Duo Security enables protected login and transactional functions for smartphones users. It does this by sending users authorization verification from web-based platform logins to their phones. Their Verify API provides access to the verification function with a one-time PIN number, as well as lookup methods for specific phone numbers and IP addresses. The API is RESTful and responds with JSON, BSON, and XML.
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Recent investigations show how users can be authenticated via web without using passwords. It’s called WebAuthn or Web Authentication that uses a Web API in a browser. Clients can be verified with their phones, hardware keys, or trusted devices. In his article, Nick Steele explains the new standards