How is entropy calculated in a password?

Question

Passwords

Everyone has seen this picture:

spoiler

How is entropy calculated? And 1000 requests per second seems like a very small number.

Answer 1

I can't figure out how enropy was calculated?

According to this algorithm, the entropy of a human-made password made up of 8 characters, not containing capital letters and not containing non-alphabetic characters, will be about 4 + 7 * 2 = 18 bits. The algorithm is based on the assumption that people choose passwords with the same entropy as plain English text.https://en.wikipedia.org/wiki/Password_difficulty#Par...

And 1000 requests per second seems like a very small number.

I'd really like to see a web server that allows you to hit it more frequently.