Two-Factor Auth Integration with Duo Security By Chris Cornutt @ 2013-01-09

Using the Duo Security API you can manage multiple users and integrations, all through a REST interface

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Twofactor Authentication Duosecurity Api Webservice

Easy Two-Factor Authentication with Authy By Chris Cornutt @ 2013-01-07

Using the Authy REST API, you can quickly and easily integrate two-factor auth into your system.

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Twofactor Authentication Authy Api Webservice