A _____ is a function that takes a variable-size input m and returns a fixed-size string.

A _____ is a function that takes a variable-size input m and returns a fixed-size string.
A . Feistel
B. Asymmetric cipher
C. Symmetric cipher
D. Hash

View Answer

Answer: D

Explanation:

Hash

https://en.wikipedia.org/wiki/Hash_function

A hash function is any function that can be used to map data of arbitrary size to fixed-size values.