Certified Information Systems Security Professional (CISSP) Practice Exam 2025 – All-in-One Guide to Mastering Your Certification!

The phrase "no write-up" refers specifically to a principle within the Biba integrity model, which is designed to prevent the alteration of information by users at lower security levels. The Biba model enforces integrity by categorizing information and users, such that users with lower integrity levels are unable to write data to higher integrity levels, thereby preventing potentially corrupt data from being written to a more trusted level. This ensures that only trusted users can modify high-integrity data.

This aspect of the Biba property is crucial for maintaining the integrity of data in sensitive environments, as it mitigates risks of data modification by users who lack the necessary trust or authority. The "no write-up" rule is a foundational part of this model, as it underlines the importance of ensuring that only appropriately ranked users can affect the state of more secure or sensitive information.

The other properties mentioned, such as those in the Bell-LaPadula model, which focuses on confidentiality, and the Clark-Wilson model, which emphasizes well-formed transactions and separation of duties, do not align with the specific integrity-centric rule exemplified by "no write-up." Access Control refers more broadly to the security mechanisms controlling user permissions and is not specific to integrity principles.