Here are the answers to your cryptography questions:
Question 1: The practice of encoding information so only authorized people can read it.
Question 2: key
Question 3: True
Question 4: 2 inputs map to the same output
Question 5: A and B
Question 6: Cryptanalysis
Question 7: cryptography
Question 8: Digest
Question 9: True
Question 10: False
Feel free to ask if you have any more questions or need further clarification!