Consider a Biba model (more precisely one of Lipners Integrity Models) with the following characteristics:

Integrity levels: SP (system program) > OP (operational) > SL (system low)

Categories: SD (system development), PC (production)

A. Draw the full Lattice.

B. Answer the following question if the strict BIBA rules are applied. Suppose Alice at the highest point of the lattice creates a program Alice_P1, input data Alice_ID_1 and output data Alice_OD_1, Bob at the (OP, SD) level creates Bob_P1, Bob_ID1 and Bob_OD1. Cindy at the (SL, PC) level creates a program Cindy_P1, input data Cindy_ID1 and output data Cindy_OD2.

Bob at the operational level wish to obtain Alices directory. What are his permissions (read, write or execute) for each of the following?

Alice_P1: Cindy_P1:

Alice_ID1: Cindy_ID1:

Alice_OD1: Cindy_OD1: