How to Create Secure Passwords That Are Unhackable
No password is truly “unhackable,” but you can make one so resistant to cracking that breaking it would take centuries of computing power. The secret is length, randomness, and never reusing the same password twice.
What Makes a Password Strong
Attackers do not sit and type guesses. They use software that tries billions of combinations per second and dictionaries of leaked passwords. A strong password defeats both approaches through two principles:
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- Length over complexity: Each additional character multiplies the number of possible combinations exponentially. A long password beats a short one with symbols every time.
- Randomness: Patterns, names, dates, and common words are predictable. Truly random characters cannot be guessed by dictionary attacks.
A 16-character random password is exponentially harder to crack than an 8-character one, even if the shorter one has symbols. Aim for at least 16 characters.
The Passphrase Method
For passwords you must remember, such as your password manager’s master password, use a passphrase: four or more random, unrelated words strung together.
- Example structure:
correct-horse-battery-staple - Pick words at random, not a famous quote or song lyric.
- Add a number and symbol for extra strength:
purple-anchor-cloud-tango-7!
A four-word random passphrase is both easy to remember and extremely hard to crack because of its length, while avoiding the unguessable string problem of pure random characters.
Use a Password Manager for Everything Else
You cannot realistically remember a unique 16-character random password for every account, and you should not try. A password manager solves this completely.
- It generates a random, unique password for each site.
- It stores them in an encrypted vault.
- It autofills them so you never type or reuse a password.
You only need to remember one strong master passphrase. Tools like Bitwarden (free) or 1Password handle the rest. This is the single biggest improvement you can make to your password security.
Habits That Keep Passwords Secure
- Never reuse passwords: One breached site should never compromise your other accounts.
- Enable two-factor authentication (2FA): Even a stolen password is useless without your second factor. Use an authenticator app or hardware key rather than SMS where possible.
- Avoid personal information: Birthdays, pet names, and addresses are easy for attackers to find.
- Check for breaches: Use a service like Have I Been Pwned to see if your credentials have leaked, and change them if so.
- Do not write passwords in plaintext: No sticky notes, no unencrypted text files.
Passwords to Avoid Completely
These appear at the top of every cracking dictionary and offer essentially zero protection:
- Sequences like
123456orqwerty - The word
passwordwith or without numbers - Your name, username, or company name
- Simple substitutions like
P@ssw0rdthat attackers expect
Frequently Asked Questions
How long should a secure password be?
Aim for at least 16 characters. Length is the most important factor because each extra character dramatically increases the number of combinations an attacker must try. For master passwords, a four-to-six-word passphrase works well.
Is it safe to let a password manager generate my passwords?
Yes, this is the recommended approach. Password managers use strong random generators and store passwords in an encrypted vault, which is far safer than any password you could memorize and reuse.
Do I need to change my passwords regularly?
Modern guidance says no, not on a fixed schedule, since forced changes lead to weaker, predictable variations. Instead, use a long unique password per account and change it only if a service is breached.
Is two-factor authentication really necessary if my password is strong?
Yes. 2FA protects you even if your password is stolen through phishing or a data breach. It is one of the most effective security layers you can add, so enable it everywhere it is offered.
