The password "Summer2017" is 10 characters long, and uses upper and lowercase alphanumeric characters. Web based brute forcing would be much slower.) (Note: these numbers are based on GPU hash breaking and require a data dump of password hashes. Someone with a data mining system might be able to get 2^55 passwords or possibly more, depending on their hardware. For some context, it's realistic that a normal person with a single graphics card on their computer can guess about 2^49 passwords per day. A password with n bits of entropy would require 2^n guesses to guarantee that password will be found. A password that requires at most 2 guesses to find has 1 bit of entropy.
This measurement is known as bits of entropy.Ī password that is already known has zero bits of entropy.
We can now measure the strength of a password as the number of guesses it would take to guarantee we guess the password, assuming we know the character set the password uses. Eventually, this script would find all passwords that are strictly lower case alphabetical characters. An example of this might be to start with "a", then "b", then "c" and continue until "z", at which point the program would try "aa", then "ab" and so on. This involves setting up an automated script to literally attempt all possible combinations of characters for that password. These requirements are in place to raise the entropy of a password and make it much harder for an attacker to guess your password.Ī common way to break passwords on a user account is to use a "brute force" method. It's common to see "Your password must contain characters from three of the following categories" to be able to set your password. Passwords are obviously required to keep your online accounts and data safe, but how strong is your password? The idea of a strong password can be hard to quantify and most places require your passwords to meet some requirements.
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