Are Smart Locks Safe? Security Explained
Quick Verdict: Yes — a quality smart lock from an established brand is as safe as a traditional deadbolt, and in everyday use it is often safer because it removes the weakest link in home security: copied, lost, and shared physical keys. The real risks are not Hollywood-style remote hacking but mundane ones — weak keypad codes, cheap no-name hardware, and forgetting to keep a backup way in. This guide explains exactly where smart locks are strong, where they’re weak, and how to choose and use one safely. For models that get the security fundamentals right, see the Best Smart Locks (2026) guide.
The Two Halves of Smart Lock Security
Every smart lock has to defend against two completely different kinds of attack, and a lock can be excellent at one while weak at the other. Understanding the split is the key to evaluating any lock honestly.
- Physical security — can someone kick, pry, drill, or pick their way through the deadbolt itself? This is identical to the question you’d ask of any traditional lock.
- Digital security — can someone intercept the wireless signal, guess a code, or exploit the app and cloud to open the lock electronically?
The good news for buyers: both halves are well understood, both are measurable, and both are solved by reputable hardware. The trouble starts only with bargain-bin brands that cut corners on one or the other.
Physical Security: The ANSI/BHMA Grade
A smart lock is only as strong as the deadbolt under the electronics, so start with its physical rating. Residential locks are graded by ANSI/BHMA from Grade 3 (basic) to Grade 1 (highest).
A Grade 1 deadbolt is held to a demanding standard — tested to 250,000 open/close cycles and built to withstand repeated ramming blows and forced-entry attempts. In independent 2026 break-in testing, Grade 1 locks held up across simulated forced-entry attempts without failing. The Schlage Encode Plus is the headline Grade 1 smart lock.
Grade 2 locks like the Yale Assure Lock 2 and Ultraloq U-Bolt Pro are still robust and appropriate for the majority of homes. Treat Grade 2 as the sensible floor for an exterior door, and reserve Grade 1 for high-priority entrances or buyers who simply want the strongest available.
One physical caveat applies to some keyed models: an exposed keyhole can be vulnerable to lock-picking or cylinder attacks like core pulling — exactly the same weakness traditional locks have. Key-free designs sidestep this, but then you depend entirely on batteries and codes, so weigh the trade-off.
Digital Security: Encryption, Codes, and the Cloud
This is where smart locks differ from ordinary deadbolts, and where the fear-mongering headlines come from. The reality is reassuring for buyers who choose carefully.
Encryption
Reputable smart locks protect their wireless communication with AES-128 encryption or better — the same class of encryption used to secure banking and government data. Schlage’s Encode line, for example, uses AES-128. Security researchers consistently find that AES-128 with proper key exchange is effectively uncrackable with the tools an ordinary burglar would have. A thief is overwhelmingly more likely to break a window than defeat the encryption.
Where Locks Actually Fail
When security researchers do find exploitable smart locks, they are almost always cheap, no-name devices that make basic mistakes: transmitting unlock codes in plain text, using static pairing codes that never change, or having broken authentication that allows replay attacks. Even a previously respected brand can have a lapse — researchers reported a Bluetooth vulnerability in a U-Tec/Ultraloq model in 2020, the company patched it, but units had already shipped before the fix. The lesson isn’t “smart locks are unsafe”; it’s “buy established hardware that receives firmware updates, and keep that firmware current.”
The Cloud and Your App
Wi-Fi locks route some functions through the manufacturer’s cloud, which adds convenience (remote control, alerts) and a theoretical attack surface. Protect it the same way you protect online banking: a strong, unique password on your lock account and two-factor authentication wherever the app offers it. The combination of AES-128 on the lock and 2FA on the account closes the realistic remote-attack vectors for a home user.
The Real Weak Link: How You Use the Lock
Across every expert source, the same conclusion repeats: the biggest practical risk with a smart lock isn’t the technology — it’s human habits. The most common mistakes are entirely avoidable:
- Weak or obvious codes — avoid 1234, 0000, birthdays, and house numbers. Use a longer code and take advantage of anti-peep keypads (the Wyze Lock Bolt v2 has one) that let you pad the real code with random digits.
- Shared and stale codes — give each person a unique code so you can revoke one without changing everyone’s. Delete guest, cleaner, and contractor codes when they’re no longer needed.
- Skipping firmware updates — updates patch exactly the kind of vulnerabilities researchers find. Keep auto-update on.
- No backup plan — a dead battery or a lost phone shouldn’t lock you out. Keep a physical key or confirm your lock has emergency power terminals.
Smart Lock vs. Traditional Lock: An Honest Comparison
| Security Factor | Traditional Deadbolt | Quality Smart Lock |
|---|---|---|
| Physical strength | Up to ANSI Grade 1 | Up to ANSI Grade 1 (same standard) |
| Key copying / loss risk | High — keys are easily copied | Low — codes replace keys, revoke instantly |
| Remote attack surface | None | Small, mitigated by AES-128 + 2FA |
| Access logging | None | Yes — see who entered and when |
| Lockout risk | Lost key | Dead battery (keep a backup) |
| Revoking access | Rekey the lock | Delete a code in seconds |
The honest takeaway: smart locks match traditional locks on raw physical strength and clearly beat them on access control, while introducing a small, manageable digital risk that good habits neutralize.
How to Choose a Safe Smart Lock
If safety is your priority, your shopping checklist is short:
- Buy from an established brand (Schlage, Yale, August, Ultraloq, Eufy, Level, Aqara) that issues firmware updates.
- Require at least ANSI/BHMA Grade 2; choose Grade 1 like the Schlage Encode Plus for the strongest physical security.
- Confirm AES-128 (or stronger) encryption and the availability of two-factor authentication on the app.
- Prefer a model with a backup entry method — a physical key or emergency power terminals.
For help weighing these factors against price and convenience, read How to Choose a Smart Lock, and if you’re worried about losing access during an outage, see Do Smart Locks Work Without WiFi?
Frequently Asked Questions
Can smart locks be hacked?
In theory any connected device can be attacked, but in practice hacking a quality smart lock is extremely difficult. Reputable models use AES-128 encryption that researchers consider uncrackable with common tools, and the locks that have failed security testing are almost always cheap, no-name devices with poor or no encryption. For a typical home, a burglar is far more likely to break a window than to defeat the lock electronically.
Are smart locks safer than regular locks?
For everyday security, often yes. Smart locks eliminate the biggest weakness of traditional locks — physical keys that get copied, lost, or shared and never recovered. You can give each person a unique code, revoke it instantly, and see a log of who came and went. On raw physical strength they match traditional locks, since both can carry the same ANSI/BHMA Grade 1 rating.
What happens if someone steals my phone?
A stolen phone alone usually can’t open your lock, because the lock app should be protected by your phone’s lock screen and, ideally, two-factor authentication on the account. If you lose your phone, log into your lock account from another device and remove the phone’s access or change your password. This is exactly why enabling 2FA and a screen lock matters.
Do I need a physical key backup for safety?
It’s strongly recommended unless your lock has a reliable emergency power option, such as external terminals you can touch with a 9V battery. Keypad and fingerprint deadbolts from Schlage, Yale, Kwikset, and Ultraloq typically include a keyway. Key-free and retrofit designs rely on batteries and codes alone, so confirm there’s a backup plan before you commit.
What is the most secure smart lock?
For physical security, look for an ANSI/BHMA Grade 1 model — the Schlage Encode Plus is the standout, pairing Grade 1 strength with built-in Wi-Fi, AES-128 encryption, and Apple Home Key. For most homes, a Grade 2 lock like the Yale Assure Lock 2 is more than adequate when paired with strong codes and two-factor authentication.
How do I keep my smart lock secure day to day?
Use a long, non-obvious keypad code (never 1234 or a birthday), give each person a unique code and delete codes you no longer need, keep firmware auto-updates on, enable two-factor authentication on the app, and maintain a backup entry method. These habits address the real-world risks far more than any single hardware feature.
Final Verdict
Smart locks are safe — provided you buy reputable hardware and use it sensibly. The technology that matters (ANSI/BHMA Grade 2 or 1 construction, AES-128 encryption, two-factor authentication) is mature and proven, and the failures researchers find are concentrated in cheap, unbranded devices. Choose a known brand, set strong unique codes, keep firmware current, and keep a backup way in, and a smart lock will protect your door at least as well as a traditional deadbolt while giving you control a key never could. For models that meet this bar, see the Best Smart Locks (2026) guide.
Last updated: June 2026