ISC2 Exam ISSAP Topic 3 Question 97 Discussion

Actual exam question for ISC2's ISSAP exam

Question #: 97
Topic #: 3

Which of the following encryption modes can make protocols without integrity protection even more susceptible to replay attacks, since each block gets decrypted in exactly the same way?

ACipher feedback mode

BCipher block chaining mode

COutput feedback mode

DElectronic codebook mode

Show Suggested Answer

Suggested Answer: D

by Vannessa at Mar 06, 2025, 04:09 AM

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Lashawnda

8 days ago

Wait, is it me or does this question sound like it's straight out of a spy movie? I feel like I should be wearing a tuxedo while answering this.

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Earleen

10 days ago

D definitely seems like the right answer. I can't believe I almost fell for that tricky wording in the question!

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Florinda

17 days ago

Ugh, these encryption modes can be so confusing. I'm just hoping for a multiple-choice miracle on this one.

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Beckie

29 days ago

Haha, I bet the exam writers were just waiting to trick us with that one. Good thing I studied hard for this!

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Fanny

11 days ago

D) Electronic codebook mode

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Murray

14 days ago

C) Output feedback mode

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Paulina

16 days ago

B) Cipher block chaining mode

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Nieves

18 days ago

A) Cipher feedback mode

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Gene

2 months ago

I agree with Jose, Electronic codebook mode makes protocols more susceptible to replay attacks.

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Nickolas

2 months ago

I think the answer is D. Electronic codebook mode, since it encrypts each block independently, making it vulnerable to replay attacks.

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Tamie

10 days ago

D) Electronic codebook mode

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Freida

19 days ago

C) Output feedback mode

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Armando

1 months ago

B) Cipher block chaining mode

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Peter

1 months ago

A) Cipher feedback mode

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Clay

2 months ago

I disagree, I believe the correct answer is B) Cipher block chaining mode.

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Jose

2 months ago

I think the answer is D) Electronic codebook mode.

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