By Messaoud Benantar
No longer a lot to assert in this publication other than that i discovered it incomplete and missing in sensible approaches, extra studious than program orientated. i've got learn larger books at the topic just like the IAM luck information: quantity 1 which deals much more strategical info because it is extra of a consultant than a tutorial research.
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Additional info for Access Control Systems: Security, Identity Management and Trust Models
A security context may also anchor the user's roles and capabilities to access system and Thread Thread Thread A. Address space FIGURE B. 4 Anchoring computing tasks with security contexts The Security Context 19 network resources. Other non-persistent forms of identification such as an internally used unique identifier may also be part of the security context. The Flow of a Security Context Components of a system's or a network's TCB are responsible for the creation and lifecycle management of a security context.
The following practices are in common use: n Require a maximum lifetime for each password after which a password automatically expires; B Avoid recycling old passwords by maintaining the history of N previous passwords for each user; o Require a time limit that should pass before a password can be reused (a good measure against users changing passwords TV times just to reuse a recent password and thus defeat the practice of not reusing N previous passwords); a Old and new passwords must differ by at least a certain number of prescribed characters.
Access attempts to resources are automatically intercepted by the respective resource manger in order to decide whether to grant or deny access. Examples include database management systems such as IBM's DB2, transaction monitors, Web servers, and more recently Web application servers (WAS) such as IBM's Websphere as well as various network file systems. Advantages of this method include the ease of portability of such programming systems to different operating-system platforms as well as the transparency of access-control functionality to application developers.