What is bell-lapadula model?

The Bell-LaPadula model is a security framework designed for maintaining data confidentiality, primarily in military and government applications. It uses a set of access control rules based on security labels assigned to subjects (users) and objects (data), enforcing two main properties: the "simple security property," which prohibits users from reading data at a higher security level (no read up), and the "star property," which prevents users from writing data to a lower security level (no write down). This model helps prevent unauthorized access and data leakage by ensuring that sensitive information remains within appropriate security boundaries.