Password Strength Checker

Description

This Python script evaluates the strength of a password based on security best practices. It helps ensure strong password policies for applications requiring secure authentication.

Features

• Checks password strength based on:
  • Minimum length (8 or more characters)
  • Presence of uppercase letters
  • Presence of lowercase letters
  • Presence of numbers
  • Presence of special characters
• Categorizes passwords as Weak, Moderate, or Strong
• Accepts user input for real-time evaluation
• Useful for authentication systems and cybersecurity-focused projects

Usage

1. Run the script.
2. Enter a password when prompted.
3. The script evaluates the password and provides strength feedback.

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Code

import re

def check_password_strength(password):
    length_criteria = len(password) >= 16
    uppercase_criteria = bool(re.search(r'[A-Z]', password))
    lowercase_criteria = bool(re.search(r'[a-z]', password))
    number_criteria = bool(re.search(r'[0-9]', password))
    special_char_criteria = bool(re.search(r'[\W_]', password))

    criteria_count = sum([length_criteria, uppercase_criteria, lowercase_criteria, number_criteria, special_char_criteria])

    if criteria_count == 5:
        return "Strong"
    elif criteria_count >= 3:
        return "Moderate"
    else:
        return "Weak"

# Take password input from the user
password = input("Enter your password: ")
strength = check_password_strength(password)
print(f"The password strength is: {strength}")