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A _____ is a function that takes a variable-size input m and returns a fixed-size string.
Suggested Answer: D
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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.
30 comments · newest first
TA
Tatum
6 months ago
Yeah, D) Hash is the best choice. It’s straightforward!
JO
Jospeh
7 months ago
I’m leaning towards D too. Symmetric and asymmetric ciphers don’t match.
CO
Cordelia
7 months ago
Definitely D) Hash. It’s all about that fixed-size string.
AU
Audrie
7 months ago
I feel like A) Feistel could be a trick option, but it’s not the right fit.
RE
Reena
7 months ago
Hash functions are super important for data integrity!
ET
Ettie
7 months ago
I thought it was an asymmetric cipher at first.
NA
Nada
7 months ago
Wait, isn't a Feistel structure also related to this?
CH
Chau
8 months ago
Agreed, D is the right answer!
DA
Dacia
8 months 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."
LO
Louann
8 months 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.
FE
Felix
9 months ago
D) Hash, easy peasy. Now, if only I could remember how to pronounce "Feistel" without sounding like a cat with a hairball.
BE
Bette
9 months ago
Definitely D. I always get my hashes and ciphers mixed up, but this one's a no-brainer.
JU
Julio
9 months ago
D) Hash is the correct answer. It's a one-way function that converts variable-length input into a fixed-size output.
DY
Dyan
9 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.
RA
Rashad
9 months ago
This question seems familiar; I practiced something similar where we discussed how hashes are used in data integrity.
LA
Lacey
9 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.
ME
Mee
10 months ago
Hash functions are my strong suit. The description fits perfectly, so I'm confident option D is the correct answer.
CY
Cyril
10 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.
KA
Karima
10 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.
DO
Donette
10 months ago
Agreed! Hash functions always return a fixed-size output.
RE
Remona
10 months ago
I think the answer is D) Hash. It fits the description perfectly.
VI
Vicki
10 months ago
It's definitely a Hash!
PA
Patrick
11 months ago
I think I remember hash functions being described as returning fixed-size outputs, so I’m leaning towards D.
NA
Nada
11 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.
TA
Tamar
11 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.
SH
Shawnta
6 months ago
Hash is the clear choice here!
FI
Filiberto
6 months ago
Feistel and ciphers don't fit the description.
BE
Bernardo
6 months ago
Hash functions are designed for that!
LI
Lilli
6 months ago
I agree, it's definitely about the fixed-size output.
JE
Jettie
11 months ago
Exactly, hashes are essential in cryptography.