Do I need to install anything?

No. It runs in any modern browser, free, with no account required.

For Engineers · Shannon Entropy

Shannon Entropy for a secret-sharing scheme

Built for engineers using it for real design work. Go from concept to a running model in the browser, then scale to the cloud when needed. Simulate a secret-sharing scheme live below — adjust the inputs and watch it respond, right in your browser.

Shannon Entropy & PasswordsLive

measuring information & strength

Entropy

60bits

brute-force time: 1 yr

Controls

Password / string

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.

▶ Run in Python

Data Inspector

Character pool62

Entropy59.5 bits

Strengthreasonable

Crack time1 yr

Governing equation

H = - i \sum p_{i} lo g_{2} p_{i} = lo g_{2} 62 = 5.95 bits/char \Rightarrow 10 \times 5.95 = 59.5 bits

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.

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

or unlock everything with Pro →

Also for:Students Researchers Educators Hobbyists & Makers K-12 Students First Responders General version →

More with Shannon Entropy

Shannon Entropy for an RSA key Shannon Entropy for a password hash Shannon Entropy for a digital signature Shannon Entropy for a Diffie-Hellman exchange Shannon Entropy for a block cipher Shannon Entropy for a hash collision Shannon Entropy for a one-time pad Shannon Entropy for a Caesar cipher

Frequently asked questions

Is this good for engineers?: Yes — this version of "Shannon Entropy for a secret-sharing scheme" is framed for engineers using it for real design work. Go from concept to a running model in the browser, then scale to the cloud when needed.
Do I need to install anything?: No. It runs in any modern browser, free, with no account required.