Skype - 3.0 beta Betriebsanweisung PDF herunterladen (Seite 31)

Skype Network Administrator’s Guide Skype 3.0 Beta 31

2006-10-31 Document version 2.0 Beta

To verify installer authenticity for Microsoft Windows, follow these steps:

1. Locate the Skype installer program. Open the Windows File Explorer and

navigating to the Skype installer program if necessary.

2. Right-click the Skype installer program. Then select Properties from the pop-up

context menu. The Properties dialog box for the Skype installer is displayed.

3. One of the tabs at the top of the Properties dialog box should be labeled “Digital

Signatures”. If you do not see this tab, STOP. Then skip to the next section,

“Problems with a Digital Signature”. If you do see the Digital Signatures tab,

continue to step 4.

4. In the Properties dialog box, a list of digital signatures that apply to this installer

is displayed. You should see only one signer of the installer package: Skype

Technologies SA. Double-click the line that contains Skype Technologies SA. This

displays a window that contains the details of Skype’s digital signature.

5. Verify that the pop-up window labeled Digital Signature Information indicates

that this digital signature is OK. If the pop-up window indicates that the digital

signature is not valid, stop, because there is a problem, and skip to the “Problems

with a Digital Signature” section that follows. Otherwise, continue to step 6.

6. Next, click the View Certificate button to display the details of the digital

certificate that was used to sign the installer software. The pop-up window labeled

Certificate should show you this:

Issued to: Skype Technologies SA

Issued by: VeriSign Class 3 Code Signing 2001 CA

If the text in either of the fields in the pop-up window is different from what is

shown above (except for the year of the signing because it changes every 12

months) STOP, because there is a problem with the installer’s digital signature.

Then skip to the “Problems with a Digital Signature” section that follows. However,

if it is OK, continue to step 7.

7. Click the Details tab to display the serial number of the signing certificate. Verify

the certificate serial number with the appropriate serial number, available from the

Skype Security Web site at www.skype.com/security.

If the certificate serial number for your copy of the Skype installer does not exactly

match the one you get from the Skype Web site, STOP, because there is a problem

with the installer’s digital signature. If this happens, skip to the “Problems with a

Digital Signature”.

9. If you encountered no problems with the digital signature verification process,

you can safely install the Skype client.

Problems with a Digital Signature

There are any number of reasons an invalid digital signature can appear on downloaded

files.

One possibility is that the installer may have been corrupted accidentally while it was

being downloaded. Another potential reason is that Skype may have been bundled

improperly with a third-party software without appropriate permission. Or, someone may

have tampered with a copy of the software to incorporate spyware, adware, or malware,

violating the terms of the Skype End User License Agreement.

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