Are smart locks safe from hacking? The honest answer is: yes, with caveats. Modern smart locks use the same encryption standards that protect online banking. The real vulnerabilities aren’t in the encryption — they’re in how people set them up, what apps they use, and which protocols the lock relies on.
I’ve installed hundreds of smart locks across residential and light commercial properties. Clients ask me this question almost every time. What follows is what I tell them: the actual threat model, the real vulnerabilities, and how to evaluate whether a specific lock is worth trusting.
How Smart Lock Encryption Actually Works
Most name-brand smart locks use AES-128 or AES-256 encryption for data transmission. AES-256 is the same encryption standard used by the U.S. government for classified communications. Breaking it by brute force would take longer than the age of the universe with current computing power. The encryption itself is not the problem.
The communication protocol matters though. There are three main ones you’ll encounter:
- Bluetooth Low Energy (BLE): Used by August, Schlage Encode Plus, and others. Range is short (about 30 feet), which limits attack surface. Rolling authentication codes mean a captured signal can’t be replayed to unlock the door.
- Z-Wave S2: The most secure protocol for smart home locks. Used in Schlage’s Z-Wave variants and compatible with most security hubs. S2 includes encrypted key exchange and prevents relay attacks.
- Wi-Fi direct: Used in some budget locks. More convenient but exposes the lock to your home network and, by extension, any vulnerabilities in your router or connected devices.
Zigbee sits somewhere in between — widely used, reasonably secure when properly implemented, but protocol security depends heavily on the hub and firmware.
The Actual Attack Vectors (What You Should Actually Worry About)
The scariest-sounding attacks against smart locks are also the rarest. Signal jamming, relay attacks, and Bluetooth sniffing exist in security research papers. They also require specialized hardware, proximity to your door, and a motivated attacker who has specifically targeted your lock. That’s not how residential burglaries work.
The real vulnerabilities in real-world smart lock security are much more mundane:
Weak or Reused Access Codes
Keypad smart locks let you set entry codes. A surprising number of homeowners use “1234,” their birth year, or the same code they use for their garage. Anyone who’s watched you enter the code once — a delivery driver, a contractor, a neighbor’s kid — can get in. Change codes regularly and use something non-obvious.
Unrevoked Guest Access
Smart locks make it easy to grant temporary access. They also make it easy to forget you granted it. A plumber you let in eight months ago may still have an active code or a digital key on their phone. Audit your access list every 90 days minimum.
Compromised Phone or Account
If your August or Schlage account uses a weak password, no two-factor authentication, and your email is compromised — someone can unlock your door remotely. This isn’t a lock vulnerability. It’s an account security vulnerability. The solution is the same one you should be using for every important account: strong unique password plus 2FA.
Outdated Firmware
Smart lock manufacturers push firmware updates to fix discovered vulnerabilities. A lock that hasn’t updated its firmware in two years may be running software with known exploits. Enable auto-updates if the lock supports them.
Are Smart Locks Safer or Less Safe Than Traditional Locks?
This is the right question, and the answer surprises most people: smart locks are generally at least as safe as traditional deadbolts, and in some ways safer.
Traditional deadbolts are vulnerable to lock picking, bump keys, and key duplication. Anyone who’s lived in your house before you could have copies of your key. Smart locks eliminate the physical key problem entirely — you can’t duplicate a Bluetooth credential the way you can a key blank at a hardware store.
Smart locks also give you an audit log (who unlocked what and when), the ability to revoke access instantly, and remote locking if you forgot. Those are security advantages a traditional lock can’t offer.
The best smart locks for front doors today are engineered to meet ANSI/BHMA Grade 1 standards — the highest residential security rating — while also handling the digital security side correctly.
Which Smart Locks Have the Best Security Track Record
Brand matters. The locks that have consistently held up under security research scrutiny:
- Schlage Encode Plus: Apple Home Key compatible, AES-128 Bluetooth, ANSI Grade 1 hardware. No known significant exploits in public security research. Around $250.
- Schlage Connect (Z-Wave S2): The gold standard for security hub integration. Z-Wave S2 protocol with strong key exchange. Works with SimpliSafe, Ring, and most professional systems. Around $200.
- Yale Assure Lock 2: Matter-compatible (the new open standard that requires rigorous security certification), solid track record, Z-Wave and Zigbee options. Around $180–250.
- August Smart Lock Pro: Solid BLE implementation, actively maintained firmware, good security research disclosure history. Around $200.
Locks I’d avoid from a security standpoint: no-name brands on Amazon with vague encryption claims, anything running purely on Wi-Fi without proper network isolation, and older locks running firmware that’s no longer supported by the manufacturer.
The Question That Actually Matters
Before worrying about whether someone is going to hack your Schlage, ask yourself: how strong is the door frame it’s mounted in? How solid is the deadbolt throw? Is there a window next to the door they could break instead?
Physical attacks — kicking in a door, breaking a window, forcing a weak frame — account for the vast majority of actual residential break-ins. Sophisticated wireless attacks on smart locks account for essentially zero in any crime statistics I’ve seen.
Smart lock security matters. But it’s worth keeping in perspective: if your door frame has 1.5-inch screws in the strike plate and your neighbor’s door frame doesn’t, the smart lock comparison is academic. Start with your overall home security fundamentals, then worry about encryption protocol nuances.
Bottom Line
Smart locks from reputable brands are safe. The encryption is solid. The real risks are operational: weak codes, stale guest access, and compromised accounts. Fix those and a quality smart lock is as secure as any deadbolt — with meaningful advantages in access management and audit capability.
If you’re integrating a smart lock with a home security system, make sure it’s protocol-compatible — many security systems support Z-Wave or Zigbee locks directly, which is cleaner than running a separate app. And read the firmware update policy before you buy: a lock the manufacturer has already stopped supporting is a lock whose security posture will only get worse over time.
How to Evaluate a Smart Lock Before You Buy
Not all smart locks are equally secure. Before committing to a model, here is what I check:
Protocol and encryption standard. Look for Z-Wave S2 or Bluetooth with rolling codes for the most security-conscious installations. Avoid locks that only document “AES encryption” without specifying the key exchange protocol — the handshake is where most real vulnerabilities live.
Physical security rating. A smart lock on a weak deadbolt is still a weak deadbolt. Look for ANSI/BHMA Grade 1 or Grade 2 certification — these ratings test physical resistance to kicking, drilling, and prying, independent of electronic security. Grade 1 is commercial-grade; Grade 2 is solid for most residential applications.
Manufacturer update track record. Check how frequently the manufacturer pushes firmware updates and whether they have a public security disclosure policy. Schlage and Yale have both patched documented vulnerabilities with timely updates. Brands that have not issued a firmware update in two years are a red flag.
What happens when power fails. Mechanical key backup is standard on most quality locks but not all. Verify that the lock has a physical key override. For locks without battery backup, know the procedure for emergency entry before you need it at midnight with dead batteries.
Are cheap smart locks less secure?
Often, yes — but not always in the ways you expect. Budget smart locks sometimes cut corners on physical deadbolt quality (lower-grade materials, thinner bolt throws) while using the same BLE or Z-Wave protocols as premium options. The electronic security may be similar; the physical resistance to attack is where budget locks fall short. The ANSI/BHMA grade certification is the fastest way to assess physical quality regardless of price point.