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Wildcard certificate
In computer networking, a wildcard certificate is a public key certificate which can be used with multiple subdomains of a domain. The principal use is for securing web sites with HTTPS, but there are also applications in many other fields. Compared with conventional certificates, a wildcard certificate can be cheaper and more convenient than a certificate for each domain.
==Analog==
One analogy is that of a public notary which issues a public validation of a person's identity. An individual wishing to have her identity validated would submit her own name and some evidence of her residence and existence. The public notary would sign a document asserting the identity of the individual for a fee. The notary would risk his professional accreditation in doing so, which would presumably lead to a reasonable assessment of the person's identity as verified. Since the public could place some trust in a practicing lawyer doing such, the certification is an indication of the validity of the person's identity. In the computer realm, an individual website www.wikipedia.org is the person and the certification authority is the notary public.
The analog of a wildcard certificate would be as follows. During the same meeting, the person represents that they have several unidentified children. They also would like the notary public to certify all of those children as existing persons. The notary public at the same time signs a number of blank letters with empty spaces for the names of the children, and in that letter states that the certification is valid if there is DNA matching the person's own. A wildcard certificate would enable the person to represent to the public those children of the same surname and lineage, with the same force as their own identity. In this analog the Internet DNS is the DNA match. Since the person controls their own DNA it is unlikely they could represent a child as their own without a DNA match
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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