Answer:
Permutation cipher
This is a complete enumeration of all possible keys of small length (we have a length of 2).
The first digit is 1, 2, 3, ..., 8, 9.
Second digit 0, 1, 2,…, 8, 9
Number of options: 9*10 = 90
10, 11, 12, … 97, 98, 99
Brute-force attack
Step-by-step explanation:
a brute force attack is when you use a bunch of random passwords in the hopes of eventually getting it right
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