Password Generator
Generate cryptographically secure passwords, passphrases, and PINs from the command line. Analyze existing passwords for strength. Uses Python secrets module for CSPRNG — no external dependencies.
Quick Start
# Generate a 16-character password
python3 scripts/password_gen.py
# Generate a 32-character password, 5 at a time
python3 scripts/password_gen.py -l 32 -n 5
# Passphrase (4 random words)
python3 scripts/password_gen.py --passphrase
# 6-word passphrase, capitalized, with number
python3 scripts/password_gen.py --passphrase -w 6 --capitalize --add-number
# PIN
python3 scripts/password_gen.py --pin
python3 scripts/password_gen.py --pin -l 8
# Analyze a password
python3 scripts/password_gen.py --analyze 'MyP@ssw0rd!'
# JSON output
python3 scripts/password_gen.py --json
Commands
| Flag | Description |
|---|---|
-l, --length N |
Password length (default: 16) |
-n, --count N |
Generate N passwords |
--no-uppercase |
Exclude uppercase letters |
--no-lowercase |
Exclude lowercase letters |
--no-digits |
Exclude digits |
--no-symbols |
Exclude symbols |
--exclude CHARS |
Exclude ambiguous chars like lI1O0 |
--must-include CHARS |
Force specific characters to appear |
--passphrase |
Word-based passphrase mode |
-w, --words N |
Words in passphrase (default: 4) |
--separator SEP |
Passphrase separator (default: -) |
--capitalize |
Capitalize passphrase words |
--add-number |
Append random number to passphrase |
--pin |
Numeric PIN mode |
--analyze PW |
Analyze existing password strength |
--json |
JSON output |
Entropy Guide
| Bits | Strength | Use Case |
|---|---|---|
| < 28 | Very Weak | Never use |
| 28-35 | Weak | Throwaway accounts only |
| 36-59 | Moderate | General accounts |
| 60-79 | Strong | Important accounts |
| 80-127 | Very Strong | Financial, admin |
| 128+ | Excellent | Master passwords, encryption keys |