty of validating that the access control service requirements accurately reflect the authorization policy statements. Access control also needs to be flexible, to accommodate legitimate operational changes or exceptions. For example, when the threat of terrorist attack is perceived to be high the organization may require stringent checks at facility entry points at the cost of substantial delays. Employees and customers may tolerate such delays for a week or two, but not for months. An opposite example is the case of a hospital, where, if a patient s life is at stake, blocking access to normally-protected patient data may be wholly unacceptable. The system should make some provision that allows access, such as emergency override. At the same time, to provide protection in such incidents, the access control service should record the emergency activity automatically. This will enable a forensic activity or an audit to determine the facts about the violation of normal access rules, and to determine their legitimacy. Another area of flexibility is granularity. An access control service must be able to support a policy that supports both fine-grained control, such as specific elements in a database, or coarse-grained control, such as a whole database or group of users. In addition, an access control service should be able to support conditional authorization, such as permitting access at certain times of the day but not at others.

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Fibonacci studies, highlights, and other items drawn with the tool bar. This item is similar to Hide Studies in the sense that you can temporarily clean up a chart of embellishments and just look at the prices. You can use Ctrl-D for the same results. 5. Hide Events: When checked, this will hide any corporate events, such as stock splits, dividends, conference calls, earnings announcements, and so on. You can use Ctrl-E for the same result.

In addition to the obvious option of reading the book from cover to cover, you can choose alternative paths though the book This book is divided in three parts The first part, which comprises s 1 through 3, provides relevant background information about security patterns If you are not familiar with patterns, read 1, The Pattern Approach, which contains a brief introduction to the ideas behind software patterns If you are not familiar with security, read 2, Security Foundations, which provides basic concepts and pointers to sources of detailed security knowledge Based on that, 3, Security Patterns, discusses the notion of security patterns The second part of the book, s 4 through 13, contains a catalog of selected security patterns that address different topics You can work through the catalog chapter by chapter to get an impression of typical security problems and proven solutions that occur at the different levels.

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