The Perfect Home Assistant Password

Sun, 13 Jul 2025 00:00:00 +0200

Imagine it’s the middle of the night and suddenly your smart speaker blasts music at full volume. The lights are flashing like crazy, and your heating turns itself up to maximum. At first you think it’s a technical glitch — but then you realize: someone else has taken control of your smart home!

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What sounds like a horror scenario isn’t actually that far-fetched. Users in the Home Assistant forum have shared their experiences:

A user reported in 2018 that their system was controlling lights without authorization — they had Home Assistant running with an open HTTP port and no password
Another case from January 2025: Immediate and massive login attacks right after opening the default port 8123

The alarming reality: According to recent studies, over 80% of all successful cyberattacks are attributed to weak or reused passwords (source: World Economic Forum/LastPass, 2023). Using services like Shodan, attackers find open smart home instances within seconds. The result: someone connects to your Home Assistant installation and — at best — just plays a prank like this.

That’s why a strong password for Home Assistant is absolutely critical. Unfortunately, many people still use trivial passwords that are easy to remember but just as easy to guess. And here’s what makes Home Assistant special: there is no built-in password policy. No requirements for how long or complex your password must be.

A serious mistake? On the contrary! I’ll explain why this is actually a good thing — and why the perfect Home Assistant password isn’t the same for everyone.

What Makes a Good Password?

You’ve probably rolled your eyes more than once when a site demanded “at least 8 characters, one uppercase letter, one number, and a special character.” Many people assume a password is automatically secure just because it looks complicated — but that’s not quite right. What really matters is entropy — how unpredictable and extensive the character combination is. And the rule here is: length beats complexity.

A long password with 20 characters is generally far more secure than a short one with 8, even if the shorter one contains every possible special character. Why? Because each additional character exponentially increases the number of possible combinations — and that’s worth more than a wide variety of character types.

A practical example:

Home123! dutifully meets all complexity rules and looks “secure” at first glance
In reality, many people follow exactly this pattern — a word with a capital letter, the number sequence 123, and an exclamation mark at the end
Passwords like this can be cracked very quickly or guessed through dictionary attacks
myhomeassistantisawesome would take years to crack, even though it uses only lowercase letters

➡️ Test it yourself: howseecureismypassword.net

Sources:

NIST SP 800‑63B (PDF) – See Section 5.1.1.2: No more mandatory regular password changes + focus on length over complexity.
NCSC: Problems forcing regular password expiry – Warns against cyclic password changes as they lead to predictable patterns.
The Guardian: Rejoice! The charade of having to change our passwords every few months is coming to an end – Reports on NIST & NCSC guidelines against frequent password changes and in favor of passphrases.

The Problem with Password Policies

Those seemingly “complicated” passwords can actually end up being insecure because they follow predictable patterns. Strict password policies often mislead users and tempt them into reusing passwords. Be honest: when you had to fight your way through an annoying password policy, didn’t you just reach for your standard password that ticks all the boxes?

You’re not alone — the numbers are alarmingly clear:

89% know that password reuse is risky, but only 12% use a unique password for every account (source: Spacelift, 2025)
62% of US users report frequently or always reusing passwords (source: NordPass, April 2025)
Especially striking for Gen Z: 72% reuse passwords even though 79% know the risk (source: Bitwarden World Password Day, 2025)
Even after data breaches, 59% of Gen Z recycle their passwords (source: HelpNetSecurity, May 2025)

This is a genuine internal conflict: we know what’s right, but act differently out of convenience or habit. Experts call this a cognitive dissonance between knowledge and behavior.

The Better Alternative: Passphrases

Current recommendations are clear: forget complexity requirements — what counts is length and uniqueness.

In plain terms: use a long passphrase you can actually remember, rather than cryptic eight-character gibberish. You may know the famous xkcd comic on this — four simple words like “correct horse battery staple” together form a nearly uncrackable password that you can still remember fairly easily.

What matters:

Length
Randomness
Uniqueness

Every additional character makes your password exponentially stronger. And of course it shouldn’t be a known word or pattern — “Password123!” is long and looks complex, but it’s still guessed quickly.

Specifics for Home Assistant

Let’s get concrete about Home Assistant: what role do passwords actually play here? Home Assistant is your self-hosted smart home hub. You set up user accounts and assign passwords for logging into the web frontend — and with that, full access to all devices connected to your Home Assistant.

Important: Home Assistant does not dictate what your passwords should look like. There’s no minimum length, no special character requirement, nothing of the sort. And that’s intentional. There used to be a warning when a password was too short. These warnings no longer exist — the developers realized it wasn’t productive. Why?

The requirements for a password depend heavily on the specific use case:

When I record videos for this channel, I’m always glad I don’t have to set a complex password for Home Assistant test instances
Someone who never exposes their smart home to the internet and has no guests on their home network can afford lower password requirements
A Home Assistant installation that is publicly accessible on the internet is subject to completely different standards

With Home Assistant, you are the administrator and must take responsibility yourself. If you’re not comfortable with that, a password manager is probably the best choice for you.

The moment your system is online, it becomes a potential target for automated attacks. And then things get serious fast. Home Assistant does have a built-in brute-force defense (Wikipedia article): after a certain number of failed login attempts, the user’s IP address is temporarily blocked. That’s helpful, but not a cure-all:

Many attackers simply spread their attempts across many different IP addresses
A weak password is often guessed after just a few tries
The IP block therefore offers only limited protection

Additional risks: Even Home Assistant with Nabu Casa has had critical security vulnerabilities — in 2023, a flaw (CVE-2023-27482) with the highest severity score of 10/10 was disclosed, enabling an authentication bypass.

➡️ More on securing Home Assistant: Home Assistant absichern: 5 Tipps für mehr Sicherheit

➡️ Why port forwarding is problematic: Portfreigaben vermeiden: So geht sicherer Fernzugriff

Conclusion

There is no single perfect Home Assistant password — it depends on your use case. But the numbers speak clearly: over 80% of all cyberattacks succeed through weak or reused passwords. At the same time, 89% of people know the risk, yet only 12% act consistently.

What matters:

Length over complexity: A long password is better than a short complex one
Uniqueness: Every system gets its own password — no exceptions!
Proportionality: Match your security requirements to your setup
Additional measures: When internet-facing, use 2FA and secure connections
Use a password manager: This breaks the cycle of password reuse

The solution is simple: A long passphrase or a password manager. That puts you in the 12% who do it right — rather than the 62% who accept security risks out of convenience.

Home Assistant gets it right by putting the responsibility in your hands. Use that freedom wisely!

A look ahead: The next generation of authentication is passkeys — a passwordless technology based on cryptographic keys that is significantly more secure than traditional passwords. Unfortunately, Home Assistant does not yet support passkeys, but the future of authentication may well head in that direction. Until then, strong, unique passwords and 2FA remain our best defense.

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― Joachim

Password on Smart Home? Sure — But Secure!

The Perfect Home Assistant Password

What Makes a Good Password?

Sources:

The Problem with Password Policies

The Better Alternative: Passphrases

Specifics for Home Assistant

Conclusion