US Patent 9118656 Systems and methods for multi-factor authentication

Requests to gain access to secure resources are adjudicated according to authentication policies that include rules based on user-states derived from multiple heterogeneous access-control systems. Comprehensive user authentication and access control based on rules and policies that encompass a user's status in multiple access-control systems, including both logical access (e.g., Active Directory, RADIUS, Virtual Private Network, etc.) as well as physical access (e.g., card-based) control systems, may be realized.