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Online services have difficulties to replace passwords with more secure userauthentication mechanisms, such as Two-Factor Authentication (2FA). This ispartly due to the fact that users tend to reject such mechanisms in use casesoutside of online banking. Relying on password authentication alone, however,is not an option in light of recent attack patterns such as credentialstuffing.  Risk-Based Authentication (RBA) can serve as an interim solution to increasepassword-based account security until better methods are in place.Unfortunately, RBA is currently used by only a few major online services, eventhough it is recommended by various standards and has been shown to beeffective in scientific studies. This paper contributes to the hypothesis thatthe low adoption of RBA in practice can be due to the complexity ofimplementing it. We provide an RBA implementation for the open source cloudmanagement software OpenStack, which is the first fully functional open sourceRBA implementation based on the Freeman et al. algorithm, along with initialreference tests that can serve as a guiding example and blueprint fordevelopers.

Risk-Based Authentication for OpenStack: A Fully Functional Implementation and Guiding Example