For Engineers · Shannon Entropy
Shannon Entropy for an RSA key
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Shannon Entropy & PasswordsLive
measuring information & strength
Entropy
60bits
brute-force time: 1 yr
Controls
Shannon entropy measures information in bits — how many yes/no questions it takes to pin down a value. For a password it is length times the log₂ of the character-set size, quantifying how unpredictable it is. Each extra bit doubles the guessing effort, so length beats complexity: a long passphrase can carry more entropy than a short scramble of symbols.
Data Inspector
Character pool62
Entropy59.5 bits
Strengthreasonable
Crack time1 yr
Governing equation
Reading this result: 60 bits is reasonable for low-value logins but short of the ~60-bit bar; each added character here is worth 6.0 more bits.
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