The University of SydneyPage 44Biba vs Bell-La Padulavs Clark-Wilson–Bell-La Padula:–Prevent the leaking of higher confidential information to a lower classified file –No read Up and No write Down–Biba:–Prevent the flow of non trusted information into a file with a higher integrity classification–No read Down and No write UP–Clark-Wilson:–Protect the integrity of data and ensure properly formatted transactions take place.–Authorized programs, separation of duties and auditing.–All models can have implementation challenges.