1. Which of the following statements are incorrect? A. Cryptographic systems tend to involve both an algorithm and a secret value. B. To secure systems, it is more efficient to update algorithms than updating keys. C. Often a scheme can be made more secure by making the key longer. D. We can always change the key length to better secure systems, no matter using which cryptographic algorithms. E. In a secret-key cryptosystem, secret keys can be used for both encryption and decryption. 2. Which of the following statements are incorrect about a cryptographical hash function? A. The input size can be arbitrary and the output size is fixed B. Given the input, the output should be efficiently derived. C. Given the output, the input can be also derived efficiently D. In the cryptocurrency systems, it has properties collision-resistant, hiding, and puzzle friendly.
1. Which of the following statements are incorrect?
A. Cryptographic systems tend to involve both an
B. To secure systems, it is more efficient to update algorithms than updating keys.
C. Often a scheme can be made more secure by making the key longer.
D. We can always change the key length to better secure systems, no matter using which cryptographic algorithms.
E. In a secret-key cryptosystem, secret keys can be used for both encryption and decryption.
2. Which of the following statements are incorrect about a cryptographical hash function?
A. The input size can be arbitrary and the output size is fixed
B. Given the input, the output should be efficiently derived.
C. Given the output, the input can be also derived efficiently
D. In the cryptocurrency systems, it has properties collision-resistant, hiding, and puzzle friendly.
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