Lenovo ThinkVantage (Client Security Solution 8.21) Bedienungsanleitung Seite 83

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Glossary
Administrator(ThinkCentre)/Supervisor(ThinkPad)
BIOSPassword
Theadministratororsupervisorpasswordisused
tocontroltheabilitytochangeBIOSsettings.This
includesthecapabilitytoenableordisablethe
embeddedsecuritychipandtocleartheStorage
RootKeystoredwithintheTrustedPlatformModule.
AdvancedEncryptionStandard(AES)AdvancedEncryptionStandardisasymmetric
keyencryptiontechnique.TheU.S.Government
adoptedthealgorithmasitsencryptiontechnique
inOctober2000,replacingtheDESencryptionit
used.AESoffershighersecurityagainstbrute-force
attackthanthe56-bitDESkeys,andAEScanuse
128,192and256-bitkeys,ifnecessary.
CryptographysystemsCryptographysystemscanbebroadlyclassied
intosymmetric-keyencryptionthatuseasingle
keythatbothencryptsanddecryptsthedata,and
Public-keyencryptionthatusetwokeys,apublic
keyknowntoeveryoneandaprivatekeythatonly
theownerofthekeypairhasaccessto.
EmbeddedSecurityChip
Theembeddedsecuritychipisanothernamefora
TrustedPlatformModule.
Public-key/Asymmetric-keyencryption
Public-keyalgorithmstypicallyuseapairoftwo
relatedkeysonekeyisprivateandmustbekept
secret,whiletheotherismadepublicandcan
bewidelydistributed;itshouldnotbepossible
todeduceonekeyofapairgiventheother.The
terminologyof"public-keycryptography"derives
fromtheideaofmakingpartofthekeypublic
information.Thetermasymmetric-keycryptography
isalsousedbecausenotallpartiesholdthesame
information.Inasense,onekey"locks"alock
(encrypts);butadifferentkeyisrequiredtounlock
it(decrypt).
StorageRootKey(SRK)Thestoragerootkey(SRK)isa2,048-bit(orlarger)
publickeypair.Itisinitiallyemptyandiscreated
whentheTPMownerisassigned.Thiskeypair
neverleavestheembeddedsecuritychip.Itisused
toencrypt(wrap)privatekeysforstorageoutside
theTrustedPlatformModuleandtodecryptthem
whentheyareloadedbackintotheTrustedPlatform
Module.TheSRKcanbeclearedbyanyonethat
hasaccesstotheBIOS.
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