🛡️ Password Strength & Security Logic Analyzer

This project is a deep dive into Backend Logic and Security Algorithms using C#. While it uses Windows Forms for the interface, the primary focus was to build a robust engine that can accurately evaluate password complexity beyond just checking the length.

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🧠 Philosophy: Logic Over UI

In this project, I intentionally kept the User Interface simple and clean. The goal was to dedicate 100% of my focus to the Underlying Logic. I wanted to ensure that the scoring system is accurate, the common password detection is efficient, and the "Time-to-Crack" estimation is based on real-world entropy principles.

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🚀 Key Technical Features (The "Brain" of the App)

• 🔍 Common Password Detection: A built-in dictionary check to flag frequently used (and insecure) passwords like 123456, admin, or password.
• 📊 Advanced Scoring Engine: The logic evaluates four main criteria:
  • Character Variety (Uppercase, Lowercase, Numbers, Symbols).
  • Minimum & Optimal Length requirements.
  • Unique Character Ratio (to prevent repetitive patterns).
• ⏳ Time-to-Crack Estimation: A complex algorithm that estimates how long it would take for a brute-force attack to break the password, providing a reality check for the user.
• 🎨 Dynamic Feedback Logic: The UI reacts instantly to every keystroke, but the magic happens in the background where the logic recalculates the "Strength Level" and "Security Color" in real-time.

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🛠 How the Logic Works

The core of the program resides in CheckStrength() and CalculateTimeToCrack() methods:

1. Initial Filter: Checks if the password is in the "Common Passwords" list.
2. Point Accumulation: Grants points for each security layer (e.g., adding a symbol adds X points).
3. Entropy Calculation: Uses the character set size and password length to determine the mathematical difficulty of cracking it.
4. Final Evaluation: Maps the final score to 5 levels: Very Weak, Weak, Medium, Strong, Very Strong.

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📂 Technical Stack

• Language: C#
• Framework: .NET WinForms (used as a shell for the logic).
• Paradigm: Procedural Logic & Event-Driven UI.

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🚀 How to Run

1. Clone the repo.
2. Open PasswordStrengthChecker.sln in Visual Studio.
3. Press F5 to build and run the logic analyzer.

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👨‍💻 Author

Mohamed Ragheb Focusing on the core logic to build more secure and efficient software.

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If you value backend logic and algorithm design, feel free to give this repo a ⭐!