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Eccouncil 212-81 Exam - Topic 8 Question 64 Discussion

Actual exam question for Eccouncil's 212-81 exam
Question #: 64
Topic #: 8
[All 212-81 Questions]

A _____ is a function that takes a variable-size input m and returns a fixed-size string.

Show Suggested Answer Hide Answer
Suggested Answer: D

Hash

https://en.wikipedia.org/wiki/Hash_function

A hash function is any function that can be used to map data of arbitrary size to fixed-size values.


by Mozell at Nov 23, 2025, 10:36 PM

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Reena
4 days ago
Hash functions are super important for data integrity!
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Ettie
9 days ago
I thought it was an asymmetric cipher at first.
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Nada
14 days ago
Wait, isn't a Feistel structure also related to this?
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Chau
1 month ago
Agreed, D is the right answer!
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Dacia
1 month ago
D) Hash, no doubt. Although, I'm pretty sure a Feistel cipher is just a fancy way of saying "the secret ingredient is cheese."
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Louann
1 month ago
D) Hash, for sure. Although, I'm still trying to figure out who this "Feistel" guy is and why he's got a function named after him.
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Felix
2 months ago
D) Hash, easy peasy. Now, if only I could remember how to pronounce "Feistel" without sounding like a cat with a hairball.
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Bette
2 months ago
Definitely D. I always get my hashes and ciphers mixed up, but this one's a no-brainer.
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Julio
2 months ago
D) Hash is the correct answer. It's a one-way function that converts variable-length input into a fixed-size output.
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Dyan
2 months ago
I’m a bit confused, though. Could a Feistel function also fit this description? I need to double-check my notes on that.
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Rashad
2 months ago
This question seems familiar; I practiced something similar where we discussed how hashes are used in data integrity.
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Lacey
2 months ago
I’m not entirely sure, but I feel like asymmetric and symmetric ciphers deal more with encryption rather than just returning a string.
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Mee
3 months ago
Hash functions are my strong suit. The description fits perfectly, so I'm confident option D is the correct answer.
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Cyril
3 months ago
I'm a bit confused here. Is a hash the same as a symmetric cipher? I need to review my notes on the different cryptographic primitives.
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Karima
3 months ago
Okay, I've got this. A hash function takes a variable-size input and returns a fixed-size output. That matches the description, so I'm going with option D.
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Donette
3 months ago
Agreed! Hash functions always return a fixed-size output.
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Remona
3 months ago
I think the answer is D) Hash. It fits the description perfectly.
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Vicki
4 months ago
It's definitely a Hash!
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Patrick
4 months ago
I think I remember hash functions being described as returning fixed-size outputs, so I’m leaning towards D.
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Nada
4 months ago
Ugh, I'm not sure about this one. The options seem pretty technical. I'll have to think carefully about the differences between the types of ciphers.
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Tamar
4 months ago
Hmm, this looks like a question on cryptographic functions. I think the key is to focus on the description of a fixed-size output, which points to a hash function.
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Jettie
4 months ago
Exactly, hashes are essential in cryptography.
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