Interactive Demo — Unit 14: Authentication & Access Control

Password Entropy Visualizer

Entropy is measured in bits — the same binary you've been converting all week. More character types and more length both add bits, and every bit doubles the number of guesses an attacker needs.

Entropy Calculator passwords are never stored or transmitted
Entropy
0 bits
Possible Combinations
1
Key Concepts
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Entropy = Uncertainty
Entropy measures how many guesses an attacker needs on average. More bits means exponentially more guesses — 1 extra bit doubles the work.
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Pool Size Matters
Each character type you add — lowercase, uppercase, digits, symbols — multiplies the pool of possible characters per position.
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Length Beats Complexity
A long password with fewer character types often has more entropy than a short "complex" one — length has an outsized effect on total bits.