What does the key length represent
A.
Hash block size
B.
Cipher block size
C.
Number of permutations
D.
???
Explanation:
BD
In cryptography, an algorithm’s key space refers to the set of all possible permutations of a keys.
If a key were eight bits (one byte) long, the keyspace would consist of 28 or 256 possible keys. Advanced
Encryption Standard (AES) can use a symmetric key of 256 bits, resulting in a key space containing 2256 (or
1.1579 × 1077) possible keys.
Source: https://en.wikipedia.org/wiki/Key_space_(cryptography)