Duo Security enables protected login and transactional functions for smartphones users. It does this by sending users authorization verification from web-based platform to their phones, in addition to their login. Their REST API provides integration to their two-factor authentication process. It is a RESTful API, and returns JSON (defaut), BSON, and XML responses.
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The Duo Ruby SDK by Duo interacts with the API to access security features. Installing, using, and testing components are available as resources. Use the SDK to create Ruby applications that aim to increase the safety of a service.