Imagine this: you’re heading out the door, dragging groceries in, and you tap an app to lock your house behind you. No key needed. That’s the promise of smart locks, the sleek tech upgrade to the old mechanical deadbolt. But ask yourself: if a lock connects to the internet or your phone, doesn’t that also open it up to digital threats? So the big question: can smart locks actually keep hackers out?
What a smart lock actually is
When we talk about smart locks, we’re referring to digital-or electro-mechanical devices that replace or supplement a regular lock on your door, and allow you to unlock or monitor access using methods like smartphone apps, PIN codes, biometrics, or voice commands.
They often communicate via Bluetooth, WiFi, NFC, or other wireless protocols and tie into your home’s smart-system or app. They also frequently offer conveniences you can’t get with a traditional key: temporary access codes for guests, unlocking remotely, logs of who entered when, and integration with smart home setups.
In short, smart locks bring more convenience, and on paper more control. But that control also brings new potential vulnerabilities.
The benefits: why people choose them
If you’re considering a smart lock, you’re probably drawn to a few big advantages. Here’s what stands out in real life:
- No more hiding a spare key under the doormat or worrying about someone copying your key.
- Giving access to a friend, cleaner, or pet-sitter without handing over your key; you send a code or app access instead.
- Receiving notifications: someone unlocked your door, or an unfamiliar code was used. That gives you real-time visibility you wouldn’t have with a standard lock.
- Integration: locks that tie into your home automation system, so you might have your door lock automatically when you arm your alarm system, or unlock when your car approaches, etc.
- The psychological feeling of being “modern” and in control of your home security.
So yes: smart locks can improve your home’s security posture — if things are set up well.
What hackers can exploit
Here’s where we dig into the “can they be hacked” question. The short answer is: yes, they can. No security system is invulnerable. Here’s how things can go wrong.
Wireless vulnerabilities
Smart locks that rely on Bluetooth or WiFi connections open up digital entry points. For instance researchers have shown that Bluetooth-enabled locks can be susceptible to “replay attacks” where a hacker records a valid unlock signal and later replays it to gain entry.
WiFi-connected locks that communicate via cloud services or mobile apps can be attacked via weak passwords, insecure APIs, or compromised manufacturer servers.
Weak encryption or outdated firmware
If a smart lock uses poor or outdated encryption, or the firmware is no longer supported by the manufacturer, the risk grows. Smart locks worth buying should support strong standards (for example AES-128 or AES-256 encryption).
Physical/side-channel vulnerabilities
Smart locks might still have mechanical or structural weaknesses. Some models can be forcibly turned or bypassed by manipulating internal components, even though they’re “smart”. There are reports of magnets, physical jostling or poorly designed deadbolts doing the job.
Smart home ecosystem risk chain
Because a smart lock usually integrates with your smartphone, your WiFi, maybe a smart hub — each link in that chain is a potential failure point. If your phone is compromised, or your smart home hub is hacked, the lock might be the next target.
The harsh truth: no lock is 100% hack-proof
One article puts it plainly: “Any device that works and can be accessed at any time via the Internet can be at risk of being hacked.”
That doesn’t mean smart locks are inherently bad — far from it. It means you need to understand how to reduce risk.
So how much safer are smart locks than traditional ones?
To answer this, let’s compare. Traditional locks have their own weaknesses: key duplication, lock-picking, bumping, breaking down the door around them. Smart locks shift the threat model: yes some mechanical weaknesses remain, but now digital threats also enter the picture.
In many cases, a well-chosen smart lock with good installation plus good usage habits will offer better real-world security than a cheap mechanical lock that can be bumped or picked. Especially if you value monitoring, logging and remote access.
On the other hand, if you install a cheap smart lock with weak security, do not change the default password, do not update the firmware, and treat it like it’s a “plug-and-forget” device — you may actually be worse off.
Ultimately the question isn’t whether smart locks can keep hackers out (they can) but whether you will choose a lock, install it well, use it wisely and keep it maintained.
What to look for when choosing a smart lock
Here are practical criteria you should keep in mind, explained in everyday language.
Strong encryption and security protocols
Make sure the manufacturer states clearly the encryption used (look for AES-128 or AES-256). The communication between your phone/app and the lock should be secured. If that’s missing or vague, skip it. diysmarthomesolutions.com+1
Reliable manufacturer and updates
Choose a brand with a good reputation, clear update policy, and firmware updates for security. The lock should not be “abandonware” after a year.
Local override / hybrid option
Even the best electronic setup may fail (battery dead, network down). A lock that still allows a physical key or manual override gives you resilience. Some users feel more comfortable with “app unlock” plus key backup.
Solid mechanical hardware
Don’t ignore the “bolt strength” of the door and frame. The lock may be smart but if your door can be kicked in, the lock doesn’t matter. Look for locks with good build, strong deadbolts and secure installation. Some manufacturers rate according to ANSI Grade or equivalent.
Secure access control features
Does the app offer 2-factor authentication (2FA)? Can you create temporary access for guests? Does the lock log entries and notify you? These add real value.
Smart home ecosystem caution
If your smart lock will connect to a hub or voice assistant, know that the weakest link may be the hub or the voice interface. If you are integrating deeply, make sure the other components are also secure.
How to use your smart lock safely
Even the best lock needs good habits to really keep hackers out. Think of the technology and the behaviour as a team.
Use strong, unique passwords for your lock’s app and account. Avoid simple PINs like “1234” or “0000”.
Enable two-factor authentication whenever possible. This adds a second verification (for instance a code sent to your phone) in addition to the password.
Regularly update the firmware for the lock and its companion apps. Many vulnerabilities are fixed by updates.
Secure your WiFi network: use strong encryption (WPA2 or WPA3), a strong password, and if your home has many smart devices you might even create a separate network for IoT devices.
Be cautious with remote access: If you access your lock over the internet, know that it opens a pathway. If you don’t need remote unlocking, you might disable that or restrict it.
Review user permissions: If you grant access codes to guests (cleaners, friends), set expiry, remove access when no longer needed. Monitor logs for unusual activity.
Physical security still counts: Make sure doors and frames are strong, there is no easy way for someone to just kick the door in or tamper with the lock housing.
Be aware of the ecosystem: Your phone, your smart home hub, your internet router — these are all part of the chain. If one is compromised, your lock may indirectly be at risk.
What could go wrong and what you can do
Let’s walk through a few “what ifs” to bring this to life.
What if someone hacks your WiFi and gets into the lock app?
If your phone and lock app share credentials and you use the same password elsewhere, the attacker could gain control. By using unique passwords, enabling 2FA, and ensuring your WiFi and router are secure, you reduce this possibility significantly.
What if the lock’s Bluetooth signal is spoofed?
Some smart locks using Bluetooth have been shown to be vulnerable to attackers replaying or spoofing signals. In that case a strong encryption scheme and kept-up firmware help. And choosing a lock that uses multiple authentication factors (not just Bluetooth) adds safety.
What if a mechanical override still exists and a burglar exploits that?
If the smart lock has a physical key cylinder and that’s weak (or leaves the lock vulnerable to picking/bumping), you might face a traditional break-in. This is one reason to pick a lock with strong mechanical components in addition to smart features. Some owners pair the smart lock with a separate traditional deadbolt for night time or when away.
What if the manufacturer stops updating the firmware?
Then any newly discovered vulnerability remains open. Your lock may function perfectly, but technically could become increasingly risky. That’s why one of the biggest criteria is manufacturer reliability and update policy.
Can smart locks really keep hackers out?
Yes, they can. If you choose a good one, install it properly, keep it updated, secure the network and adopt proper habits—they offer real improvements in control, convenience and monitoring over traditional locks.
But they won’t magically fix all security risks. They introduce new ones (digital ones) alongside the old ones (physical ones). So the answer is conditional: they are strong tools, not magic shields.
If you rely on one because it’s “smart” but ignore everything around it, you might find yourself less secure than you think. On the other hand, if you treat the smart lock as one part of a smart home security system — with strong doors, good network hygiene, good user behaviour — then yes, they are worthwhile.
As one user put it on Reddit:
“Smart locks serve to deter and monitor whether the door is open… If you already have more devices like in my case … I’d only get compliant ones purely for insurance.”
Meaning: choose well, keep it maintained, and don’t rely on the idea alone.
What’s the future of smart-lock security?
The field is evolving. Smart lock makers are commercializing more advanced authentication (fingerprint, facial recognition, UWB, NFC) to reduce reliance on codes or remote apps. For example, some models support tap-to-unlock with phones using Apple Home Key or Android equivalents.
We can expect deeper integration with smart homes and more automation, but also new threats: IoT (Internet of Things) devices will continue being targeted, cloud services will be under pressure, and regulatory or certification standards may emerge. Research is already showing advanced attack vectors: e.g., wireless fingerprint theft via smart locks in studies. arXiv
The takeaway: staying safe means staying current. What’s secure today may be vulnerable tomorrow. But that doesn’t mean you skip smart locks — it means you stay informed, stay updated.
Final thoughts
You’ve weighed the benefits and the risks. You’ve explored how smart locks work, what can potentially go wrong, and what you need to look for. If I were giving advice: treat your smart lock like any important security device — set it up thoughtfully, maintain it, use good practices, and don’t assume “smart = invincible”.
If you do that, then yes, a smart lock can help keep hackers out and also make your life a bit easier. If you don’t, then you might end up with false confidence.
