PhoneFactor

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title: "PhoneFactor" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["identity-documents"] topic_path: "general/identity-documents" source: "https://en.wikipedia.org/wiki/PhoneFactor" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

PhoneFactor is a proprietary multi-factor authentication owned by Microsoft. It uses telephone calls, SMS messages, and push notifications to verify identity.

PhoneFactor was originally developed by Positive Networks Inc., founded in 2001 by Tim Sutton and Steve Dispensa. and the company changed their name to PhoneFactor Inc. in 2009. On October 4, 2012, Microsoft acquired PhoneFactor, and the PhoneFactor service is now available as Azure Multi-Factor Authentication. In addition to securing on-premises applications and identities, the service now also works with cloud applications like Microsoft 365 that use Windows Microsoft Azure Active Directory.

References

References

  1. (June 2009). "Service Management Architecture and System Capacity Design for PhoneFactor--A Two-Factor Authentication Service".
  2. (April 2010). "DReaM-Cache: Distributed Real-Time Transaction Memory Cache to Support Two-Factor Authentication Services and its Reliability".
  3. (22 May 2007). "Two-Factor Authentication Without Tokens: Positive Networks Debuts PhoneFactor(TM)".
  4. (7 January 2009). "Positive Networks changes name to PhoneFactor". bizjournals.com.
  5. Quain, John R.. (8 Oct 2008). "Logging on Securely, and Confirmed via a Cellphone Call as a Sentinel Against Intruders". New York Times / NYT.com.
  6. (4 Oct 2012). "Microsoft buys security vendor PhoneFactor". Computerworld.

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