Defining Certificate Authority in VS .NET

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Defining Certificate Authority
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A CA is a trusted organization that issues certificates for both servers and clients (that is, users) To understand the need for such an organization, consider the following scenario A client wants to securely access a Web application on your extranet Web server The client uses HTTPS protocol to access your extranet server, for example, https://extranetdomaincom/loginservlet The client s Web browser initiates the SSL connection request Your extranet Web server uses its private key to encrypt data it sends to the client s Web browser, which decrypts the data using your Web server s public key Because the Web server also sends the public key to the Web browser there is no way to determine whether the public key is authentic In other words, there is nothing to stop a malicious computer hacker from intercepting the information from your extranet server and sending the hacker s public key to your client That s where the CA comes into play A CA would issue you a certificate after verifying information regarding your company in the offline world This server certificate is signed by the CA s own public key, which is well known In such a case, when the Web browser receives the server certificate, it can decrypt the certificate information using the well-known CA s public key This ensures that the server certificate is authentic The Web browser can then verify that the domain name used in the authentic certificate is the same one it is communicating with Similarly, if you needed to ensure that the client is really who the client says it is, you could enforce a client-side certificate restriction, which enables you to turn the entire transaction into a closed-loop secured process The idea is that if each party has a certificate that validates the other s identity, that confirms the public key, and that is signed by a trusted agency, then they both will be assured that they are communicating with whom they think they are communicating There are two types of Certificate Authority: commercial CA and self-certified private CA
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Commercial CA
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A commercial CA s primary job is to verify other commercial or nonprofit companies that want to establish their authenticity in the Internet After a CA verifies the offline authenticity of a company by checking various legal records such as official company registration documents or certificate of incorporation, official letters from top management of the company, and so on, the CA can sign the certificate There are only a few commercial CAs Verisign (wwwverisigncom) and Thawte (www thawtecom) are the best-known CAs Verisign has acquired Thawte Consulting
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Self-certified, private CA
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A private CA is very much like the root-level commercial CA It is self-certified However, a private CA is typically used in a LAN or WAN environment, or inexperimenting with SSL For example, a US university with a WAN that interconnects departments might decide to use a private CA instead of a commercial one As long as you are not expecting an unknown user to trust your private CA, you can use it In the following section, I show you how to create a private CA for your organization Thereafter, I show you how to get a certificate from a commercial CA or to create your own CA to certify your servers and clients
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