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

pac4j  is a Java security engine to authenticate users, get their profiles and manage their authorizations in order to secure Java web applications. It supports most authentication mechanisms: OAuth (Facebook, Twitter, Google, Yahoo...), CAS, HTTP (form, basic auth...), OpenID, SAML, Google App Engine, OpenID Connect, JWT, LDAP, RDBMS, MongoDB and Stormpath and authorization checks.


pac4j - The security engine to protect all your Java web applications

Apache Shiro is a powerful and easy-to-use Java security framework that performs authentication, authorization, cryptography, and session management. With Shiro’s easy-to-understand API, you can quickly and easily secure any JVM-based application – from the smallest mobile applications to the largest web and enterprise applications.

Apache Shiro - Java Security Framework

A Java library that keeps OAuth 2.0 service access tokens in memory for your usage.
    

tokens - Java library for conveniently verifying and storing OAuth 2.0 service access tokens

OAuth2 provider microservices based on Light-Java and SQL

light-oauth2 - A fast, light and cloud native OAuth 2

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Google Authenticator - Two factor authentication

pac4j - The security engine to protect all your Java web applications

Apache Shiro - Java Security Framework

tokens - Java library for conveniently verifying and storing OAuth 2.0 service access tokens

light-oauth2 - A fast, light and cloud native OAuth 2

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Projects

Google Authenticator - Two factor authentication

pac4j - The security engine to protect all your Java web applications

Apache Shiro - Java Security Framework

tokens - Java library for conveniently verifying and storing OAuth 2.0 service access tokens

light-oauth2 - A fast, light and cloud native OAuth 2

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