Password Strength Analyzer
Analyze password entropy, character variance, and estimated brute-force crack time.
Password Strength Analyzer
85 bits
13 chars
4/4
Several Centuries
About Password Strength Analyzer
The Password Strength & Entropy Analyzer evaluates passwords in real time using the zxcvbn information entropy model, estimating crack time against GPU brute-force clusters, dictionary attacks, and common password leaks with zero network transmission.
How to Use Password Strength Analyzer
Step 1
Type a password into the test field.
Step 2
Inspect the live entropy meter and visual strength score (0 to 4).
Step 3
Review estimated crack times and vulnerability warning alerts.
Step 4
Follow the actionable recommendations to strengthen your credentials.
Practical Use Cases for Password Strength Analyzer
Personal Credential & Master Password Hardening
Test password manager master passwords and PINs to ensure immunity against offline dictionary attacks.
Authentication Policy Security Auditing
Evaluate password complexity rules and discover common pattern vulnerabilities (keyboard walks, date substitutions).
Input & Output Examples
Analyzing Passphrase "correct-horse-battery-staple"
Password: "correct-horse-battery-staple"
Entropy: 82.4 bits | Strength: Very Strong (Score: 4/4) | Estimated Crack Time: Centuries (Offline GPU Cluster)
Key Features & Performance
- ✓Calculates exact Shannon Information Entropy in bits.
- ✓Estimates realistic cracking time across 4 attacker models (Online Throttled, Online Unthrottled, Offline Slow Hash, Offline Fast GPU).
- ✓Identifies pattern vulnerabilities: dictionary words, repetitive sequences, keyboard walks (qwerty, 12345), and common leetspeak substitutions.
- ✓100% Client-Side memory execution guarantees password confidentiality.
- ✓Real-time actionable hardening suggestions.
Key Terminology & Definitions
Password Entropy (Bits)
A mathematical measure of unpredictability: an 80-bit entropy password requires 2^80 brute-force attempts on average to crack.
Offline GPU Brute-Force
An attack scenario where a compromised hash database is cracked locally on high-speed GPU rigs capable of billions of guesses per second.