Most Popular Certificate Authorities

This section provides a list of most popular certificate authorities in 2009. The top is 'Go Daddy', which has about 21.17% of the market share.

Based on a research report from, top 30 certificate authorities in 2009 are:

 Share   Group                Certificate Authority
21.17%   Go Daddy   , Inc.
12.79%   VeriSign             Equifax Secure Inc.
11.19%   VeriSign             Thawte Consulting cc
10.58%   Comodo               UTN-USERFirst-Hardware
 8.23%   VeriSign             VeriSign, Inc.
 7.80%   VeriSign             Equifax
 6.38%   VeriSign             VeriSign Trust Network
 3.37%   Comodo               Comodo CA Limited
 2.55%   Network  Solutions   Network Solutions L.L.C.
 2.25%   Go Daddy             Starfield Technologies, Inc.
 1.57%                        DigiCert Inc
 1.24%   GlobalSign           GlobalSign nv-sa
 0.67%                        Cybertrust
 0.63%   AmbironTrustWave     SecureTrust Corporation
 0.60%   VeriSign             Thawte Consulting (Pty) Ltd.
 0.56%                        Root CA
 0.55%                        IPS Certification Authority s.l.
 0.47%   Comodo               Secure Business Services, Inc.
 0.42%   VeriSign             RSA Data Security, Inc.
 0.34%                        Betrusted Japan Co., Ltd.
 0.33%                        StartCom Ltd.
 0.30%                        SECOM
 0.27%   GlobalSign           Alpha
 0.25%   GlobalSign           GlobalSign
 0.24%                        TC TrustCenter for Security in Data ...
 0.23%                        CAcert Inc.
 0.20%   Comodo               Comodo Limited
 0.19%                        T-Systems Enterprise Services GmbH
 0.19%                        U.S. Government
 3.11%                        (Others)

Last update: 2011.

Table of Contents

 About This Book

Introduction of PKI (Public Key Infrastructure)

 What Is PKI (Public Key Infrastructure)?

 Usage Examples of Public Key Infrastructure

Most Popular Certificate Authorities

 Introduction of HTTPS (Hypertext Transfer Protocol Secure)

 Using HTTPS with IE (Internet Explorer) 10

 Using HTTPS with Chrome 40

 Using HTTPS with Firefox 35

 Perl Scripts Communicating with HTTPS Servers

 PHP Scripts Communicating with HTTPS Servers

 Java Programs Communicating with HTTPS Servers

 Certificate Stores and Certificate Console

 .NET Programs Communicating with HTTPS Servers - Root CA Offering Free Certificates

 PKI CA Administration - Issuing Certificates

 Digital Signature - Microsoft Word 2007

 Digital Signature - 3

 S/MIME and Email Security

 PKI (Public Key Infrastructure) Terminology

 Outdated Tutorials


 PDF Printing Version