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Password Strength Checker

Overview

This project is a Python-based password strength checker designed to help users create secure passwords that adhere to cybersecurity best practices. The program evaluates passwords against a set of criteria recommended by the Cybersecurity and Infrastructure Security Agency (CISA) to ensure they are strong and resilient to attacks.

Features

  • Common Password Check: Verifies the password against a list of 10,000,000 common passwords to avoid easily guessable passwords.
  • Strength Validation:
    • Ensures a minimum length of 16 characters.
    • Requires at least one uppercase letter.
    • Requires at least one digit.
    • Requires at least one special character, including `!@#$%^&*()_+-=[]{}|;:'",.<>?/~``.
  • Detailed Feedback: Provides clear messages to guide users in creating stronger passwords.
  • Error Handling: Detects missing or inaccessible password files and alerts the user.

How It Works

  1. The program reads a text file containing common passwords and stores them in a set for fast lookups.
  2. It evaluates the user's password against:
    • Common passwords.
    • Length and complexity requirements (uppercase letters, digits, special characters).
  3. Provides feedback indicating whether the password is strong or suggests improvements.

Usage

Requirements

  • Python 3.12.8 installed on your system.

Steps to Run

  1. Clone the repository
  2. Navigate to the project directory
  3. Run the program
  4. Enter a password when prompted, and the program will provide feedback

Key Technologies

  • Python
  • Regular Expressions (Regex)
  • File I/O
  • Data Structures (Set)