1. Which of the following statements about cryptographic hash functions is correct: A. Cryptographic hash functions are private. B. Cryptographic hash functions are one direction function. C. It is impossible to find the input of a cryptographic function given the input value. D. Puzzle friendly is a required property of cryptographic functions in all applications.
1. Which of the following statements about cryptographic hash functions is correct:
A. Cryptographic hash functions are private.
B. Cryptographic hash functions are one direction function.
C. It is impossible to find the input of a cryptographic function given the input value.
D. Puzzle friendly is a required property of cryptographic functions in all applications.
2. Which of the following statements about hash pointers is incorrect:
A. A hash pointer gives you a way to retrieve the information.
B. A hash pointer gives you a way to verify that the information hasn't been changed.
C. In the blockchain, if an attacker tampers a block without modifying other blocks, then we cannot detect the change.
D. In the blockchain, the head of the list is a regular hash‐pointer that points to the most recent data block.
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