🔐 Advanced Password Strength Analyzer

A Python-based security tool that evaluates password strength, estimates crack time, detects password reuse, and suggests stronger alternatives using cryptographic techniques.

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📌 About

This tool was built to demonstrate real-world password security concepts including entropy calculation, hash-based reuse detection, and brute-force resistance estimation — key concepts in cybersecurity and secure application development.

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✨ Features

• ✅ Password Strength Rating — Weak / Medium / Strong
• ✅ Entropy Calculation — Measures randomness in bits
• ✅ Crack Time Estimation — Estimates time to brute force
• ✅ Password Reuse Detection — Uses SQLite + SHA256 hashing
• ✅ Common Password Detection — Flags weak common passwords
• ✅ Complexity Analysis — Checks uppercase, lowercase, digits, special characters
• ✅ Strong Password Generator — Suggests 3 secure random passwords
• ✅ Security Feedback — Provides improvement suggestions

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🛠️ Technologies Used

• Python 3
• SQLite3 (password history database)
• Hashlib (SHA256 password hashing)
• Regex (pattern matching)
• Math (entropy calculation)
• Random + String (password generation)

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🚀 How to Run

# Clone the repository
git clone https://github.com/Balmani12/password-strength-analyzer

# Navigate to folder
cd password-strength-analyzer

# Run the tool
python Password_Strength_Analyzer.py

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📊 Sample Output

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        ADVANCED PASSWORD STRENGTH ANALYZER
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Enter your password: MyP@ssw0rd123

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PASSWORD SECURITY REPORT
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Password Strength    : STRONG
Password Length      : 13 characters
Password Entropy     : 77.63 bits
Estimated Crack Time : 3074 years

Excellent password security practices detected.

[+] Password hash securely stored in database.

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🔐 Security Concepts Covered

• Password Entropy — Measures unpredictability of a password
• SHA256 Hashing — Secure one-way password storage
• Brute Force Resistance — Time estimation based on entropy
• Password Reuse Prevention — Database-backed hash comparison
• OWASP Password Guidelines — Length, complexity, uniqueness

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📚 What I Learned

• Cryptographic hashing with SHA256
• Password entropy and brute force mathematics
• Secure password storage using hashing (never plaintext)
• SQLite database integration in Python
• Real-world password security best practices

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👨‍💻 Author

Balmani

• 🔗 LinkedIn: linkedin.com/in/bal-mani-7457a11ba
• 🐙 GitHub: github.com/Balmani12
• 🎯 TryHackMe: tryhackme.com/p/balmani