OpenOffice.org OpenOffice - 3.3 Základní průvodce stáhnout pdf (Strana 158)

must be kept secret, and a public key, which you add to your documents when you

sign them. You can get a certificate from a certification authority, which may be a

private company or a governmental institution.

When you apply a digital signature to a document, a checksum is computed from the

document’s content plus your personal key. The checksum and your public key are

stored together with the document.

When someone later opens the document on any computer with a recent version of

OpenOffice.org, the program will compute the checksum again and compare it with

the stored checksum. If both are the same, the program will signal that you see the

original, unchanged document. In addition, the program can show you the public key

information from the certificate. You can compare this key with the public key that is

published on the web site of the certificate authority.

Whenever someone changes something in the document, this change breaks the

digital signature.

On Windows operating systems, the Windows features of validating a signature are

used. On Solaris and Linux systems, files that are supplied by Thunderbird, Mozilla or

Firefox are used. For a more detailed description of how to get and manage a

certificate, and signature validation, see “Using Digital Signatures” in the OOo Help.

To sign a document:

1) Choose File > Digital Signatures.

2) If you have not saved the document since the last change, a message box

appears. Click Yes to save the file.

3) After saving, you see the Digital Signatures dialog. Click Add to add a public

key to the document.

4) In the Select Certificate dialog, select your certificate and click OK.

5) 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

to view the certificate.

Removing personal data

You may wish to ensure that personal data, versions, notes, hidden information, or

recorded changes are removed from files before you send them to other people or

create PDFs from them.

In Tools > Options > OpenOffice.org > Security > Options, you can set Calc to

remind (warn) you when files contain certain information and remove personal

information automatically on saving.

To remove personal and some other data from a file, go to File > Properties. On the

General tab, uncheck Apply user data and then click the Reset button. This

removes any names in the created and modified fields, deletes the modification and

printing dates, and resets the editing time to zero, the creation date to the current

date and time, and the version number to 1.

To remove version information, either go to File > Versions, select the versions from

the list and click Delete, or use Save As and save the file with a different name.

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