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DigiCert Inc is a privately held, US-based X.509 SSL certificate authority (CA). As a trusted third party, DigiCert verifies the authenticity of secure websites on behalf of a web browser.

DigiCert Inc
Private company
IndustryInternet security, Public key infrastructure
Founded2003; 16 years ago (2003)
Key people
CEO: John Merrill, COO: Flavio Martins, CFO: Michael Olson

The company worked in conjunction with Microsoft to develop and promote the use of subject alternate names in SSL certificates, for use with Microsoft Exchange Server.[1]

It primarily sells Organization Validation (OV) and Extended Validation (EV) SSL certificates.[2]

DigiCert Inc. is of no relation to Digicert Sdn. Bhd, a Malaysian-based certification authority that issues certificates with weak keys and had its trust revoked by web browsers.[3][4][5]


DigiCert was founded by Ken Bretschneider in 2003. He was named as a finalist in the Ernst & Young Entrepreneur of the Year Award in 2012 as a result.[6][7] He served as CEO and Chairman of the Board until he left in 2012 to head up People Water[8] and was replaced by Nicholas Hales.[9] DigiCert is currently majority-owned by private equity firm Thoma Bravo, with TA Associates holding a minority share. Thoma Bravo acquired a majority stake in DigiCert on Aug. 28, 2015 in one of the largest investments in a Utah-based company to date, stating that "DigiCert represents an outstanding investment opportunity to back a market leader . . . known for its consistent innovation and first-rate customer service.[10]

In 2017, DigiCert acquired the TLS/SSL and Public Key Infrastructure businesses of Symantec, including the Certificate Authority brands Thawte, RapidSSL, VeriSign and GeoTrust.[11][12]


  1. ^ [1] Archived January 23, 2009, at the Wayback Machine.
  2. ^ "Domain Validated SSL? Why We Don't Offer It". 2009-02-19. Retrieved 2015-12-25.
  3. ^ "SSL Certificate Support - Entrust, Inc". Retrieved 2015-12-25.
  4. ^ Revoking Trust in DigiCert Sdn. Bhd Intermediate Certificate Authority, Mozilla. "DigiCert Sdn. Bhd is a Malaysian subordinate CA under Entrust and Verizon (GTE CyberTrust). It bears no affiliation whatsoever with the US-based corporation DigiCert, Inc., which is a member of Mozilla’s root program."
  5. ^ Microsoft Security Advisory (2641690) "DigiCert Sdn. Bhd is not affiliated with the corporation DigiCert, Inc., which is a member of the Microsoft Root Certificate Program."
  6. ^ Chandler, Jeff. "Entrepreneur of the Year 2012". Retrieved July 9, 2014.
  7. ^ "Ken Bretschneider's Nomination for Entrepreneur of the Year". July 14, 2012. Archived from the original on May 30, 2014. Retrieved July 9, 2014.
  8. ^ "People Water Names Ken Bretschneider CEO". April 24, 2012. Retrieved July 9, 2014.
  9. ^ "Utah's DigiCert reorganizes its management". Salt Lake Tribune. April 17, 2012. Retrieved July 9, 2012.
  10. ^ Sean Michael Kerner (2015-08-28). "Thoma Bravo Invests in Security Firm DigiCert". Retrieved 2015-12-25.
  11. ^ "DigiCert Completes Acquisition of Symantec's Website Security and Related PKI Solutions". DigiCert. December 31, 2017.
  12. ^ "Symantec offloads its cert and web security biz to DigiCert". The Register. August 3, 2017.

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