Password Strength Meter

Password security is a fundamental aspect of digital data protection in today's era. As our lives become increasingly digitized, the number of online accounts we manage grows exponentially: emails, social networks, online banking, e-commerce platforms, streaming services, and many other services require the creation of passwords. Unfortunately, many users continue to use weak and easy-to-guess passwords, such as birth dates, pet names, or simple numerical sequences like "123456". According to recent studies, more than 80% of data breaches related to hacking are due to weak or stolen passwords, which underscores the importance of creating and maintaining secure passwords.

The concept of password strength is primarily based on entropy, a term from information theory that measures the degree of uncertainty or randomness. In practical terms, password entropy depends on two main factors: length and complexity. Length is crucial because each additional character exponentially increases the number of possible combinations. For example, an 8-character password using only lowercase letters has 26^8 (approximately 208 billion) possible combinations, while a 12-character password has 26^12 (approximately 95 trillion). Complexity refers to the variety of characters used: uppercase and lowercase letters, numbers, and special symbols. The more diverse the set of characters used, the greater the entropy and, therefore, the security of the password.

Modern password attack methods are increasingly sophisticated. Brute force attacks involve systematically trying all possible combinations until finding the correct one, a process that can be extremely fast for short passwords using specialized hardware. Dictionary attacks use lists of common words, phrases, and variations (such as substituting letters for similar numbers: "p4ssw0rd" instead of "password"). Even more dangerous are rule-based attacks, which apply common password creation patterns, or rainbow table attacks, which use pre-calculated tables to decode password hashes. In response to these threats, cybersecurity experts recommend using unique passwords for each service, with a minimum length of 12 characters and a combination of all available character types.

A recommended practice for managing multiple complex passwords is the use of password managers. These tools securely store all passwords, encrypting them with a single master password. Additionally, they offer features such as secure random password generation, autocomplete in browsers and applications, and synchronization between devices. Another important security layer is two-factor authentication (2FA), which requires not only the password (something you know) but also a second factor such as a temporary code sent to your phone (something you have) or a fingerprint (something you are). The combination of strong passwords, password managers, and 2FA provides robust protection against most attacks.

Our password strength measurement tool uses advanced entropy-based algorithms to evaluate the security of your passwords. It analyzes factors such as length, the presence of different types of characters, the absence of common patterns, and character repetition. Additionally, it provides an estimate of how long it would take an attacker with modern resources to decode your password through brute force. The tool not only rates the strength of your password on a scale from very weak to very strong but also offers personalized suggestions to improve it. All evaluation is performed locally in your browser, ensuring that your password never leaves your device, which eliminates the risk of exposure to third parties. Use this tool regularly to ensure that your passwords provide adequate protection for your most valuable data and accounts.