Password Security Audit Workflow
Evaluate password strength, generate bcrypt hashes, and calculate entropy for security audits.
Overview
A thorough password security audit involves evaluating existing password strength, understanding entropy requirements, and generating production-ready cryptographic hashes for secure storage. This workflow covers each step locally without exposing passwords to any server.
Step-by-Step Implementation
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Quick Summary
Run a full password security audit locally: measure entropy (target ≥ 75 bits for human passwords, ≥ 128 for keys), then hash with bcrypt cost factor 12+ for storage. All three tools are client-side, so passwords never leave the browser.
Key Takeaways
- NIST SP 800-63B retired complex composition rules in favor of length + entropy + breach checks.
- Bcrypt cost 12 ≈ 250ms per hash on 2025 hardware, slow enough to defeat brute-force, fast enough for login flow.
- Argon2id is the modern preferred KDF; bcrypt remains acceptable and is more widely supported.
- Entropy assumes random generation, `Password1!` has high theoretical entropy but appears in every breach corpus.
- Always pair strong hashing with rate limiting and breach-corpus checks (HIBP, Pwned Passwords).
When to use it
- Pre-launch security audit before exposing a login form to production traffic.
- Generating bcrypt hashes for seed data in staging databases.
- Validating a password policy proposal against entropy targets.
- Verifying a stored bcrypt hash matches a plaintext during incident response.
Common Mistakes
- Using bcrypt cost 10 or below in 2026, the cost should rise as hardware improves.
- Hashing on the client and sending the hash, the hash *is* the password if the server treats it as such.
- Confusing entropy with strength, `aaaaaaaaaaaaaaa` has length but ~0 bits of effective entropy.
- Pasting real production passwords into online strength checkers that aren't fully client-side.
Password Security Audit Workflow, Frequently Asked
Should I use bcrypt or Argon2id?
Argon2id is the OWASP-recommended default in 2026 (memory-hard, GPU-resistant). Bcrypt is still acceptable and has wider library support. Either is far better than SHA-256 or MD5.
What entropy target should I require?
≥ 60 bits for low-risk accounts, ≥ 75 bits for standard, ≥ 100+ bits for admin/financial. Random passphrases reach 75 bits at ~5 words from a 7,776-word list.
Are these tools actually offline?
Yes, all three run entirely in your browser. Open DevTools → Network and confirm no outbound requests when you click 'analyze'.