Locks & Keys: Security

Fingerprint scanning identifies people by their fingertip ridges, patterns considered essentially unique to each person.

The pin tumbler lock, patented by Linus Yale Jr., remains the most widely used lock mechanism today.

Combination locks secure with a numeric sequence, removing the risk of a lost or copied key.

A deadbolt resists forced entry far better than a standard spring latch, since it can't be simply pushed open.

Padlocks are portable and detachable, ranking among the oldest and most widely used lock designs in history.

Safes protect valuables from theft and fire, often rated by how long they resist fire or forced entry.

Biometric security verifies identity using unique traits like fingerprints, faces, and iris patterns.

Facial recognition analyzes facial feature patterns and is increasingly used to unlock smartphones.

Two-factor authentication combines different factor categories. Two passwords are still only one factor category: something you know.

Passwords verify identity through secret character strings, best kept long and unique per account.

CCTV transmits surveillance footage to limited monitors and is widely used to deter and investigate crime.

Alarm systems detect unauthorized entry, triggering sirens, lights, or automatic alerts to responders.

Locksmithing, the trade of making and repairing locks, ranks among the oldest specialized trades still practiced.

A master key opens multiple different locks and is widely used across hotels and large office buildings.

Vaults are reinforced secure rooms commonly used by banks to store cash and important documents.

Security cameras capture continuous footage of monitored areas, with modern versions often internet-connected.

Access control systems manage entry permissions, often using key cards, codes, or biometric scans.

Motion detectors sense movement in a monitored area and form a core part of most home alarm systems.

Smart locks can be controlled and monitored remotely, often through a smartphone app.

Keyless entry systems grant access without a physical key, first widely adopted in the automotive industry.

Cryptography secures information by transforming it into unreadable code, a practice stretching back thousands of years.

Antivirus software detects and removes malware, regularly updated to recognize newly discovered threats.

Digital signatures verify a message's authenticity, confirming it has not been altered since signing.

A skeleton key is filed to open several simple locks, exploiting the simplicity of older lock designs.

Bulletproof glass resists gunfire by bonding multiple layers of glass and plastic together.

The panic bar allows quick keyless emergency exit, developed after a tragic theater fire with blocked doors.

Tamper-evident seals reveal visible evidence of opening, widely used on food and medicine packaging.