The University of SydneyPage 41Biba Model–The Bell La Padulaequivalent for integrity–Two security properties –dual of BLP2. Integrity *-property: Subject S can write to object O only if Iois less than or equal to Is.•No Write UP–Does this makessense?–Yes, this preserves the integrity of higher levelinformation.–Biba also provide dynamic integrity levels.–Automatically adjust the integrity level of an entity if it has come into contact withlow-level information.