Clark-Wilson Model

5 minutes 5 Questions

Developed by David Clark and David Wilson in 1987, the Clark-Wilson Model is designed for commercial applications and emphasizes data integrity and separation of duties. The model enforces access control through well-formed transaction rules and certification rules. A well-formed transaction must m…

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CISSP - Clark-Wilson Model Example Questions

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Question 1

A software company releases a new accounting application that implements the Clark-Wilson Model's data integrity model. Which of the following best represents a correct implementation?

Conducting regular security audits Implementing encryption on all transactions Using password complexity and account lockout policies Establishing transformation procedures and separation of duties

Correct Answer: Establishing transformation procedures and separation of duties

The Clark-Wilson Model emphasizes well-formed transactions and separation of duties to ensure integrity. Encryption, security audits, password complexity, account lockout policies, and biometric authentication are important security measures but not specific to Clark-Wilson Model.

Question 2

A bank has recently implemented the Clark-Wilson Model to ensure data integrity. What should be the responsible parties for enforcing the enforcement, certification, and conformance rules?

Integrity verification procedure and integrity enforcement procedure Internal audit and external audit Control objectives definition and control activities Incident response plan and continuous monitoring plan

Correct Answer: Integrity verification procedure and integrity enforcement procedure

The Clark-Wilson model is an integrity model in information security that is designed to prevent unauthorized users from making modifications and to ensure that authorized users make only proper modifications. It accomplishes this by requiring authenticated users to access data through well-defined transactions and routines, which are referred to as transformation procedures (TPs). In the context of the Clark-Wilson model, the correct answer to the question about who should be responsible for enforcing the enforcement, certification, and conformance rules is: Integrity verification procedure and integrity enforcement procedure Here’s why: Integrity Verification Procedure (IVP): This set of procedures ensures that all data meet the integrity constraints of the system. IVPs are used to check the data to confirm that it is in a valid state both before and after transformation procedures are applied. Integrity Enforcement Procedure (IEP): This refers to the mechanisms that enforce the well-formed transactions. IEPs ensure that only valid transactions (that adhere to the rules defined by the model) are executed, thus maintaining the integrity of the data as specified by the certification rules. These two procedures work together within the Clark-Wilson model to ensure that the system maintains data integrity by controlling how data is accessed and manipulated, thereby enforcing the model’s certification and conformance rules.

Question 3

A company wants to ensure that data integrity is maintained through the TCB system in Clark-Wilson Model. Which one of the following elements is crucial for that?

Well-formed transaction Bell-Lapadula Model Continuous monitoring Access control matrices

Correct Answer: Well-formed transaction

In the Clark-Wilson Model, Well-formed transaction is the mechanism for ensuring data integrity. Access control matrices, Bell-Lapadula Model, continuous monitoring, availability checks, and intrusion detection are not primary elements of Clark-Wilson Model to ensure data integrity.

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