Why Strong Passwords Matter

A strong password is your first line of defense against unauthorized access. Weak or reused passwords are among the top reasons for security breaches. Hackers often use automated tools (like brute-force or dictionary attacks) to crack passwords.

What Makes a Password Strong?

• Length: At least 12 characters is recommended
• Complexity: A mix of uppercase, lowercase, numbers, and special characters
• Unpredictability: Avoid common phrases, patterns, or dictionary words
• Uniqueness: Use different passwords for different accounts

Understanding Entropy

Entropy measures how unpredictable a password is. Higher entropy means a stronger, harder-to-guess password. Our checker estimates entropy and gives you live feedback to improve your password strength.

Simple Python Password Strength Checker

Want to test password strength in your own Python environment? Try this script:

import math

def calculate_entropy(password):
    charset_size = 0
    if any(c.islower() for c in password): charset_size += 26
    if any(c.isupper() for c in password): charset_size += 26
    if any(c.isdigit() for c in password): charset_size += 10
    if any(c in '!@#$%^&*()_+-=[]{}|;:,.<>?/' for c in password): charset_size += 32
    entropy = len(password) * math.log2(charset_size or 1)
    return round(entropy, 2)

def classify_score(entropy):
    if entropy < 20: return "Very Weak"
    elif entropy < 40: return "Weak"
    elif entropy < 55: return "Fair"
    elif entropy < 70: return "Good"
    elif entropy < 85: return "Strong"
    else: return "Very Strong"

pw = input("Enter a password: ")

entropy = calculate_entropy(pw)
strength = classify_score(entropy)

print(f"Entropy: {entropy} bits")
print(f"Strength: {strength}")
        

This script evaluates the strength based on character set variety and password length.