Password Strength Analyser

Analyze password strength, calculate exact Shannon entropy bits, detect dictionary pattern weaknesses, and estimate offline brute-force crack times against fast GPU cracking hardware.

Why Use This Tool?

• Password Security Auditing: Test your personal or corporate passwords for vulnerability to dictionary and brute-force attacks.
• Understand Password Crack Times: See how adding length and special characters drastically increases brute-force time from seconds to centuries.
• Pattern Weakness Detection: Detect weak repetitive patterns, keyboard walks (`qwerty`), and common substitutions (`p@ssword`).

How to Use

1. Enter password into the analyzer field.
2. View real-time Entropy Score (Bits), Quality Score (Weak, Fair, Strong, Very Strong), and Estimated Crack Time.
3. Inspect detected pattern warnings and improvement suggestions.

Real Working Example

Input:

Password: "CorrectHorseBatteryStaple#2026"

Output Result:

Entropy: 124 Bits | Score: VERY STRONG (100/100)
Estimated Offline GPU Crack Time: 4.2 Trillion Years
Pattern Warnings: None (High Entropy Passphrase)

Important Technical Details & Security Standards

• zxcvbn Password Strength Engine: Uses Dropbox zxcvbn pattern matching library for realistic entropy estimation.
• Multi-Scenario Crack Time Estimation: Estimates crack times for online throttling (100/hr), online fast (10/sec), and offline GPU hashing (10^10/sec).
• 100% Local Privacy: Passwords are typed directly into client memory—zero keystrokes are transmitted to servers.

Related Security & Crypto Tools

• Diceware Passphrase Generator: Generate high-entropy passphrases.
• Token Generator: Generate secure random tokens.
• Bcrypt Generator: Hash passwords with Bcrypt.