During the same keynote, Scott Charney also shared details about Microsoft's U-Prove technology, which it acquired from Credentica back in 2008:
U-Prove is an innovative cryptographic technology that enables the issuance and presentation of cryptographically protected claims in a manner that provides multi-party security: issuing organizations, users, and relying parties can protect themselves not just against outsider attacks but also against attacks originating from each other. At the same time, the U-Prove technology enables any desired degree of privacy (including authenticated anonymity and pseudonymity) without contravening multi-party security. These user-centric aspects make the U-Prove technology ideally suited to create the digital equivalent of paper-based credentials and the plastic cards in one's wallet.
Further details and related downloads can be found here.