Eccouncil Exam 212-81 Topic 13 Question 56 Discussion

Actual exam question for Eccouncil's 212-81 exam

Question #: 56
Topic #: 13

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?

AFew collisions

BReversible

CVariable length input

DFixed length output

Show Suggested 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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Theron

5 days ago

Ooh, B) Reversible? Sounds like a magic trick, not a cryptographic hash. I'll pass on that one.

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Lelia

17 days ago

Haha, B) Reversible? What is this, amateur hour? Hashes are all about that irreversible goodness, baby!

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Lorenza

1 days ago

C) Variable length input

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Mayra

9 days ago

A) Few collisions

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Laine

22 days ago

Yes, B is the correct answer. Cryptographic hashes are not reversible, making them secure for password storage.

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Dalene

1 months ago

I agree with Ceola, cryptographic hashes are designed to be one-way functions.

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Ceola

1 months ago

I think B is not true because cryptographic hashes are not reversible.

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Dudley

1 months 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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Jenise

1 days ago

D) Fixed length output

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Vilma

22 days ago

C) Variable length input

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Pamella

27 days ago

B) Reversible

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Virgina

28 days ago

A) Few collisions

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Lorrine

1 months ago

B) Reversible

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Hester

1 months 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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Georgene

3 days 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

5 days ago

D) Fixed length output

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Shantell

8 days ago

C) Variable length input

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Anissa

11 days ago

B) Reversible

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Craig

16 days ago

A) Few collisions

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