Eccouncil 112-51 Exam - Topic 7 Question 22 Discussion

Actual exam question for Eccouncil's 112-51 exam

Question #: 22
Topic #: 7

Kevin, a security team member, was instructed to share a policy document with the employees. As it was supposed to be shared within the network, he used a simple algorithm to encrypt the document that just rearranges the same characters to produce the ciphertext.

Identify the type of cipher employed by Kevin in the above scenario.

ASubstitution cipher

BStreamn cipher

CTransposition cipher

DBlock cipher

Show Suggested Answer

Suggested Answer: C

A transposition cipher is a type of cipher that encrypts a document by rearranging the same characters to produce the ciphertext. A transposition cipher does not change the identity or frequency of the characters, but only their position. A transposition cipher can use various methods to permute the characters, such as writing them in a grid and reading them in a different order, or shifting them along a rail fence pattern. A transposition cipher is a simple and fast algorithm, but it can be easily broken by frequency analysis or anagramming. A transposition cipher is the type of cipher employed by Kevin in the above scenario, as he used a simple algorithm to encrypt the document that just rearranges the same characters to produce the ciphertext. Reference:

Transposition cipher - Wikipedia

Network Security: Transposition Cipher Techniques - Coding Streets

Network Defense Essentials (NDE) | Coursera - Module 4: Cryptography Techniques

Columnar Transposition Cipher - GeeksforGeeks

by Jonelle at Sep 14, 2024, 02:57 PM

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Ricki

4 months ago

Block ciphers are more complex, not this one.

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Viola

5 months ago

Wait, are we sure? Rearranging sounds too simple.

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Lizette

5 months ago

Agreed, transposition makes sense here.

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Grover

5 months ago

I thought it was a substitution cipher at first.

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Fidelia

5 months ago

That's definitely a transposition cipher!

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Dean

6 months ago

I keep mixing up transposition and substitution ciphers. I hope I remember correctly that this is a transposition cipher!

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Leonida

6 months ago

I practiced a similar question, and it was about how transposition ciphers work by shuffling letters. I feel like that's what Kevin did.

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Jodi

6 months ago

I'm not entirely sure, but I remember something about substitution ciphers changing characters completely, so that doesn't seem right here.

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Cherry

6 months ago

I think this might be a transposition cipher since it just rearranges the characters without changing them.

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Viva

6 months ago

Okay, I think I've got it. Since the question says the algorithm "just rearranges the same characters," that points to a transposition cipher, where the order of the characters is changed but the characters themselves remain the same.

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Lashandra

6 months ago

Hmm, I'm a bit confused. The question mentions a "simple algorithm" to encrypt the document, but it doesn't specify if the characters are substituted or just rearranged. I'll need to think this through carefully.

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Rosalind

6 months ago

This seems like a straightforward question. The key details are that the algorithm just rearranges the characters, so it's likely a transposition cipher.

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Douglass

6 months ago

I'm pretty confident this is a transposition cipher. The key detail is that the algorithm "just rearranges the same characters," which means it's not a substitution cipher where the characters are replaced. A transposition cipher seems like the best fit.

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Lavonna

1 year ago

Kevin probably thought, 'Hey, if it's good enough for the ancient Egyptians, it's good enough for me!' Transposition cipher all the way.

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Gregoria

1 year ago

Hmm, I'm not sure. Maybe he was just feeling lazy and wanted to keep it simple. A transposition cipher is like the kiddie pool of cryptography.

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Dona

1 year ago

Wait, wasn't Kevin supposed to use a more secure algorithm? A transposition cipher is so basic, my grandma could crack that in her sleep.

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Merri

1 year ago

D) Block cipher

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Eugene

1 year ago

C) Transposition cipher

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Daryl

1 year ago

B) Stream cipher

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Lou

1 year ago

A) Substitution cipher

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Sommer

2 years ago

Definitely a transposition cipher, Kevin didn't replace any characters, he just rearranged them. Easy peasy!

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Alesia

2 years ago

Kevin probably thought, 'Hey, if it's good enough for the ancient Egyptians, it's good enough for me!' Transposition cipher all the way.

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Craig

1 year ago

C) Transposition cipher

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Alona

1 year ago

B) Stream cipher

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Tambra

1 year ago

A) Substitution cipher

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Anika

2 years ago

Hmm, I'm not sure. Maybe he was just feeling lazy and wanted to keep it simple. A transposition cipher is like the kiddie pool of cryptography.

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Isidra

2 years ago

Wait, wasn't Kevin supposed to use a more secure algorithm? A transposition cipher is so basic, my grandma could crack that in her sleep.

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Kimi

1 year ago

A) Substitution cipher

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Ashley

1 year ago

Transposition cipher is not very secure, Kevin should have used a stronger encryption method.

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Gearldine

1 year ago

D) Block cipher

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Mammie

1 year ago

C) Transposition cipher

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Arlene

2 years ago

B) Stream cipher

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Dean

2 years ago

A) Substitution cipher

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Zona

2 years ago

I'm not sure, but I think it could also be a Stream cipher since it rearranges characters in a continuous stream.

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Stephaine

2 years ago

Definitely a transposition cipher, Kevin didn't replace any characters, he just rearranged them. Easy peasy!

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Roosevelt

2 years ago

D) Block cipher

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Alonzo

2 years ago

C) Transposition cipher

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Ilda

2 years ago

B) Stream cipher

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Stephaine

2 years ago

A) Substitution cipher

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Ernest

2 years ago

I agree with Jin, because rearranging characters sounds like a Transposition cipher.

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Jin

2 years ago

I think Kevin used a Transposition cipher.

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