How to calculate the keyspace of a password?

Which of the follow keypsaces is the biggest?

option 1: 16 numbers [0,9]
option 2: 30 vowels
option 3: 16 letters from the alphabet
option 4: 32 bits

Can someone help me, by telling me which one it´s the right answer and how we can calculate that? I know that in the last option it´s 2^32, but I´m not sure about the others.

Read more here:

Content Attribution

This content was originally published by David at Recent Questions - Stack Overflow, and is syndicated here via their RSS feed. You can read the original post over there.

%d bloggers like this: