Imagine a system that processes information. This information is classified in nature. When we say, its classified, it means that the information has been labeled according to the data classification scheme finalized by the organization. This scheme can be company specific, such as public, internal and confidential or military/government specific such as Confidential, Top Secret, Secret, Public. As a general user or a security professional, you would want that proper controls to be implemented and the system to be secure that processes such information. Imagine a scenario where such a malicious user tries to access this information. What clearance must this person have? Will he/she have access to all classified levels? Hey!!, stop imagining. Let’s discuss something else now. Hold on, I know, I had asked you to imagine the scenario above. But answers to all your questions would follow, so keep on reading further. We need to learn and understand a few terms before we are ready
