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Eccouncil 212-81 Exam - Topic 13 Question 56 Discussion

Actual exam question for Eccouncil's 212-81 exam
Question #: 56
Topic #: 13
[All 212-81 Questions]

Cryptographic hashes are often used for message integrity and password storage. It is important to understand the common properties of all cryptographic hashes. What is not true about a hash?

Show Suggested Answer Hide Answer
Suggested Answer: B

Reversible

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

Hash functions are not reversible.

Incorrect answers:

Fixed length output and Variable length input. Hash function receive variable length input and produce fixed length output

Few collisions. Every hash function with more inputs than outputs will necessarily have collisions


by Jacquelyne at May 05, 2025, 09:04 AM

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Alfred
5 months ago
Fixed length output is a must for hashes, right?
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Carylon
5 months ago
I thought hashes could be variable length?
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Lanie
6 months ago
Hashes should have few collisions, that's true.
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Lajuana
6 months ago
Wait, are we sure about the few collisions part? Sounds risky!
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Shawna
6 months ago
Definitely not reversible, that's a key property!
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Shawnna
6 months ago
I feel like fixed length output is a standard property of hashes, so D should be true too. This is tricky!
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Sabrina
6 months ago
I practiced a similar question about hash properties, and I recall that they can take variable length inputs, so C seems correct.
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Gerald
7 months ago
I'm not entirely sure, but I think hashes are supposed to be irreversible, which makes option B the right answer for what is not true.
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Annalee
7 months ago
I remember that hashes should have few collisions, so I think option A is true.
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Mollie
7 months ago
Hmm, I'm a bit stumped. I know cryptographic hashes have some key properties, but I'm not sure which one is not true. I'll have to think this through carefully and eliminate the options that I'm more confident are true.
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Ashlyn
7 months ago
I've got a good feeling about this one. Cryptographic hashes are designed to have very few collisions, so that can't be the answer. And they definitely accept variable-length inputs. The only option left is that they are reversible, which is not true. I'm going with that.
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Bong
7 months ago
Whoa, I'm a little confused here. I thought cryptographic hashes were supposed to have fixed-length outputs, but one of the options says that's not true. I better double-check my understanding on this.
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Tiffiny
8 months ago
Okay, I've got this. Cryptographic hashes are supposed to be one-way, meaning they can't be reversed. So the answer must be that they are reversible, which is not true.
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Shawnda
8 months ago
Hmm, this is a tricky one. I know cryptographic hashes have some key properties, but I'm not sure which one is not true. Let me think this through carefully.
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Theron
12 months ago
Ooh, B) Reversible? Sounds like a magic trick, not a cryptographic hash. I'll pass on that one.
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Reiko
11 months ago
User 3: D) Fixed length output is also a common property of cryptographic hashes.
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Miles
11 months ago
User 2: Miles is correct, collisions can happen with hashes.
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Blondell
11 months ago
Yeah, a reversible hash defeats the purpose of hashing in the first place.
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Blondell
11 months ago
I agree, a reversible hash doesn't sound secure at all.
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Dawne
11 months ago
User 1: A) Few collisions is not true about a hash.
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Lelia
1 year ago
Haha, B) Reversible? What is this, amateur hour? Hashes are all about that irreversible goodness, baby!
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Wilburn
11 months ago
D) Fixed length output
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Lorenza
12 months ago
C) Variable length input
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Mayra
12 months ago
A) Few collisions
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Laine
1 year ago
Yes, B is the correct answer. Cryptographic hashes are not reversible, making them secure for password storage.
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Dalene
1 year ago
I agree with Ceola, cryptographic hashes are designed to be one-way functions.
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Ceola
1 year ago
I think B is not true because cryptographic hashes are not reversible.
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Dudley
1 year ago
Definitely B) Reversible. That's like the opposite of what a hash is supposed to do. Might as well just store the original message!
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Chana
11 months ago
That's right, B) Reversible is definitely not a property of a cryptographic hash.
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Trinidad
12 months ago
Exactly, B) Reversible defeats the purpose of using a hash for security.
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Willard
12 months ago
Agreed, B) Reversible is not true. A hash should not be reversible.
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Jenise
12 months ago
D) Fixed length output
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Vilma
1 year ago
C) Variable length input
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Pamella
1 year ago
B) Reversible
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Virgina
1 year ago
A) Few collisions
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Lorrine
1 year ago
B) Reversible
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Hester
1 year ago
B) Reversible? That's a big no-no for a secure hash! Hashes are supposed to be one-way, not reversible.
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Justine
12 months ago
B) Reversible is not true about a hash.
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Georgene
12 months ago
Reversible? That's a big no-no for a secure hash! Hashes are supposed to be one-way, not reversible.
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Fidelia
12 months ago
D) Fixed length output
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Shantell
12 months ago
C) Variable length input
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Anissa
12 months ago
B) Reversible
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Craig
1 year ago
A) Few collisions
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