Name some authorities who issue digital certificate. What are the contents of a digital certificate?

Subject E-Commerce
NU Year Set: 2.(d) Marks: 4 Year: 2017

A Digital certificate is issued by a trusted third party to establish the identity of the holder. The third party who issues certificates is known as a Certification Authority (CA). Digital certificate technology is based on public key cryptography.

Contents of a Typical Digital Certificate 

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Serial Number Used to uniquely identify the certificate.

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Subject The person, or entity identified.
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Signature Algorithm The algorithm used to create the signature.
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Issuer The entity that verified the information and issued the certificate.
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Valid-From The date the certificate is first valid from.
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Valid-To The expiration date.
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Public Key The public key to encrypt a message to the named subject.
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Thumbprint Algorithm The algorithm used to hash the certificate.

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Thumbprint The hash itself to ensure that the certificate has not been tampered with.


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