One-Time Password
A one-time password (OTP) is a temporary, single-use authentication code used to verify user identity in digital systems. It is typically generated by an algorithm and sent via SMS, email, or generated by an authenticator app, providing an additional layer of security beyond static passwords. OTPs are widely used in two-factor authentication (2FA) and multi-factor authentication (MFA) to prevent unauthorized access.
Developers should learn about OTPs when implementing secure authentication systems, especially for applications handling sensitive data like banking, healthcare, or e-commerce. It is crucial for compliance with security standards (e.g., PCI-DSS, GDPR) and to protect against common attacks like phishing or credential stuffing. Use cases include user login flows, transaction confirmations, and password resets.