Which of the following is NOT a property of a one-way hash function?

The correct answer is A. It converts a message of a fixed length into a message digest of arbitrary length. Option A is incorrect because it reverses how hash functions work: a hash function takes a message of ARBITRARY length as input and produces a message digest of FIXED length - not the other way around. Option C correctly describes this property. The other valid properties of a…

Submitted by yaw92· Apr 18, 2026Cryptography

Question

Options

AIt converts a message of a fixed length into a message digest of arbitrary length.
BIt is computationally infeasible to construct two different messages with the same digest.
CIt converts a message of arbitrary length into a message digest of a fixed length.
DGiven a digest value, it is computationally infeasible to find the corresponding message.

How the community answered

(68 responses)

A
90% (61)
B
6% (4)
C
3% (2)
D
1% (1)

Explanation

Option A is incorrect because it reverses how hash functions work: a hash function takes a message of ARBITRARY length as input and produces a message digest of FIXED length - not the other way around. Option C correctly describes this property. The other valid properties of a one-way hash function are: collision resistance (B) - it is computationally infeasible to find two different messages with the same digest; and pre-image resistance (D) - given only the digest, it is computationally infeasible to recover the original message.

Topics

#Hash Functions#Cryptography Principles#Data Integrity#Message Digest

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