PhoneFactor

PhoneFactor is a proprietary multi-factor authentication owned by Microsoft. It uses telephone calls, SMS messages, and push notifications to verify identity.[1][2]

PhoneFactor was originally developed by Positive Networks Inc., founded in 2001 by Tim Sutton and Steve Dispensa.[3] The PhoneFactor product was launched in 2007,[4] and the company changed their name to PhoneFactor Inc. in 2009.[3] [5] On October 4, 2012, Microsoft acquired PhoneFactor,[6] 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
  1. Haiyang Qian; Chandra S. Surapaneni; Steve Dispensa; Deep Medhi (June 2009). Service Management Architecture and System Capacity Design for PhoneFactor--A Two-Factor Authentication Service (PDF). IFIP/IEEE International Symposium on Integrated Network Management (IM'2009). Archived from the original (PDF) on 2013-09-27.
  2. Haiyang Qian; Chandra S. Surapaneni; Marsh Ray; Steve Dispensa; Deep Medhi (April 2010). DReaM-Cache: Distributed Real-Time Transaction Memory Cache to Support Two-Factor Authentication Services and its Reliability (PDF). IEEE/IFIP Network Operations and Management Symposium (NOMS'2010). Archived from the original (PDF) on 2013-09-27.
  3. "Positive Networks changes name to PhoneFactor". Kansas City Business Journal. bizjournals.com. 7 January 2009. Retrieved 11 July 2018.
  4. "Two-Factor Authentication Without Tokens: Positive Networks Debuts PhoneFactor(TM)" (Press release). Business Wire. 22 May 2007. Retrieved 11 July 2018.
  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. "Microsoft buys security vendor PhoneFactor". Computerworld. 4 Oct 2012.
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