Password Security: How to Create Strong Passwords and Why It Matters

In a world where the average person has over 90 online accounts, password security has never been so important — and so neglected. Recent research shows that "123456" remains the most used password in the world, followed by "password" and "123456789". If you use any of these passwords or simple variations of them, this article might be the most important thing you read today.

Why are weak passwords dangerous?

When we say a password is "weak", we refer to how easily it can be discovered using automated methods. There are basically three types of attacks against passwords:

Brute force attack: The computer tests all possible combinations, starting with "a", "b", "c"... to "aa", "ab"... and so on. A 6-character password using only lowercase letters has 308 million combinations — a modern computer cracks this in seconds. Add uppercase letters, numbers, and symbols, and the combinations jump to billions.

Dictionary attack: Instead of trying all combinations, the attacker uses a list of common words, names, dates, and passwords leaked in previous breaches. If your password is "mary2023" or "football", it will be found in minutes.

Credential stuffing: Hackers use email/password combinations leaked from one site to try to access other sites. If you reuse passwords, a single leak compromises all your accounts.

Anatomy of a strong password

A truly secure password needs to have these characteristics:

Minimum length of 16 characters. Length is the most important factor. Each additional character exponentially multiplies the number of possible combinations. An 8-character password with letters, numbers, and symbols has about 6 quadrillion combinations. A 16-character one has 3.4 × 10^31 — a number so large that it would take millions of years to crack using brute force.

Mix of character types. Use uppercase letters (A-Z), lowercase letters (a-z), numbers (0-9), and special symbols (!@#$%^&*). The greater the variety, the larger the search space an attacker has to cover.

True randomness. The human brain is terrible at generating random sequences. We tend to choose patterns (qwerty keyboard, number sequences) and predictable substitutions (@ instead of "a", 3 instead of "e"). Cryptographic password generators use true entropy sources to generate genuinely unpredictable combinations.

Uniqueness. Every account must have a unique password. Reusing passwords is the digital equivalent of using the same key for your house, car, office, and safe.

Techniques to manage many passwords

"But how am I going to remember 90 different 16-character passwords?" The answer is: you don't have to. Use a password manager (like Bitwarden, 1Password, or KeePass). These programs store all your passwords in an encrypted vault, protected by a single strong master password. You only need to memorize one password — the manager's — and it handles the rest.

If you prefer not to use a manager, the passphrase technique is an alternative: combine 4-5 random words into a meaningless sentence, such as "giraffe-piano-cloud-chocolate-42". This approach creates long passwords that are hard to crack and relatively easy to memorize.

Two-Factor Authentication (2FA)

Even the strongest password in the world can be compromised by phishing or leaks. This is why two-factor authentication (2FA) is essential. With 2FA, even if someone discovers your password, they will need a second factor (code on your phone, USB key, biometrics) to access your account. Enable 2FA on all accounts that offer it — especially email, banking, and social networks.

How ZeroTools generates secure passwords

Our Password Generator uses the browser's Web Crypto API to generate cryptographically secure random numbers. Unlike traditional Math.random() functions (which are predictable), the Crypto API uses operating system entropy sources to ensure true randomness. You can customize the length, character types, and exclude ambiguous characters. And like everything on ZeroTools, passwords are generated 100% in your browser — they are never transmitted or stored on any server.