Eccouncil 212-81 Exam - Topic 14 Question 35 Discussion

Actual exam question for Eccouncil's 212-81 exam

Question #: 35
Topic #: 14

You are studying classic ciphers. You have been examining the difference between single substitution and multi-substitution. Which one of the following is an example of a multi-alphabet cipher?

ARot13

BCaesar

CAtbash

DVigenre

Show Suggested Answer

Suggested Answer: D

Vigenre

https://en.wikipedia.org/wiki/Vigen%C3%A8re_cipher

The Vigenre cipher is a method of encrypting alphabetic text by using a series of interwoven Caesar ciphers, based on the letters of a keyword. It employs a form of polyalphabetic substitution.

First described by Giovan Battista Bellaso in 1553, the cipher is easy to understand and implement, but it resisted all attempts to break it until 1863, three centuries later. This earned it the description le chiffre indchiffrable (French for 'the indecipherable cipher'). Many people have tried to implement encryption schemes that are essentially Vigenre ciphers. In 1863, Friedrich Kasiski was the first to publish a general method of deciphering Vigenre ciphers.

by Felicitas at Jun 23, 2024, 09:05 AM

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Ramonita

3 months ago

Surprised Vigenère is the answer, thought it was more complex!

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Timothy

3 months ago

I always get confused with these!

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Margot

3 months ago

Nope, just a single substitution.

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Annice

4 months ago

I thought Atbash was multi-alphabet too?

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Ty

4 months ago

Vigenère is definitely a multi-alphabet cipher!

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Goldie

4 months ago

I have a feeling that Vigenère is the correct choice, but I need to double-check if it really qualifies as multi-alphabet.

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Iesha

4 months ago

I practiced a question like this, and I believe Atbash is also a single substitution, so it can't be the answer.

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Gail

4 months ago

I'm not entirely sure, but I remember that Rot13 is just a single substitution cipher, right?

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Gregoria

5 months ago

I think the Vigenère cipher is the one we're looking for since it uses multiple alphabets based on the keyword.

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Catalina

5 months ago

Ugh, I always mix up the different cipher types. Let me think this through step-by-step. Rot13 uses a different alphabet, so that must be a multi-alphabet cipher. I'll go with that.

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Michael

5 months ago

Okay, I've got this. Rot13 is a great example of a multi-alphabet cipher because it uses a different alphabet for encoding and decoding. I'm feeling confident about this one.

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Terina

5 months ago

This is a classic exam question on ciphers. I think the key is to remember the difference between single substitution and multi-substitution ciphers. Rot13 is a good example of a multi-alphabet cipher.

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Rosalia

5 months ago

Hmm, I'm a bit confused on the difference between these types of ciphers. I'll need to review my notes to make sure I understand the concepts before answering this.

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Margret

5 months ago

Hmm, I'm not entirely sure about this one. I'll need to think through the different factors a data owner would need to consider before implementing a policy. Maybe I should review my notes on data governance.

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Ryan

5 months ago

Okay, I've got this. The key is to establish a starting point or reference point before making any improvements. That way, you can demonstrate the changes and measure the impact. I'm confident A. Baseline is the correct answer.

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Providencia

2 years ago

Hmm, let's see. Rot13 is just a simple shift, Caesar is also a shift, and Atbash is just flipping the alphabet. Gotta be Vigenre for the multi-sub action.

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