Two-Factor Authentication
Two-factor authentication (2FA) is a security method requiring users to provide two different types of identification to access a system.
technology
Category
beginner
Difficulty
4 min read
Read time
2025-01-15
Updated
Definition
Short definition
Two-factor authentication (2FA) is a security method requiring users to provide two different types of identification to access a system.
Detailed explanation
Two-factor authentication (2FA), also called multi-factor authentication (MFA), adds an extra layer of security beyond username and password. Users must provide something they know (password) plus something they have (phone, security key) or something they are (biometric).
For HR systems containing sensitive employee data, 2FA is essential security. Even if passwords are compromised, attackers cannot access accounts without the second factor.
Common 2FA methods include SMS codes, authenticator apps (like Google Authenticator or Microsoft Authenticator), hardware security keys, and biometrics. Authenticator apps and security keys are more secure than SMS.
Practical guidance
How it works
After entering username and password, users are prompted for a second factor. This could be a code from an app, SMS message, push notification, or biometric verification. Only after providing both factors is access granted.
Best practices
Mandate 2FA for all users
Prefer authenticator apps over SMS
Provide backup authentication methods
Train users on 2FA importance and use
Legal context
Legal basis
GDPR (appropriate security measures), Cyber Essentials
Jurisdiction: Global
Key provisions
GDPR requires appropriate technical security
Cyber Essentials mandates MFA for cloud services
Financial regulations often require strong authentication
Industry standards recommend MFA for sensitive data
Official source
Frequently asked questions
Is SMS-based 2FA still secure?
SMS is better than no 2FA, but it's the weakest option due to SIM swapping attacks and SMS interception. Authenticator apps or hardware keys are significantly more secure and are recommended for sensitive systems.
What if an employee loses their 2FA device?
Good 2FA implementations provide backup options: backup codes, alternative phone numbers, admin reset capabilities. Users should store backup codes securely when setting up 2FA.
Should 2FA be mandatory for all HR system users?
Yes. HR systems contain sensitive personal data, making them valuable targets. Mandatory 2FA for all users (not just admins) significantly reduces breach risk and is increasingly required by regulations and standards.
Related glossary terms
Single Sign-On
Single sign-on (SSO) is an authentication method that allows users to access multiple applications with one set of login credentials.
Data Protection
Data protection is the practice of safeguarding employee personal information from unauthorised access, use, disclosure, or loss.
HRIS
An HRIS (Human Resource Information System) is software that manages and automates HR processes including employee data, payroll, benefits, and reporting.
Audit Trail
An audit trail is a chronological record of all changes, transactions, and activities in an HR system, showing who did what and when.