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Essential ingredients of a symmetric cipher

Read the document Lecture 1.1 Cryptographic Tools CIS 3360 by Prof. Luis Guadalupe
Asnwer the following questions:
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?

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