Eccouncil 212-81 Exam - Topic 12 Question 25 Discussion

Actual exam question for Eccouncil's 212-81 exam

Question #: 25
Topic #: 12

Early attempt to make substitution ciphers more robust, masks letter frequencies, plain text letters map to multiple cipher text symbols.

AScytale Cipher

BPlayfair Cipher

CHomophonic Substitution

DADFVGX Cipher

Show Suggested Answer

Suggested Answer: D

Integrity

https://en.wikipedia.org/wiki/Cryptographic_hash_function#Verifying_the_integrity_of_messages_and_files

An important application of secure hashes is verification of message integrity. Comparing message digests (hash digests over the message) calculated before, and after, transmission can determine whether any changes have been made to the message or file.

by Gearldine at Jan 23, 2024, 06:29 AM

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Alex

8 months ago

Scytale is way older, but not what they're describing here.

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Gwen

8 months ago

Not sure about that, seems a bit off to me.

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Brett

8 months ago

Wait, I thought the Playfair Cipher did that too?

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Afton

8 months ago

I agree, it masks frequencies really well.

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Ozell

8 months ago

That's definitely the Homophonic Substitution!

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Man

9 months ago

I feel like the ADFVGX Cipher is a bit more complex, so I doubt it's the answer. Homophonic Substitution seems more straightforward for this question.

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Clare

9 months ago

I practiced a question similar to this, and I recall that the Scytale Cipher is more about transposition than substitution, so I don't think it's the right choice.

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Albina

9 months ago

I'm not entirely sure, but I remember the Playfair Cipher being about digraphs, so it might not fit this description.

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Wilbert

9 months ago

I think the answer might be C, Homophonic Substitution, because it uses multiple symbols for the same letter to mask frequencies.

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Anisha

9 months ago

I'm a bit confused by the details here. Mapping plain text to multiple cipher text symbols is new to me. I'll have to review my notes and see if I can figure this out.

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Felicidad

9 months ago

Ah, I remember learning about this in class. This has to be a homophonic substitution cipher. I'm confident I can solve this one.

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Lashawnda

9 months ago

Okay, I've got an idea. The multiple cipher text symbols and obscuring letter frequencies makes me think this is a Playfair cipher. I'll give that a try.

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Shoshana

9 months ago

Hmm, I'm not sure about this one. The description doesn't sound familiar to me. I'll have to think it through carefully.

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Willie

9 months ago

This one seems tricky, but I think I can work through it. Masking letter frequencies and using multiple cipher text symbols sounds like a homophonic substitution cipher.

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Izetta

10 months ago

Okay, I've got a strategy for this. The question states that the internal audit is an independent function within the organization, so the appointment should come from a higher authority, not the internal audit manager. I'll eliminate that option and focus on the remaining choices.

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Skye

10 months ago

Okay, let's think this through step-by-step. The key is that the supervisor is not receiving any messages about orders needing approval. So I'd focus on options that deal with notification settings, like option E.

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Telma

10 months ago

I think I remember that variable names in Citrix use the percentage symbol, but I'm not sure if it should have an underscore.

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Simona

10 months ago

I remember similar questions, but they always had clear context. I'm not sure if "Source" fits here as a hazard itself.

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Dianne

1 year ago

Hold up, are we sure it's not the Bacon Cipher? I heard that one uses multiple symbols per letter too. Nah, just kidding, Homophonic is the way to go.

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Dorsey

1 year ago

Let's go with Homophonic Substitution for this one.

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Candida

1 year ago

I've heard of the Bacon Cipher too, but Homophonic Substitution seems like a better fit.

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Rhea

1 year ago

Yeah, Homophonic Substitution is a good option for making substitution ciphers more robust.

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Jose

1 year ago

I think Homophonic Substitution is the best choice here.

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Estrella

1 year ago

Scytale Cipher? Really? That's some ancient stuff. Homophonic Substitution is the clear choice here.

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Kasandra

1 year ago

ADFVGX Cipher? What kind of crazy cipher is that? I'm sticking with good old Homophonic Substitution.

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Catrice

1 year ago

Hmm, I was torn between Playfair and Homophonic, but the multiple cipher text symbols for plain text letters makes me think Homophonic is the way to go.

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