About Digital Signatures

V LibreOffice m├┤┼żete elektronicky podpisova┼ą svoje dokumenty a makr├í.

Certifikáty

Aby ste mohli elektronicky podpisova┼ą dokumenty, potrebujete svoj osobn├Ż k─ż├║─Ź, certifik├ít. Osobn├Ż k─ż├║─Ź je ulo┼żen├Ż vo va┼íom po─Ź├şta─Źi ako kombin├ícia s├║kromn├ęho k─ż├║─Źa, ktor├Ż mus├şte dr┼ża┼ą v tajnosti, a verejn├ęho k─ż├║─Źa, ktor├Ż pri podpisovan├ş pripoj├şte k dokumentom.

Ulo┼żi┼ą a podp├şsa┼ą dokument

Ke─Ć potvrd├şte dokument elektronick├Żm podpisom, vypo─Ź├şta sa kontroln├Ż s├║─Źet z obsahu dokumentu a v├í┼ího osobn├ęho k─ż├║─Źa. Tento kontroln├Ż s├║─Źet a v├í┼í verejn├Ż k─ż├║─Ź sa ulo┼żia s dokumentom.

Otvorenie podp├şsan├ęho dokumentu

Ke─Ć niekto nesk├┤r otvor├ş dokument v novej verzii LibreOffice, vypo─Ź├şta sa kontroln├Ż s├║─Źet a porovn├í sa s ulo┼żen├Żm kontroln├Żm s├║─Źtom. Pokia─ż sa oba zhoduj├║, aplik├ícia ozna─Ź├ş, ┼że sa jedn├í o p├┤vodn├Ż, nezmenen├Ż dokument. Naviac si m├┤┼żete zobrazi┼ą inform├ície o verejnom k─ż├║─Źi a certifik├íte.

Verejn├Ż k─ż├║─Ź m├┤┼żete porovna┼ą s verejn├Żm k─ż├║─Źom, ktor├Ż je zverejnen├Ż na webe certifika─Źnej autority.

Ktoko─żvek dokument zmen├ş, znehodnot├ş sa t├Żm elektronick├Ż podpis. Po ├║prave u┼ż aplik├ícia neozna─Ź├ş dokument ako p├┤vodn├Ż.

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.

You can see any of the following icons and messages when you open a signed document.

Icon in Status bar

Signature status

Ikonka

The signature is valid.

Ikonka

The signature is OK, but the certificates could not be validated.

The signature and the certificate are OK, but not all parts of the document are signed. (For documents that were signed with old versions of the software, see note below.)

Ikonka

The signature is invalid.


Signatures and software versions

The signing of contents got changed with OpenOffice.org 3.2 and StarOffice 9.2. Now all contents of the files, except the signature file itself (META-INF/documentsignatures.xml) are signed.

When you sign a document with OpenOffice.org 3.2 or StarOffice 9.2 or a later version, and you open that document in an older version of the software, the signature will be displayed as "invalid". Signatures created with older versions of the software will be marked with "only parts of the document are signed" when loaded in the newer software.

When you sign an OOXML document, then the signature will be always marked with "only parts of the document are signed". Metadata of OOXML files are never signed, to be compatible with Microsoft Office.

When you sign a PDF document, then this marking is not used. Signing only parts of the document is simply an invalid signature.

Signing other document formats is not supported at the moment.

note

When you load an ODF document, you might see an icon in the status bar and the status field in the dialog that indicates that the document is only partially signed. This status will appear when the signature and certificate are valid, but they were created with a version of OpenOffice.org before 3.2 or StarOffice before 9.2. In versions of OpenOffice.org before 3.0 or StarOffice before 9.0, the document signature was applied to the main contents, pictures and embedded objects only and some contents, like macros, were not signed. In OpenOffice.org 3.0 and StarOffice 9.0 the document signature was applied to most content, including macros. However, the mimetype and the content of the META-INF folder were not signed. And in OpenOffice.org 3.2, StarOffice 9.2, and all versions of LibreOffice all contents, except the signature file itself (META-INF/documentsignatures.xml), are signed.


Bezpe─Źnostn├ę varovanie

Ke─Ć obdr┼ż├şte podp├şsan├Ż dokument a program ozn├ími, ┼że je podpis platn├Ż, nemus├ş to znamena┼ą absol├║tnu istotu, ┼że ide o ten ist├Ż dokument, ktor├Ż poslal odosielate─ż. Podpisovanie dokumentov digit├ílnymi certifik├ítmi nie je stopercentne bezpe─Źn├í met├│da. Existuj├║ sp├┤soby, ako toto zabezpe─Źenie ob├şs┼ą.

Example: Think about someone who wants to camouflage his identity to be a sender from your bank. He can easily get a certificate using a false name, then send you any signed email pretending he is working for your bank. You will get that email, and the email or the document within has the "valid signed" icon.

Nedôverujte len ikone. Preskúmajte a otvorte certifikát.

warning

Overenie podpisu nepredstavuje ┼żiadnu z├íkonn├║ istotu.


V opera─Źn├Żch syst├ęmoch Windows sa na overenie podpisu pou┼ż├şvaj├║ funkcie Windows. V opera─Źn├Żch syst├ęmoch Solaris a Linux sa pou┼ż├şvaj├║ kni┼żnice Thunderbirdu, Mozilly ─Źi Firefoxu. Uistite sa, ┼że pou┼ż├şvate kni┼żnice p├┤vodne dodan├ę v├Żvoj├írmi. ├Üto─Źn├şk by mohol tieto kni┼żnice nahradi┼ą in├Żmi.

warning

Ozn├ímenie o overen├ş podpisu v LibreOffice zobrazuje v├Żsledok overenia z├şskan├Ż zo syst├ęmu. LibreOffice nijako nezaru─Źuje, ┼że t├íto spr├íva zodpoved├í skuto─Źn├ęmu stavu certifik├ítu. LibreOffice iba zobrazuje spr├ívy kni┼żn├şc, ktor├ę nem├┤┼że ovplyvni┼ą. Neexistuje ┼żiadny pr├ívny z├ív├Ązok, ┼że LibreOffice zobraz├ş skuto─Źn├Ż stav elektronick├ęho podpisu.


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