2.1 What are the essential ingredients of a symmetric cipher?2.2 What are the two basic functions used in encryption algorithms?2.3 How many keys are required for two people to communicate via a symmetric cipher?2.4 What is the difference between a block cipher and a stream cipher?2.5 What are the two general approaches to attacking a cipher?2.6 Why do some block cipher modes of operation only use encryption while others use both encryption and decryption?2.7 What is triple encryption?2.8 Why is the middle portion of 3DES a decryption rather than an encryption?
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