Measuring Passwords Strength With Entropy Professionals and tools assess passwords with bits of entropy. It measures how random a password is with a mathematical formula that can look like that: E = log2(Rᴸ) There are some variants of the formula, but, theoretically, the higher the entropy (E) is, the stronger is the password against brute-force attacks. R is for the number of available characters, and L is the total length. As a result, mixing letters, capital letters, special characters, and numbers increase entropy significantly. However, the length is even more critical. However, it's just an indicator. Again, if you reuse the same password everywhere or if your password is leaked, it's game over, regardless of the entropy.
jmau111
Cybersecurity aware developer.
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