According to Mark Stockley, founder of web consultancy Compound Eye, these meters don’t actually measure strength at all. Stockley tested five different password meters, first in March 2015 and then 18 months later. He says none of them improved during that time.
Writing for Sophos, he explained that password meters only attempt to measure how long it would take to crack the password. A meter on the website typically suggests you use a long password with uppercase and lowercase characters and symbols like question marks and exclamation points.
“A strong password is one that is highly resistant to attempts to crack it with online or offline dictionary attacks,” he said. “The only good way to measure the strength of a password is to try and crack it — a serious and seriously time-consuming business that requires specialist software and expensive hardware.”
As part of his tests, Stockley ran five passwords that he deemed terrible through the meters. If the meters were up to par, they would reject them. The five passwords were “abc123,” “trustno1,” “ncc1701,” “primetime21,” and “iloveyou!” More often than not, the passwords passed the meter with some getting a “good” or “normal” result.
To further corroborate his findings, Stockley was able to crack these five passwords with the open source tool John the Ripper, making it clear that the passwords weren’t cut out for securing your accounts.
So nothing had improved in over a year. In his latest tests, Stockley added a sixth password meter, the very popular zxcvbn, which is used by Dropbox and WordPress. It deemed all five terrible passwords “very weak,” marking something of an improvement.
However, Stockley still remains highly critical of password meters that “muddy the waters with misleading or ambiguous terminology and colors,” and encouraged the use of two-factor authentication.
