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Quiz về Mã hóa

Authored by Văn Thịnh

Financial Education

University

Used 1+ times

Quiz về Mã hóa
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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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