For a more detailed description of how to get and manage a certificate, and signature validation, see “Using Digital Signatures" in the OOo Help. On Solaris and Linux systems, files that are supplied by Thunderbird, Mozilla or Firefox are used. On Windows operating systems, the Windows features of validating a signature are used. Whenever someone changes something in the document, this change breaks the digital signature. You can compare the public key with the public key that is published on the web site of the certificate authority. In addition, the program can show you the public key information from the certificate. If both are the same, the program will signal that you see the original, unchanged document. When someone later opens the document on any computer with a recent version of, the program will compute the checksum again and compare it with the stored checksum. The checksum and your public key are stored together with the document. When you apply a digital signature to a document, a kind of checksum is computed from the document's content plus your personal key. You can get a certificate from a certification authority, which may be a private company or a governmental institution. A personal key is stored on your computer as a combination of a private key, which must be kept secret, and a public key, which you add to your documents when you sign them. To sign a document digitally, you need a personal key, the certificate.
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