That's the same as 2 78.9 - and the log 2 of that is 78.9. If you have a 12-character password, then L = 12. If your keyboard has 95 unique characters and you are randomly constructing a password from that whole set, then R = 95. While a password with 40-50 bits of entropy may be semi-safe now, it is only a matter of time until GPUs become more powerful, and password cracking takes less time! < 28 bits = Very Weak might keep out family membersĢ8 - 35 bits = Weak should keep out most people, often good for desktop login passwordsģ6 - 59 bits = Reasonable fairly secure passwords for network and company passwordsĦ0 - 127 bits = Strong can be good for guarding financial information Password strength is determined with this chart: I made a table below to outline the rest. We calculate password entropy by first looking at the pool of characters a password is made from.įor example, the password password would have a possible pool of 26 characters from the English alphabet.Ĭhanging the password to Password would increase your pool to 52 characters. Entropy is good: the bigger the E, the harder a password is to crack. Password entropy is a measurement of how unpredictable a password is.Į stands for "entropy," which is the opposite of an ordered pattern.
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