Tillämpa digitala signaturer
Skaffa ett certifikat
Du kan få ett certifikat från en certifikatutfärdare. Oavsett om du väljer en statlig institution eller ett privat företag är det vanligt att debiteras för denna tjänst, exempelvis när de ska intyga din identitet. Några myndigheter utfärdar gratis certifikat, till exempel Open Source projektet CAcert som är baserad på den välkända och pålitliga Web of Trust modellen, vars popularitet ökar.
Hantera certifikaten
If you are using Linux, macOS or Solaris, you must install a recent version of Thunderbird or Firefox. LibreOffice will then access their certificate storage.
If you have created different profiles in Thunderbird or Firefox and you want to use certificates from one specific user profile, select the profile in Tools - Options - Security - Certificate Path. Alternatively, you can set the environment variable MOZILLA_CERTIFICATE_FOLDER to point to the folder containing that profile.
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Open your web browser’s preferences, select the Advanced section, click on the Certificates tab, and then choose View Certificates. The Certificate Manager dialog will appear.
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Importera det nya rotcertifikatet. Sedan kan du markera och redigera certifikatet. Ange att rotcertifikatet ska gälla för åtminstone webbåtkomst och e-post. Då kan certifikatet användas för att signera dokument. Du kan redigera mellanliggande certifikat på samma sätt, men det är inte obligatoriskt för signering av dokument.
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När du har redigerat de nya certifikaten ska du starta om LibreOffice.
On Windows systems, LibreOffice will access the system certificate storage.
Your private key for the digital signature will usually be generated and securely stored by Windows as part of the signature-issuance process. Once the issuing Certificate Authority is satisfied that your computer produced the private key and you have satisfied any other identification requirements, the corresponding public key is signed by the Certificate Authority. For personal keys obtained over the Internet, the private key is generated by your browser and it is not shared with the Certificate Authority.
If a private key is received by other means or you transfer it from another computer, you can install it on your Windows PC by double-clicking on the private key certificate and providing any required password. This private key may be known to others (such as an organizational or governmental security administration) depending on how it was issued to you.
Public keys of other people used to verify document digital signatures, or encrypt documents for their eyes only, are usually stored in your system with digital certificate-management applications. In some cases you will need to manage those public-key certificates yourself.
The general management of public and private keys on your PC will vary depending on the version of Windows you are operating. For more information, use the "Help and Support" topic of your Windows version and search for "digital signature".
Signera ett dokument
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Choose File - Digital Signatures - Digital Signatures.
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En meddelanderuta visas om att du bör spara dokumentet. Spara filen genom att klicka på Ja.
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När du har sparat visas dialogrutan Digitala signaturer. Klicka på Lägg till om du vill lägga till en allmän nyckel i dokumentet.
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In the Select Certificate dialog, select your certificate and click OK.
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You see again the Digital Signatures dialog, where you can add more certificates if you want. Click OK to add the public key to the saved file.
A signed document shows an icon 
in the status bar. You can double-click the icon in the status bar to view the certificate.
The result of the signature validation is displayed in the status bar and within the Digital Signature dialog. Several documents and macro signatures can exist inside an ODF document. If there is a problem with one signature, then the validation result of that one signature is assumed for all signatures. That is, if there are ten valid signatures and one invalid signature, then the status bar and the status field in the dialog will flag the signature as invalid.
Signera makron i ett dokument
Makron utgör vanligtvis en del av ett dokument. Om du signerar ett dokument, signeras makrona i det automatiskt. Om du bara vill signera makrona, men inte dokumentet, gör du så här:
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Välj Verktyg - Makron - Digital signatur.
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Tillämpa signaturen på det sätt som beskrivs för dokument ovan.
When you open the Basic IDE that contains signed macros, you see an icon in the status bar. You can double-click the icon in the status bar to view the certificate.