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No. A passphrase is not inherently less secure than a password. NIST’s current guidance treats a passphrase as a form of password, so the same rules apply to both. A long, unpredictable secret is hard to guess, and a short, common, or personal one is weak no matter what it is called. The questions that matter are how long and guessable the secret is, whether you use it on only one account, whether the service accepts it in full, and whether the account has an additional protection such as multifactor authentication.
Where the myth comes from
The belief usually rests on two assumptions. The first is that a “password” means a short string of mixed characters, while a “passphrase” means a sentence that looks too simple to be strong. The second is that a secret with no symbols or capital letters must be weaker. Older policies reinforced both ideas by requiring a minimum length and a mix of character types, which made a plain phrase look like it failed the test.
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Current NIST guidance drops that model. It does not reward a secret for its character mix. It evaluates length, resistance to guessing, and whether the secret is known to be exposed. Under that standard a phrase can be the stronger choice.
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In NIST Special Publication 800-63B-4, Authentication and Authenticator Management, a passphrase is defined as a password made of a sequence of words or other text, and the standard notes that “password” is sometimes used to mean a passphrase. Read this way, the debate is largely about naming. The service checks the secret the same way regardless of whether you call it a password or a passphrase. (NIST SP 800-63B-4)
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What makes a passphrase easy or hard to guess
Length helps only when the words are hard to predict. The table below compares four kinds of secret. The examples are illustrative, not drawn from any real account.
| Example secret | Length | How it holds up |
|---|---|---|
| Password123! | 12 characters | Weak. It follows a common pattern and appears on widely used lists of common values, which NIST says verifiers should reject. |
| correct horse battery staple | 28 characters | Long but guessable. It is a widely quoted phrase, so an attacker can try it early. |
| Our dog Biscuit loves Lisbon | 28 characters | Weak in practice. It is built from personal facts that others may know or find online. |
| Four or five unrelated words picked at random, for example with dice or a password manager’s generator | Varies; keep it above the minimum for your context | Strong. The randomness, not the word count alone, makes it hard to guess. |
The pattern is consistent: a phrase is only as strong as its predictability. Length is a multiplier on that, not a substitute for it.
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Current NIST length rules
NIST’s requirements for verifiers, meaning the services that check your secret, depend on how the password is used. The figures below come from the current edition. They are requirements and recommendations for verifiers under NIST guidance, not a description of how every website is built.
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|---|---|
| Password is the single authentication factor | Minimum of 15 characters (SP 800-63B-4) |
| Password is used only as part of multifactor authentication | A verifier may allow a shorter password, but must require at least 8 characters (SP 800-63B-4) |
| Maximum length | Verifiers should permit at least 64 characters (SP 800-63B-4) |
| Earlier 2017 edition (SP 800-63B-3) | Its eight-character minimum is superseded by the 15-character single-factor minimum in the current edition. NIST’s implementation FAQ summarizes the change. |
Two counting details matter. Under NIST’s guidance each Unicode code point counts as one character, so an accented letter or an emoji counts as one. The guidance also says verifiers should support spaces and printable characters, which is why a phrase with spaces is a valid choice. NIST’s customer experience guidance explicitly encourages long secrets and spaces so that passphrases are practical.
What NIST no longer asks for
- Character-mix rules. Verifiers should not require a mix of uppercase, lowercase, numbers, and symbols. Adding a capital and a digit to a weak phrase does not fix it.
- Routine password changes. The guidance does not call for changes on a fixed schedule unless there is evidence of compromise.
- Unchecked common values. Verifiers should reject commonly used, expected, or compromised values using a blocklist. This is the check that matters most for phrases.
NIST also cautions that estimating the entropy of a user-chosen password is difficult, so no single bit count, word count, or character count guarantees safety. A phrase’s predictability and exposure decide the outcome.
What length does not protect against
A long secret does not stop every attack. NIST states plainly: “Passwords are not phishing-resistant.” The same guidance notes that keylogging, phishing, and social engineering are not solved by length or complexity. A perfect passphrase typed into a fake sign-in page is still disclosed to the attacker.
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Reuse is the other gap. NIST describes distinct secrets as important for avoiding password stuffing, in which stolen credentials from one breach are tried against other services. A passphrase used on several accounts is exposed everywhere it appears.
How to choose a passphrase
- Make it at least 15 characters if it will be your only sign-in factor, and longer where the service allows.
- Build it from unrelated words chosen at random, using dice, a password manager’s generator, or another random source.
- Leave out quotations, lyrics, book titles, names, pets, addresses, birthdays, and anything you have posted about online.
- Use a different secret for every account, so one breach does not expose the others.
- Turn on multifactor authentication wherever the service offers it.
- Store the secret in a password manager, which also removes the need to memorize dozens of strings. NIST’s guidance discusses password managers and the paste and autofill features that make them practical.
When a site will not accept a passphrase
- It rejects spaces. NIST’s verifier guidance says spaces should be supported. If a service refuses them, it falls short of that guidance. Choose a random secret the site accepts, and keep the rest of your accounts on passphrases where they are allowed.
- It has a low maximum length. If a field truncates silently, the stored secret can be shorter than the one you typed. Keep the phrase within the limit the site states, then log out and back in once to confirm it works before you rely on it.
- It insists on a symbol or capital. That is a composition rule that NIST does not require. If you cannot avoid it, make the rest of the secret long, random, and unique, and enable multifactor authentication.
- It blocks pasting. Use your password manager’s autofill where possible. Whichever method you use, the secret still needs a safe place to be stored.
Phishing-resistant sign-in
Because passwords and passphrases cannot resist phishing on their own, the next step is an authenticator designed for that threat. NIST’s authenticator guidance lists passkeys among the current authenticator types. A FIDO2 security key is a hardware option for accounts that support it. Neither makes a passphrase stronger. They change what an attacker can capture during sign-in. Availability depends on each service, so check the security settings of your own accounts to see which options they offer.
The bottom line is that a well-chosen passphrase, kept unique and paired with multifactor authentication where possible, is a sound choice. Calling it a passphrase does not make it weaker.
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