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Overview of Design

The goal of the HP ProtectTools implementation is to use password filters to

reject passwords that might lock out a user at the Preboot BIOS level or Drive

Encryption level. The ProtectTools Security Manager will be responsible to

reject a user password at setup or password change time. A password can be

acceptable for the Windows password, but if allowed may cause a lock out at

Preboot BIOS or Drive Encryption level. These passwords will therefore be

rejected by the HP ProtectTools password filter.

The BIOS Preboot and Drive Encryption each preloads tables of key mapping

from Scan Code to Unicode based on the supported keyboard layout. (see table

Figure ‐1 below). When the user enters the password before OS starts, the BIOS

or the Drive Encryption software will convert the key strokes to the correct

Unicode based on key mapping tables and then compare the password with the

one stored. The ProtectTools Security Manager will pass the keyboard layout

information to BIOS Preboot and Drive Encryption.

In addition, the BIOS Preboot and Drive Encryption may implement additional

methods to assist password entering. E.g. In 2008 Business Notebook BIOS, a

soft keyboard will be loaded to enter glyphs directly with the mouse instead of

pressing a key on the keyboards if a user fails to type their password correctly.

The Drive Encryption software allows the user to dynamically load the

keyboard layouts.

Supported Keyboard Layouts in Preboot and Drive

Encryption

The Preboot BIOS and Drive Encryption support a subset of Windows' keyboard

layouts due to space and other limitations. Below is a list (Figure 1) of

supported keyboards in Preboot and Drive Encryption. In some cases, the

common name for a particular keyboard layout differs in Windows Vista from

the HP designation. In order to clarify, we provide both names.