What size is an MD5 message digest (hash)?

The correct answer is A. 128 bits. MD5 is a one-way hash function producing a 128-bit message digest from the input message, through 4 rounds of transformation. MD5 is specified as an Internet Standard (RFC1312).

Submitted by kevin_r· Apr 18, 2026Cryptography

Question

What size is an MD5 message digest (hash)?

Options

A128 bits
B160 bits
C256 bits
D128 bytes

How the community answered

(21 responses)

A
90% (19)
C
5% (1)
D
5% (1)

Explanation

MD5 is a one-way hash function producing a 128-bit message digest from the input message, through 4 rounds of transformation. MD5 is specified as an Internet Standard (RFC1312).

Topics

#MD5#Cryptographic Hashing#Hash Size

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