Free Trial

Safari Books Online is a digital library providing on-demand subscription access to thousands of learning resources.

  • Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint
Share this Page URL
Help

Chapter 4. Access Control > Access Control Models

Access Control Models

An access control model is a framework that dictates how subjects access objects. It uses access control technologies and security mechanisms to enforce the rules and objectives of the model. There are three main types of access control models: discretionary, mandatory, and nondiscretionary (also called role based). Each model type uses different methods to control how subjects access objects, and each has its own merits and limitations. The business and security goals of an organization will help prescribe what access control model it should use, along with the culture of the company and the habits of conducting business. Some companies use one model exclusively, whereas others combine them to be able to provide the necessary level of protection.

These models are built into the core or the kernel of the different operating systems and possibly their supporting applications. Every operating system has a security kernel that enforces a reference monitor concept, which differs depending upon the type of access control model embedded into the system. For every access attempt, before a subject can communicate with an object, the security kernel reviews the rules of the access control model to determine whether the request is allowed.


  

You are currently reading a PREVIEW of this book.

                                                                                                                    

Get instant access to over $1 million worth of books and videos.

  

Start a Free 10-Day Trial


  
  • Safari Books Online
  • Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint