Exam Code: 250-551
Exam Name: Administration of Symantec Endpoint Detection and Response 4.1
Certification Provider: Symantec
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NEW QUESTION: 1
Which of the following was the first mathematical model of a multilevel security policy used to define the concepts of a security state and mode of access, and to outline rules of access?
A. State machine
This is a formal definition of the Bell-LaPadula model, which was created and implemented to protect confidential government and military information.
In the 1970s, the U.S. military used time-sharing mainframe systems and was concerned about the security of these systems and leakage of classified information. The Bell-LaPadula model was developed to address these concerns.
It was the first mathematical model of a multilevel security policy used to define the concept of a secure state machine and modes of access, and outlined rules of access. Its development was funded by the U.S. government to provide a framework for computer systems that would be used to store and process sensitive information.
The model's main goal was to prevent secret information from being accessed in an unauthorized manner. A system that employs the Bell-LaPadula model is called a multilevel security system because users with different clearances use the system , and the system processes data at different classification levels.
The level at which information is classified determines the handling procedures that should be used. The Bell-LaPadula model is a state machine model that enforces the confidentiality aspects of access control. A matrix and security levels are used to determine if subjects can access different objects. The subject's clearance is compared to the object's classification and then specific rules are applied to control how subject-to-object interactions can take place.
The following answers are incorrect:
Biba - The Biba model was developed after the Bell -LaPadula model. It is a state machine model
similar to the Bell-LaPadula model. Biba addresses the integrity of data within applications. The
Bell-LaPadula model uses a lattice of security levels (top secret, secret, sensitive, and so on).
These security levels were developed mainly to ensure that sensitive data were only available to
authorized individuals. The Biba model is not concerned with security levels and confidentiality, so
it does not base access decisions upon this type of lattice. Instead, the Biba model uses a lattice
of integrity levels.
Clark-Wilson - When an application uses the Clark -Wilson model, it separates data into one
subset that needs to be highly protected, which is referred to as a constrained data item (CDI),
and another subset that does not require a high level of protection, which is called an
unconstrained data item (UDI). Users cannot modify critical data (CDI) directly. Instead, the
subject (user) must be authenticated to a piece of software, and the software procedures (TPs) will
carry out the operations on behalf of the user. For example, when Kathy needs to update
information held within her company's database, she will not be allowed to do so without a piece of
software controlling these activities. First, Kathy must authenticate to a program, which is acting as
a front end for the database, and then the program will control what Kathy can and cannot do to
the information in the database. This is referred to as access triple: subject (user), program (TP),
and object (CDI). A user cannot modify CDI without using a TP.
State machine - In state machine models, to verify the security of a system, the state is used ,
which means that all current permissions and all current instances of subjects accessing objects
must be captured. Maintaining the state of a system deals with each subject's association with
objects. If the subjects can access objects only by means that are concurrent with the security
policy, the system is secure. A state of a system is a snapshot of a system at one moment of time.
Many activities can alter this state, which are referred to as state transitions. The developers of an
operating system that will implement the state machine model need to look at all the different state
transitions that are possible and assess whether a system that starts up in a secure state can be
put into an insecure state by any of these events. If all of the activities that are allowed to happen
in the system do not compromise the system and put it into an insecure state, then the system
executes a secure state machine model.
The following reference(s) were/was used to create this question:
Harris, Shon (2012-10-18). CISSP All-in-One Exam Guide, 6th Edition (p. 369, 372-374, 367).
McGraw-Hill . Kindle Edition.