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Digital Signature Certificate

An Introduction:

digitalcertificateDigital certificates are the digital equivalent (i.e. electronic format) of physical or paper certificates. Examples of physical certificates are passports, driver's licenses or membership cards. Certificates serve as identity of an individual for a certain purpose, e.g. a driver's license identifies someone who can legally drive in a particular country. Likewise, a digital certificate can be presented electronically to prove your identity or your right to access information or services on the Internet. Thus, it is just as a handwritten signature is affixed to a printed letter for verification that the letter originated from its purported sender, digital signature performs the same task for an electronic message. A digital signature is an encrypted version of a message digest, attached together with a message.

What are the functions of a digital certificate?

Typically certificates are used to generate confidence in the legitimacy of a public key. In addition to verifying a signature, verifying the signer's certificate increase the confidence of the receiver in ensuring that attempted forgery or impersonation has not occurred.

Digital certificates can be used as to verify someone's (or some company's) identity. It can be used in a variety of ways including to control access on web sites, to create virtual private networks, to secure e-mail, and to guarantee the authenticity of downloaded software.

Examples: