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Welcome to the Advanced Encryption Algorithm MCQs Page

Dive deep into the fascinating world of Advanced Encryption Algorithm with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Advanced Encryption Algorithm, a crucial aspect of Cryptography and Network Security. In this section, you will encounter a diverse range of MCQs that cover various aspects of Advanced Encryption Algorithm, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Cryptography and Network Security.

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Check out the MCQs below to embark on an enriching journey through Advanced Encryption Algorithm. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Cryptography and Network Security.

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Advanced Encryption Algorithm MCQs | Page 4 of 6

Q31.
Which one of the following modes of operation in DES is used for operating short data?
Discuss
Answer: (c).Electronic code book (ECB)
Q32.
Which of the following is false for ECB mode of operation?

i) The Plain text is broken into blocks of size 128 bytes
ii) Blocks can be swapped, repeated, replaced without recipient noticing
iii) Good for short data
iv) Encryption of each block is done separately using a randomly generated key for each block
Discuss
Answer: (c).i) and iv)
Q33.
Which of the following statements are true ?

i) In the CBC mode, the plaintext block is XORed with previous ciphertext block before encryption
ii) The CTR mode does not require an Initialization Vector
iii) The last block in the CBC mode uses an Initialization Vector
iv) In CBC mode repetitions in plaintext do not show up in ciphertext
Discuss
Answer: (d).i) ii) and iv)
Q34.
There is a dependency on the previous ‘s’ bits in every stage in CFB mode. Here ‘s’ can range from ___
Discuss
Answer: (b).8-32 bits
Q35.
Which of the following can be classified under advantages and disadvantages of OFB mode?

i) Transmission errors
ii) A bit error in a ciphertext segment
iii) Cannot recover from lost ciphertext segments
iv) Ciphertext or segment loss
Discuss
Answer: (d).Advantages: i); ii) Disadvantages: iii) iv)
Q36.
In OFB Transmission errors do not propagate: only the current ciphertext is affected, since keys are generated “locally”.
Discuss
Answer: (a).True
Q37.
Which of the following modes does not implement chaining or “dependency on previous stage computations”?
Discuss
Answer: (a).CTR, ECB
Q38.
The counter value in CTR modes repeats are a regular interval.
Discuss
Answer: (b).False
Q39.
Which mode of operation has the worst “error propagation” among the following?
Discuss
Answer: (d).ECB
Q40.
Which block mode limits the maximum throughput of the algorithm to the reciprocal of the time for one execution?
Discuss
Answer: (b).CTR
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