2FA, or Two-Factor Authentication, is a security process used to verify the identity of a user or device by requiring two different authentication factors. Authentication factors are pieces of information or characteristics that help confirm that the person or device trying to access a system or account is legitimate.
Here’s how 2FA works:
- First Factor (Knowledge): This is usually something the user knows, such as a password, PIN, or security question. It’s the traditional method of authentication.
- Second Factor (Possession or Inherence): This is something the user has or something the user is. It provides an additional layer of security. Second factors can include:
- Smartphone or TokenThe user receives a one-time code on their smartphone through an app or via SMS.
- Hardware TokenA physical device that generates time-based or event-based codes.
- Biometric DataCharacteristics unique to the user, like fingerprints or facial recognition.
To gain access, a user needs to provide both the first and second factors. Even if someone knows the user’s password (first factor), they won’t be able to access the account without the second factor (e.g., the one-time code sent to their smartphone).
2FA significantly enhances security because it makes it much harder for unauthorized individuals to access accounts or systems, even if they have stolen or cracked a password. It is widely used in online banking, email services, social media accounts, and many other applications to protect sensitive information from unauthorized access and cyberattacks.
Key terms in plain language
Open a term for a concise explanation of language used on this page.
Cybersecurity
The practices and controls used to protect identities, devices, networks, applications, and data from unauthorized access, disruption, or manipulation.
Zero Trust
A security model that does not automatically trust a user or device because of its location. Access is continuously verified and limited to what is necessary.
SASE
Secure Access Service Edge combines networking and security capabilities in a cloud-delivered architecture so users and locations can receive consistent policy wherever they connect.
Identity and Access Management (IAM)
The systems and policies that determine who a user is, what resources they may access, and how that access is authenticated and reviewed.
Multi-Factor Authentication (MFA)
A login control requiring more than one form of verification, such as a password plus an authenticator app, security key, or biometric factor.
MDR / XDR
Security services and tools that monitor activity, investigate suspicious behavior, and help contain threats. MDR is managed detection and response; XDR correlates signals across multiple security layers.