What are the two primary access modes of the Bell-LaPadula model and what do they restrict?

What will be an ideal response?

BLP access modes can be one of two types: simple security and the * (star) property.?Simple security (also called the read property) prohibits a subject of lower clearance from reading an object of higher classification, but allows a subject with a higher clearance level to read an object at a lower level (no read up).?The * property (the write property), on the other hand, prohibits a high-level subject from sending messages to a lower-level object. In short, subjects can read down and objects can write or append up (no write down).