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A password entropy calculator measures the cryptographic strength of a password in bits: entropy = log₂(character set size^password length). A 12-character password using upper, lower, digits, and symbols has ~79 bits of entropy. At least 60–70 bits is generally recommended; password managers make using high-entropy passwords practical.
ステップバイステップガイド
- 1Count character set size
- 2Calculate combinations for length
- 3Show bits of entropy
解いた例
入力
12 char password, mixed case+numbers
結果
~79 bits entropy
Measure of password strength
避けるべきよくある間違い
- ✕Not double-checking results
- ✕Ignoring edge cases
よくある質問
What does this calculator do?
Input values
How do I use this calculator?
System calculates
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