How to manage a challenge-set library for multi-factor self-sovereign identity authentication?

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Ahmed A. Mawgoud

This requires careful planning and implementation, the library should include:

All the necessary challenges to verify the user's identity. This can include biometric authentication, SMS OTP, or other methods.

An authentication workflow that can be tailored to the specific needs of the application.

Support the ability to add, modify, or delete challenge sets as needed.

To ensure reliability and accuracy of the authentication process, the challenge-set library should be tested regularly and monitored for any changes or suspicious activity.

Furthermore, the library should be designed to be flexible enough to support different types of authentication, such as federated identity, passwordless authentication, or other methods.

The challenge-set library should also include a logging system to track user activity and help detect any suspicious activity or fraud. Finally, the library should also be designed to be compatible with other identity solutions and services, such as OAuth and OpenID Connect.

Alex Norta

Very good points. My vision is more of an app store with a challenge-set marketplace a bit allegorical comparable to an app store. It isn't possible to know the challenges all in advance and there should be a marketplace instead with a token economy governing the incentive mechanisms.

Isaac Obiri

Determine the types of challenges to include in the library: Depending on the desired level of security and the resources available, you might include knowledge-based challenges (e.g., "What is your mother's maiden name?"), possession-based challenges (e.g., "What is the last four digits of your phone number?"), or inherence-based challenges (e.g., biometric authentication). You might also consider using one-time password (OTP) systems, which use a shared secret and a time-based or counter-based algorithm to generate a unique password for each login attempt.

Create the challenge sets: For each type of challenge, you will need to create a set of challenges that can be used to verify a user's identity. These challenges should be selected based on their effectiveness in identifying the user, as well as their difficulty for attackers to guess or otherwise bypass.

Store the challenge sets: The challenge sets should be securely stored in a database or other secure location. To further secure the challenge sets, you might consider encrypting them using a strong, cryptographically secure cipher such as AES or ChaCha20.

Use the challenge sets in MFA processes: When a user attempts to log in or perform some other action that requires MFA, select a set of challenges from the library and present them to the user. They will need to successfully complete these challenges in order to gain access.

Update the challenge sets regularly: It is important to regularly review and update the challenge sets in your library to ensure that they remain effective at verifying user identities. This might involve adding new challenges or retiring old ones that are no longer effective. You should also consider rotating the challenge sets on a regular basis to reduce the risk of attackers being able to guess the challenges through repetition.