This document introduces a new identity security system called Sierra Border Security V1.0. It discusses how the assumptions around internet and enterprise security have changed over time as the perimeter has expanded with new technologies. The key challenges mentioned are that identity is now too weak and disconnected to protect organizations at scale. The proposed new system aims to evolve authentication beyond single-factor to continuous multi-factor authentication using standards-based interactions. It will leverage big data and intelligence for dynamic access control and move to identity-based security definitions.