If the description of the methodology to sign a driver provided in the documentation of WDK seems complex, it is actually very simple to sign a driver.

Here is the method:

1. Install the WDK,
2. Install the certificate,
3. In one directory, place the binary of driver to be signed and file the certificate downloaded from : http://www.microsoft.com/whdc/winlogo/drvsign/crosscert.mspx,
4. Start a DDK compilation console for a chosen compilation environment (eg "Windows Vista and Windows Server Longhorn x86 Free Build Environment"),
5. Go in the directory containing the binary to be signed,
6. Start: signtool sign / a / ac <selected cross certificate> / v / t <url of timestamp> <selected driver>
7. Which gives, for example, for a GlobalSign certificate:
   signtool sign / a / ac MSCV-GlobalSign.cer / v / t
   http://timestamp.globalsign.com/scr... PhSerUsb.sys.

Attention: only the call command line signtool allows to attach the cross-certificate properly.