What does the Bell-LaPadula model primarily focus on?

The Bell-LaPadula model primarily focuses on the confidentiality of stored information. This security model was developed to address the needs of protecting classified information and ensuring that sensitive data is not accessed by unauthorized users.

In the Bell-LaPadula model, there are two key principles: the simple security property, which states that a subject at a lower security level cannot read data at a higher security level (no read up), and the star property, which states that a subject at a higher security level cannot write data to a lower security level (no write down). These principles are designed to maintain the confidentiality of information by preventing unauthorized access and ensuring that information flows in a controlled manner based on the security clearance of the users.

While access control permissions and user authorization levels are relevant concepts in information security, they are broader terms that encompass various security models and frameworks, not specifically the focus of the Bell-LaPadula model. Integrity, while important, is more closely related to other models like the Biba model, which emphasizes maintaining the accuracy and trustworthiness of data. Therefore, the Bell-LaPadula model's singular emphasis on confidentiality sets it apart as the correct answer.