HP 2230s - Compaq Business Notebook - Overview of Design; Supported Keyboard Layouts in Preboot and Drive Encryption

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3. Overview of Design
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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.
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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.
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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.
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4. Supported Keyboard Layouts in Preboot and Drive
Encryption
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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.
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