Question: 1. What are cryptography and cryptanalysis? 2. What was the earliest reason for the use of cryptography? 3. What is a cryptographic key, and what

1. What are cryptography and cryptanalysis?

2. What was the earliest reason for the use of cryptography?

3. What is a cryptographic key, and what is it used for? What is a more formal name for a cryptographic key?

4. What are the three basic operations in cryptography?

5. What is a hash function, and what can it be used for?

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