Authentication
The process of confirming a user's identity by verifying their credentials (password, OTP, biometric, etc.).
What is Authentication?
Authentication is the process of verifying that a user is who they claim to be. It answers the question: "Who are you?"
Authentication typically involves one or more of the following factors:
- Something you know: Password, PIN, security question
- Something you have: Phone (SMS/TOTP), hardware token (YubiKey), smart card
- Something you are: Biometric (fingerprint, face scan, iris scan)
Common authentication methods include:
- Password-based: Username + password (weakest, single factor)
- Multi-Factor Authentication (MFA): Password + OTP/biometric (recommended)
- Passwordless: FIDO2/WebAuthn (YubiKey, FaceID) - strongest
- Social Login: Using Google/Facebook accounts (convenient)
Authentication is the first step in the security chain - after authentication comes authorization (what you're allowed to do).
Analogy
Think of authentication like a bouncer checking your ID at a club. They verify that you are who you claim to be by checking your photo ID against your face. Once verified, they let you in. Authentication proves 'you are who you say you are'.
Types and Use Cases
- Consumer Apps: Authenticate users via password + MFA or passwordless (FIDO2)
- Enterprise SSO: Authenticate employees via SAML/OIDC with corporate IdP
- APIs: Authenticate service-to-service calls via API keys or client credentials
- Physical Access: Authenticate employees with badge swipe or biometric scan
How it Works
// Authentication Flow (Simplified)
// Step 1: User provides credentials
POST /api/auth/login
{
"username": "user@example.com",
"password": "user_password",
"otp": "123456" // if MFA enabled
}
// Step 2: Server validates credentials
if (validatePassword(username, password) && validateOTP(username, otp)) {
// Step 3: Create session or issue tokens
const accessToken = generateAccessToken(username);
const refreshToken = generateRefreshToken(username);
return {
accessToken: accessToken,
refreshToken: refreshToken,
tokenType: "Bearer",
expiresIn: 3600
};
}Authentication vs Authorization
Authentication
Authorization
Authentication verifies who you are (identity)
Authorization verifies what you can do (permissions)
Authentication happens before authorization - you must prove who you are before the system decides what you can access
Authentication uses credentials (password, OTP)
Authorization uses policies/rules (RBAC, ABAC)
Best Practices for Authentication
- Enforce MFA: Passwords alone are insufficient - require at least one additional factor (TOTP, hardware key, biometric)
- Use passwordless where possible: FIDO2/WebAuthn (YubiKey, FaceID) is stronger than passwords + MFA
- Implement account lockout: Temporarily lock accounts after failed attempts to prevent brute-force attacks
How LoginRadius Powers Authentication
LoginRadius CIAM platform provides flexible authentication methods including password-based, multi-factor (SMS, TOTP, FIDO2, push), passwordless (magic links, WebAuthn), social login (40+ providers), and federated (SAML, OIDC). Our platform handles the complete authentication flow with configurable MFA policies, adaptive authentication (risk-based), breach detection, and step-up authentication for sensitive actions. LoginRadius also provides detailed authentication analytics, audit logs, and compliance reporting (SOC 2, ISO 27001).
FAQs
Authentication answers 'Who are you?' - it verifies your identity using credentials (password, OTP, biometric). Authorization answers 'What are you allowed to do?' - it checks your permissions (admin vs. user, read vs. write). Authentication comes first (prove who you are), then authorization (determine what you can access). Think of authentication as showing your ID to enter a building, authorization as your key card only working on certain floors.
Yes, passwordless authentication (FIDO2/WebAuthn, magic links, SMS OTP) is typically more secure than passwords because: (1) No password to be phished or breached, (2) FIDO2 is phishing-resistant (domain-bound), (3) No password reuse across sites. However, SMS OTP has vulnerabilities (SIM swapping) - prefer FIDO2 (YubiKey, FaceID) or magic links for strongest security.
LoginRadius provides comprehensive authentication options: (1) Password-based with breached password detection and strength validation, (2) Multi-Factor Authentication (SMS OTP, TOTP, FIDO2, push notification), (3) Passwordless (magic links, WebAuthn/FIDO2), (4) Social Login (Google, Facebook, Apple, 40+ providers), (5) Federated (SAML, OIDC with corporate IdP). Our platform handles the complete authentication flow with configurable policies, adaptive authentication, and detailed audit logs.