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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Dalene

12 days ago

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

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Ceola

14 days ago

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

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Dudley

14 days 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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Pamella

3 days ago

B) Reversible

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Virgina

4 days ago

A) Few collisions

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Lorrine

15 days ago

B) Reversible

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Hester

18 days 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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