![]() ![]() 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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