Java Glossary : X.509 v3

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X.509 v3: A standard for formatting digital certificates that Netscape uses for digitally signing jar files. The standard allows for additional information to be included in the form of keyword=value pairs. When the certificate authority signs the certificate with their private key, they are attesting that all the information in the certificate is correct. You can check if a certificate is valid without checking at an online database since you know the public keys of all the certificate issuing authorities; they are burned into your browser. However, if you want to ensure the certificate has not been revoked, you need to check with the database at the certificate authority's website. PGP does not use this format. It uses its own simpler one.
certificates ¤ digital signatures ¤ PGP

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