Chapter 9.6, Problem 47E

a company, the lattice model of information flow is used to control sensitive information with security classes represented by ordered pairs(A, C).HereAis an authority level, which may be nonproprietary (0), proprietary (1), restricted (2), or registered (3). A categoryCisa subset of the set of all projects{Cheetah, Impala, Puma}.(Names of animals are often used as code names for projects in companies.)

a) Is information permitted to flow from(Proprietary, {Cheetah, Puma})into(Restricted, {Puma})?

b) Is information permitted to flow from(Restricted, {Cheetah})into(Registered, {Cheetah, Impala})?

c) Into which classes is information from(Proprietary, {Cheetah, Puma})permitted to flow?

d) From which classes is information permitted to flow into the security class(Restricted, {Impala, Puma})?