Symmetric-keyencryptionSymmetrickeyencryptionciphersusethesamekey
forencryptionanddecryptionofdata.Symmetric
keyciphersaresimplerandfaster,buttheirmain
drawbackisthatthetwopartiesmustsomehow
exchangethekeyinasecureway.Public-key
encryptionavoidsthisproblembecausethe
publickeycanbedistributedinanon-secure
way,andtheprivatekeyisnevertransmitted.
AdvancedEncryptionStandardisanexampleofa
symmetric-key.
TrustedPlatformModule(TPM)
TrustedPlatformModulesarespecial-purpose
integratedcircuitsbuiltintosystemstoenable
stronguserauthenticationandmachineverication.
ThemainpurposeoftheTPMistoprevent
inappropriateaccesstocondentialandsensitive
information.TheTPMisahardwarebasedrootof
trustthatcanbeleveragedtoprovideavarietyof
cryptographicservicesonasystem.Anothername
forTPMistheembeddedsecuritychip.
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