Need to answer the following questions, with references links

What are the essential ingredients of a symmetric cipher?

What are the two basic functions used in encryption algorithms?

How many keys are required for two people to communicate via a symmetric cipher?

What is the difference between a block cipher and a stream cipher?

What are the two general approaches to attacking a cipher?

Why do some block cipher modes of operation only use encryption while others use both encryption and decryption?

What is triple encryption?

Why is the middle portion of 3DES a decryption rather than an encryption?

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