Coordinated Universal Time (UTC) is the time standard by which the world regulates clocks and time. It is within about 1 second of mean solar time at 0° longitude and is not adjusted for daylight saving time.
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A certificate authority (CA) is an entity that is trusted to sign, issue, distribute and revoke digital certificates. A digital certificate certifies the ownership of a public key by the named subject of the certificate. Certificates from CAs can be used for SSL /TLS security for Perspective.