ISC2 ISSAP Exam - Topic 2 Question 9 Discussion

Actual exam question for ISC2's ISSAP exam

Question #: 9
Topic #: 2

Which of the following types of ciphers operates on a group of bits rather than an individual character or bit of a message?

ABlock cipher

BClassical cipher

CSubstitution cipher

DStream cipher

Show Suggested Answer

Suggested Answer: A

encryption process, a block cipher might take an n bit block of plaintext as input, and output a corresponding n bit block of the ciphertext. The

exact transformation is controlled using a secret key. While decrypting, the decryption algorithm takes the n bit block of the ciphertext

together with the secret key, and yields the original n bit block of the plaintext.

Answer options B, C, and D are incorrect. All these three types of ciphers operate on an individual character or bit of a message.

by Jaclyn at May 03, 2022, 03:07 PM

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Bobbie

4 months ago

Yup, block ciphers are the way to go for secure data!

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Shanda

4 months ago

Classical ciphers are just old-school, not block ciphers.

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Asha

4 months ago

Wait, I thought stream ciphers did that too?

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Julie

4 months ago

Totally agree, it's definitely block ciphers!

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Lorita

5 months ago

Block ciphers work on fixed-size groups of bits.

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Dannie

5 months ago

I have a vague memory of classical ciphers being more about letters and symbols, so I think they wouldn't be the answer here.

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Estrella

5 months ago

I'm a bit confused because I feel like both block and stream ciphers deal with bits, but block ciphers are the ones that group them together.

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Rex

5 months ago

I remember practicing with a question about different cipher types, and I think block ciphers were definitely mentioned as working on larger data chunks.

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Edison

5 months ago

I think block ciphers operate on groups of bits, but I'm not completely sure if that's the only type that does.

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Malcolm

5 months ago

This seems straightforward enough. I'll just take a quick look at the images, consider the options, and go with the one that seems most logical.

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Denny

5 months ago

Hmm, this is a tricky one. I know SAS Data Integration Studio has different deployment options, but I'm drawing a blank on the specifics. I'll have to review my notes to make sure I get this right.

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Reuben

5 months ago

Hmm, this one seems tricky. I'll need to think it through carefully.

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