OTP

One-Time Password

A password that is valid for only one login session or transaction, after which it becomes invalid. OTPs are widely used as a secure authentication method, especially in scenarios requiring an additional layer of security beyond the standard username and password. Key points about OTPs:

1. Single-use: An OTP is used only once and becomes invalid after its first use, making it more secure than static passwords.
2. Generation: OTPs can be generated using various algorithms, such as HOTP (HMAC-based One-Time Password) or TOTP (Time-based One-Time Password).
3. Delivery methods: OTPs can be delivered to users through various channels, such as SMS, email, mobile apps, or hardware tokens.
4. Two-factor authentication (2FA): OTPs are often used as the second factor in 2FA systems, where users must provide both their regular password and a valid OTP to access a service.
5. Protects against password-related threats: Since OTPs are single-use and time-sensitive, they help protect against threats such as password reuse, phishing, and keylogging.

There are several types of OTPs:

1. Time-based OTPs (TOTP): Generated based on the current time and a shared secret key.
2. HMAC-based OTPs (HOTP): Generated based on a counter value and a shared secret key.
3. SMS OTPs: Sent to the user’s mobile phone via SMS.
4. Email OTPs: Sent to the user’s email address.
5. Hardware token OTPs are generated by a dedicated hardware device, such as a key fob or a smart card.

OTPs are widely used in various applications, including online banking, e-commerce, and corporate network access, to enhance security and protect user accounts from unauthorized access.

• Abbreviation: OTP