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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Florinda

33 minutes 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

12 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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Nieves

1 days ago

A) Cipher feedback mode

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Gene

29 days ago

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

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Nickolas

1 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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Freida

2 days ago

C) Output feedback mode

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Armando

15 days ago

B) Cipher block chaining mode

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Peter

18 days ago

A) Cipher feedback mode

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Clay

1 months ago

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

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Jose

1 months ago

I think the answer is D) Electronic codebook mode.

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