Generating authentication challenges based on preferences of a user's contacts

摘要

Generating user authentication challenges based in part on preferences of one or more contacts of a user includes receiving an authentication request from a user. One or more contacts of the user associated with the authentication request are determined. One or more preferences of the close contact or contacts are determined. An authentication challenge based on the one or more preferences of one or more of the user's contacts is generated. The authentication request is allowed or denied based on the completion on the authentication challenge.