The question behind every door
Every security system has to answer one question repeatedly: is this person allowed to be here? Identity verification is how it answers. It covers the way a system confirms that a person is who they claim to be before it disarms, unlocks a door or grants access to a camera feed.
The strength of everything else rests on this. A well-designed alarm and a sturdy lock offer little if a code is known to everyone who ever lived or worked in the building.
Three ways to verify
Verification is commonly described as relying on something a person knows, has, or is.
- Something you know: a PIN or passcode typed at a keypad or entered in an app.
- Something you have: a key fob, access card, phone, or physical key.
- Something you are: a fingerprint or face, covered under biometric authentication.
Using two of these together, such as a card plus a code, is often called multi-factor verification and is harder to defeat than any one alone. Many systems and accounts offer two-factor authentication; turning it on where available is a simple improvement.
PINs and codes
Codes are the most common method, and they are convenient. They are also easy to share, guess, or observe. A few habits help:
- Avoid obvious codes such as birthdays, repeated digits or simple sequences.
- Give each person their own code if the system allows it, so the log shows who armed or disarmed. Shared codes make this impossible.
- Change the default installer or master code on a new system.
- Use temporary or scheduled codes for cleaners, contractors, dog walkers and guests, with an end date where possible. Good keypad entry habits include reviewing these codes regularly.
- Treat the code like a password: do not write it on the panel or the door frame.
If a code is used to cancel an alarm under pressure, some systems support a separate duress code, which appears normal but quietly sends a signal for help. Whether and how this works depends on the equipment and any monitoring arrangement, and it should be tested.
Credentials and tokens
Cards, fobs and phones can be assigned to individuals and disabled individually, which is a big advantage over a shared code. Lost items should be reported and deactivated at once. Cards and fobs can sometimes be copied, depending on their type, so ask the installer what kind of credential a reader uses and whether it is considered robust. For a business, managing employee credentials is an ongoing task, not a one-time setup.
Keys deserve the same thought. Physical keys are credentials too, and unless they are tracked, no one knows how many copies exist; good key control addresses that problem.
Visitors and deliveries
Not everyone who needs access is a regular user. Visitors, tradespeople and delivery staff are better handled through a separate process than by handing out a code:
- A video intercom or doorbell lets you see and speak to someone before deciding whether to open the door.
- A sign-in step at a business reception, and a visitor badge, help staff know who is on the premises.
- Asking to see identification or confirming appointments with the company they claim to represent can prevent impersonation.
- Never rely on a uniform alone, and be cautious of unexpected callers claiming to be from your alarm company or utility.
Offices can follow a consistent visitor management routine so that the same checks happen every time.
Revoking access for former users
This is where many systems quietly fail. People leave jobs, relationships end, tenants move, contractors finish and babysitters change. If their codes, cards or keys remain active, the system still treats them as trusted.
Good practice includes:
- Keep a written list of who holds which code, credential and key.
- Remove or disable a person’s access on the day they stop needing it, not weeks later.
- When a shared code or a key was ever used by many people, change it.
- Review user lists and logs at least occasionally, and after any change of occupants or staff.
- Check app and camera accounts too, since remote access is also a form of entry. Moves and new occupant changes are a common time to miss this.
For a business, a defined key holder list and an offboarding checklist make removal routine rather than a scramble.
Remote and account verification
Verification applies to online accounts as well as doors. Anyone who gains access to the app can often disarm the system or view cameras. Use a strong unique password, keep software updated, enable two-factor authentication where offered, and be cautious about sharing logins within a household or team; give each person their own account when possible.
Balancing security and convenience
Stronger checks can slow people down. A system that is a nuisance tends to get bypassed, with doors propped open and codes shared. Choose methods that suit the people using them, such as simple codes for children paired with other safeguards, and make sure everyone understands the procedure.
Where to start
List every person and device that can currently get in or arm the system. Remove anything no longer needed, give everyone their own credential where possible, and set a recurring reminder to review the list. Verification is less about technology than about keeping an accurate answer to who is trusted today.