The Google Authenticator project includes implementations of one-time passcode generators for several mobile platforms, as well as a pluggable authentication module (PAM). One-time passcodes are generated using open standards developed by the Initiative for Open Authentication (OATH). These implementations support the HMAC-Based One-time Password (HOTP) algorithm specified in RFC 4226 and the Time-based One-time Password (TOTP) algorithm specified in RFC 6238. 

Google Authenticator - Two factor authentication

One Time Passwords (OTPs) are an mechanism to improve security over passwords alone. When a Time-based OTP (TOTP) is stored on a user's phone, and combined with something the user knows (Password), you have an easy on-ramp to Multi-factor authentication without adding a dependency on a SMS provider. This Password and TOTP combination is used by many popular websites including Google, Github, Facebook, Salesforce and many others.
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This library provides support in generating QR Code images for easy user enrollment. It supports both Time-based One-time Password Algorithm (TOTP) (RFC 6238) and HMAC-based One-time Password Algorithm (HOTP).


One Time Passwords (OTPs) are an mechanism to improve security over passwords alone. When a Time-based OTP (TOTP) is stored on a user's phone, and combined with something the user knows (Password), you have an easy on-ramp to Multi-factor authentication without adding a dependency on a SMS provider. This Password and TOTP combination is used by many popular websites including Google, Github, Facebook, Salesforce and many others.



otp - One Time Password utilities Go / Golang

GoogleAuth is a Java server library that implements the Time-based One-time Password (TOTP) algorithm specified in RFC 6238. This library can be used by any developer who wants to add TOTP multi-factor authentication to a Java application and needs the server-side code to create TOTP shared secrets and verify TOTP passwords.Google Authenticator Server side code

GoogleAuth is a Java server library that implements the Time-based One-time Password (TOTP) algorithm specified in RFC 6238. This library can be used by any developer who wants to add TOTP multi-factor authentication to a Java application and needs the server-side code to create TOTP shared secrets and verify TOTP passwords.

GoogleAuth - Google Authenticator Server side code

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Google Authenticator - Two factor authentication

otp - One Time Password utilities Go / Golang

GoogleAuth - Google Authenticator Server side code

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Google Authenticator - Two factor authentication

otp - One Time Password utilities Go / Golang

GoogleAuth - Google Authenticator Server side code

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License