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A time-based one-time password (TOTP) is a code that changes every few seconds based on the current time. It is used for two-factor authentication (2FA) and is part of the OATH standard.
A one-time password (OTP) is a password that is valid for only one login session or transaction, on a computer system or other digital device. OTPs avoid several shortcomings that are associated with traditional (static) password-based authentication and can be generated using different algorithms and methods.
The following is a general comparison of OTP applications that are used to generate one-time passwords for two-factor authentication (2FA) systems using the time-based one-time password (TOTP) or the HMAC-based one-time password (HOTP) algorithms.
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Learn about HOTP, a one-time password algorithm based on HMAC, used for authentication and open standard. Find out how it works, its parameters, tokens, and reception.
Google Authenticator is a software app that generates one-time passwords for multi-factor authentication. It uses a shared secret key provided by the service provider and a time-based or counter-based algorithm to calculate the password.
Mutual authentication is a security step that can prevent many adversarial attacks, such as man-in-the-middle, replay, spoofing, and impersonation. Learn how mutual authentication works, what credentials are used, and how it is applied in IoT and mTLS.
S/KEY is a scheme that generates single-use passwords from a secret key and a counter, to authenticate users to Unix-like operating systems. It is based on cryptographic hash functions and requires a secure channel to prevent man-in-the-middle attacks.