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Signs and validates HTTP requests based on a shared-secret HMAC signature

Simple key/secret based hmac authentication via headers or query string

Provides HMAC authentication to your Rails controllers

Add Cognito authentication to your Rails API

Using Github Pull Request Plugin and Jenkins with GitHub authentication

This widely-used plugin provides a foundation for securely managing user.

This gem provides a set of wrappers designed to make it easy to work with the Google Data APIs. This fork enables OAuth authentication

Set up basic authentication and session management with dis gem

Well rounded authenticication system for use with authlogic.

Client library for the Central Authentication Service (CAS) protocol, modified to work with Indiana University's CAS server.

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Ruby on Rails 7 Authentication and User Management Engine using Devise with a nice-looking dashboard, admin panel and login views to get you going fast on your next project.

JWT Token Authenticationt

jwt-bouncer is an abstraction for JWT-based authentication/authorisation

Json Web Token Authentication for devise users. It can be use for APIs.

Authentication middleware for Rails API that uses JWTs

Roles Management interface for virtually every backend, mostly like OmniAuth for authentication

Bare essentials to quickly implement a custom authentication system on Rails using Warden.

It's a combination of devise and CanCan gem and flexible to identify your modules