Which of the following is considered the first security mode

Which of the following is considered the first security model to be based on confidentiality?

A. Biba

B. Bell-LaPadula

C. Graham-Denning

D. Clark-Wilson

Solution

Bell- LaPadul is the first security model to be based on confidentiality.This model gurantees confidentiaity and in order to gurantee this it can even sacrifice other parameters.It has two rules defined:

1) No Read Up or which is also called Simple Security Property

2) No Write down or which is also called *-Property.

The read rule says that a subject with lable x_a can read only information in object with x_a wherexa denominates x_b.

The write rule says a subject with lable x_a can write information in object with x_b wherexa denominates x_{a ..}