
Quiz về Mã hóa
Quiz
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Financial Education
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University
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Practice Problem
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Medium
Văn Thịnh
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104 questions
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1.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
What is the primary purpose of encryption?
To make communication faster
To hide the substance of a message
To enhance network bandwidth
To convert data into physical storage
2.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
Which term refers to a message in human-readable form before it is encrypted?
Ciphertext
Keytext
Cleartext
Encrypted message
3.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
What does the function D(K, C) represent in cryptography?
Encryption of plaintext using a key
Decryption of ciphertext using a key
Double encryption using two keys
Data compression
4.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
Which of the following is NOT a type of attack on a cryptosystem?
Ciphertext-only attack
Plaintext-injection attack
Known-plaintext attack
Chosen-plaintext attack
5.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
What is the key size used in the Data Encryption Standard (DES)?
128 bits
64 bits
56 bits
256 bits
6.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
Which of the following encryption modes treats the plaintext as a continuous stream of data?
Electronic codebook mode
Cipher feedback (CFB) mode
Block cipher mode
Triple DES mode
7.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
Which cryptographic technique involves using the same key for both encryption and decryption?
Public-key encryption
Asymmetric encryption
Symmetric encryption
Digital signatures
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