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What is a Wild card ssl certificate?

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What is a wild card ssl certificate and what is used for?
asked Jan 27, 2013 in SSL Certificates by anonymous
    

2 Answers

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A Wildcard SSL certificate secures your website URL, and an unlimited number of its subdomains. A single Wildcard certificate can secure domain.com, www.domain.com, mail.domain.com, and any other subdomain.domain.com.

 

Wildcard certificates secure all of the subdomains at the level you specify when you submit your request. Just add an asterisk (*) in the subdomain area of the common name where you want to specify the wildcard. For example:

 

If you configure *.domain.com, you can secure
www.domain.com
secure.domain.com
blog.domain.com, etc.

 

If you configure *.www.domain.com, you can secure
mail.www.domain.com
secure.www.domain.com
blog.www.domain.com, etc.

 

Wildcard certificates secure websites the same as a regular SSL certificate, and requests are processed using the same validation methods. However, some Web servers might require a unique IP address for each subdomain on the Wildcard certificate.

 

NOTE: A Wildcard certificate secures only the level of subdomain you specify. So, if a certificate is configured for *.www.domain.com, it will not secure www.domain.com.

 

answered Jan 27, 2013 by administrator (2,860 points)
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A wildcard certificate is a public key certificate which can be used with multiple subdomains of a domain.

Depending on the number of subdomains an advantage could be that it saves money and also could be more convenient.

Limitation:

  • Only a single level of subdomain matching is supported.
  • It is not possible to get a wildcard for an Extended Validation Certificate.
  • A workaround could be to add every virtual host name in the Subject Alternative Name (SAN) extension. The major problem being that the certificate needs to be reissued whenever a new virtual server is added.
  • Wildcards can be added as domains in multi-domain certificates or Unified Communications Certificates (UCC). In addition, wildcards themselves can have subjectAltName extensions, including other wildcards.

Source: http://en.wikipedia.org/wiki/Wildcard_certificate

answered Mar 14, 2013 by jimarmstrong (430 points)

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