Password Generator
A password generator creates random passwords with specified length and character types. Password strength is measured in bits of entropy: a password with entropy N bits would take 2^N guesses to crack by brute force.
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Tip: Use a password manager (Bitwarden, 1Password, etc.) and generate unique 20+ character passwords for every site. The only password you need to remember is your master password — make it a 5-word passphrase.
- 1Entropy = log₂(charset size^length) = length × log₂(charset size)
- 2Lowercase only (26): 8 chars = 37.6 bits
- 3Mixed case + digits (62): 12 chars = 71.4 bits
- 4All printable ASCII (95): 16 chars = 104.9 bits — very strong
| Length | Characters | Entropy | Crack time (GPU) |
|---|---|---|---|
| 8 | Lowercase only | 37.6 bits | Minutes |
| 8 | Mixed + numbers | 47.6 bits | Hours–days |
| 12 | Mixed + numbers | 71.4 bits | Years |
| 16 | All ASCII | 104.9 bits | Trillions of years |
| 4 words (passphrase) | Diceware (7,776 words) | 51.7 bits | Centuries |
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Fun Fact
The most common passwords are still '123456', 'password', 'qwerty', and '111111'. In every major data breach, millions of accounts use these passwords. Using a password manager eliminates the need to remember complex passwords.
References
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