Multiple choice technology security

What algorithm outputs a 128-bit message digest regardless of the length of the input?

  1. SHA

  2. MD5

  3. RC4

  4. RC6

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

MD5 is a hashing algorithm designed to produce a fixed 128-bit digest from inputs of any length. SHA variants produce digests of 160 bits or larger, while RC4 and RC6 are symmetric stream and block ciphers rather than hashing functions.