Two-Factor Authentication (2FA)

Source: TH

Context: The rising vulnerability of passwords has led to the adoption of Two-Factor Authentication (2FA) worldwide. Popular apps like Google Authenticator now use TOTP-based codes that refresh every 30 seconds to enhance digital security.

About Two-Factor Authentication (2FA):

• What it is? A security mechanism that requires users to verify identity using two different factors — something they know (password) and something they have (phone/authenticator app).

• A security mechanism that requires users to verify identity using two different factors — something they know (password) and something they have (phone/authenticator app).

• Developed by: Concept of multi-factor authentication emerged in the 1980s in computer science security research. TOTP standard (Time-based One-Time Password) was developed by IETF (Internet Engineering Task Force) in 2011 for global interoperability.

• Concept of multi-factor authentication emerged in the 1980s in computer science security research.

• TOTP standard (Time-based One-Time Password) was developed by IETF (Internet Engineering Task Force) in 2011 for global interoperability.

• Objective: To strengthen authentication, prevent account breaches, and ensure data security by adding a second verification layer beyond traditional passwords.

• How it works:

• Step 1: User enters password (first factor). Step 2: An authenticator app or hardware token generates a time-based OTP (second factor). The server and app share a secret key, using cryptographic HMAC functions with time counters to generate identical codes. If both match, access is granted.

• Step 1: User enters password (first factor).

• Step 2: An authenticator app or hardware token generates a time-based OTP (second factor).

• The server and app share a secret key, using cryptographic HMAC functions with time counters to generate identical codes.

• If both match, access is granted.

• Features:

• Uses TOTP (Time-based One-Time Passwords) valid for ~30 seconds. Employs hash functions & HMAC-SHA256 for strong encryption. Works offline via authenticator apps (Google Authenticator, Authy, Microsoft Authenticator). Can also be implemented via hardware tokens (YubiKey), SMS, or push notifications. Layered approach makes brute force or code interception nearly impossible.

• Uses TOTP (Time-based One-Time Passwords) valid for ~30 seconds.

• Employs hash functions & HMAC-SHA256 for strong encryption.

• Works offline via authenticator apps (Google Authenticator, Authy, Microsoft Authenticator).

• Can also be implemented via hardware tokens (YubiKey), SMS, or push notifications.

• Layered approach makes brute force or code interception nearly impossible.

• Significance:

• Shields accounts from password theft, phishing, and brute-force attacks. Widely used in banking, government portals, healthcare, and corporate IT systems. Promotes digital trust, crucial for Digital India, Aadhaar-based services, and cyber governance.

• Shields accounts from password theft, phishing, and brute-force attacks.

• Widely used in banking, government portals, healthcare, and corporate IT systems.

• Promotes digital trust, crucial for Digital India, Aadhaar-based services, and cyber governance.