Answer the below questions. The answer to each question should be more than 150 words.
Question: What is the OSI security architecture?
Question: What is the difference between passive and active security threats?
Question: List and briefly define categories of passive and active security attacks.
Question: List and briefly define categories of security services.
Question: List and briefly define categories of security mechanisms.
Question: List and briefly define the fundamental security design principles.
Question: Explain the difference between an attack surface and an attack tree.
Question: What are the essential ingredients of a symmetric cipher?
Question: What are the two basic functions used in encryption algorithms?
Question: How many keys are required for two people to communicate via a symmetric cipher?
Question: What is the difference between a block cipher and a stream cipher?
Question: What are the two general approaches to attacking a cipher?
Question: Why do some block cipher modes of operation only use encryption while others use both encryption and decryption?
Question: What is triple encryption?
Question: Why is the middle portion of 3DES a decryption rather than an encryption?