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A Practical Guide to TPM 2.0





History of the TPMWhy a TPM?History of Development of the TPM Specification from 1.1b to 1.2How TPM 2.0 Developed from TPM 1.2History of TPM 2.0 Specification DevelopmentSummaryBasic Security ConceptsCryptographic AttacksBrute ForceCalculating the Strength of Algorithms by TypeAttacks on the Algorithm ItselfSecurity DefinitionsCryptographic FamiliesSecure Hash (or Digest)Hash ExtendHMAC: Message Authentication CodeKDF: Key Derivation FunctionAuthentication or Authorization TicketSymmetric-Encryption KeySymmetric-Key ModesNonceAsymmetric KeysRSA Asymmetric-Key AlgorithmRSA for Key EncryptionRSA for Digital SignaturesECC Asymmetric-Key AlgorithmECDH Asymmetric-Key Algorithm to Use Elliptic Curves to Pass KeysECDSA Asymmetric-Key Algorithm to Use Elliptic Curves for SignaturesPublic Key CertificationSummaryQuick Tutorial on TPM 2.0Scenarios for Using TPM 1.2IdentificationEncryptionKey StorageRandom Number GeneratorNVRAM StoragePlatform Configuration RegistersPrivacy EnablementScenarios for Using Additional TPM 2.0 CapabilitiesAlgorithm Agility (New in 2.0)Enhanced Authorization (New in 2.0)Quick Key Loading (new in 2.0)Non-Brittle PCRs (New in 2.0)Flexible Management (New in 2.0)Identifying Resources by Name (New in 2.0)SummaryExisting Applications That Use TPMsApplication Interfaces Used to Talk to TPMsTPM Administration and WMIThe Platform Crypto ProviderVirtual Smart CardApplications That Use TPMsApplications That Should Use the TPM but Don'tBuilding Applications for TPM 1.2TSS.Net and TSS.C++Wave Systems Embassy SuiteRocks to Avoid When Developing TPM ApplicationsMicrosoft BitLockerIBM File and Folder EncryptionNew Manageability Solutions in TPM 2.0SummaryNavigating the SpecificationTPM 2.0 Library Specification: The PartsSome DefinitionsGeneral DefinitionsDefinitions of the Major Fields of the Command Byte StreamDefinitions of the Major Fields of the Response Byte StreamGetting Started in Part 3: the CommandsData DetailsCommon Structure ConstructsTPM2B_XXX StructuresStructure with UnionCanonicalizationEndianness: Notation Syntax: Table DecorationsCommonly Used Sections of the SpecificationHow to Find Information in the SpecificationStrategies for Ramping Up on TPM 2.0WillKenDaveOther TPM 2.0 SpecificationsSummaryExecution EnvironmentSetting Up the TPMMicrosoft SimulatorBuilding the Simulator from Source CodeSetting Up a Binary Version of the SimulatorRunning the SimulatorTesting the SimulatorPython ScriptTSS.netSystem API Test CodeSetting Up the Software StackTSS 2.0TSS.netSummaryTPM Software StackThe Stack: a High-Level ViewFeature APISystem APICommand Context Allocation FunctionsCommand Preparation FunctionsCommand Execution FunctionsSimple Code ExampleSystem API Test CodeTCTITPM Access Broker (TAB)Resource ManagerDevice DriverSummaryTPM EntitiesPermanent EntitiesPersistent HierarchiesEphemeral HierarchyDictionary Attack Lockout ResetPlatform Configuration Registers (PCRs)Reserved HandlesPassword Authorization SessionPlatform NV EnableNonvolatile IndexesObjectsNonpersistent EntitiesPersistent EntitiesEntity NamesSummaryHierarchiesThree Persistent HierarchiesPlatform HierarchyStorage HierarchyEndorsement HierarchyPrivacyActivating a CredentialOther Privacy ConsiderationsNULL HierarchyCryptographic PrimitivesRandom Number GeneratorDigest PrimitivesHMAC PrimitivesSymmetric Key PrimitivesSummaryKeysKey CommandsKey GeneratorPrimary Keys and SeedsPersistence of KeysKey CacheKey AuthorizationKey DestructionKey HierarchyKey Types and AttributesSymmetric and Asymmetric Keys AttributesDuplication AttributesRestricted Signing KeyRestricted Decryption KeyContext Management vs. LoadingNULL HierarchyCertificationKeys UnraveledSummaryNV IndexesNV Ordinary IndexNV Counter IndexNV WrittenNV Index Handle ValuesNV NamesNV PasswordSeparate CommandsSummaryPlatform Configuration RegistersPCR ValueNumber of PCRsPCR CommandsPCRs for AuthorizationPCRs for AttestationPCR Quote in DetailPCR AttributesPCR Authorization and PolicyPCR AlgorithmsSummaryAuthorizations and SessionsSession-Related DefinitionsPassword, HMAC, and Policy Sessions: What Are They?Session and Authorization: Compared and ContrastedAuthorization RolesCommand and Response Authorization Area DetailsCommand Authorization AreaCommand Authorization StructuresResponse Authorization StructuresPassword Authorization: The Simplest AuthorizationPassword Authorization LifecycleCreating a Password Authorized EntityChanging a Password Authorization for an Already Created EntityUsing a Password AuthorizationCode Example: Password SessionStarting HMAC and Policy SessionsTPM2_StartAuthSession CommandSession Key and HMAC Key DetailsGuidelines for TPM2_StartAuthSession Handles and ParametersSession VariationsSalted vs. UnsaltedBound vs. UnboundUse Cases for Session VariationsHMAC and Policy Sessions: DifferencesHMAC AuthorizationHMAC Authorization LifecycleAltering or Creating an Entity That Requires HMAC AuthorizationCreating an HMAC SessionUsing an HMAC Session to Authorize a Single CommandHMAC and Policy Session Code ExampleUsing an HMAC Session to Send Multiple Commands (Rolling Nonces)HMAC Session SecurityPolicy AuthorizationHow Does EA Work?Policy Authorization Time IntervalsPolicy Authorization LifecycleBuilding the Entity's Policy DigestCreating the Entity to Use the Policy DigestStarting the Real Policy SessionSending Policy Commands to Fulfill the PolicyPerforming the Action That Requires AuthorizationCombined Authorization LifecycleSummaryExtended Authorization (EA) PoliciesPolicies and PasswordsWhy Extended Authorization?Multiple Varieties of AuthenticationMultifactor AuthenticationHow Extended Authorization WorksCreating PoliciesSimple Assertion PoliciesPasswords (Plaintext and HMAC) of the ObjectPasswords of a Different ObjectDigital Signatures (such as Smart Cards)PCRs: State of the MachineLocality of CommandInternal State of the TPM (Boot Counter and Timers)Internal Value of an NV RAM LocationState of the External Device (GPS, Fingerprint Reader, and So On)Flexible (Wild Card) PolicyCommand-Based AssertionsMultifactor AuthenticationExample 1: Smart card and PasswordExample 2: A Policy for a Key Used Only for Signing with a PasswordExample 3: A PC state, a Password, and a FingerprintExample 4: A Policy Good for One Boot CycleExample 5: A Policy for Flexible PCRsExample 6: A Policy for Group AdmissionExample 7: A Policy for NV RAM between 1 and 100Compound Policies: Using Logical OR in a PolicyMaking a Compound PolicyExample: A Policy for Work or Home ComputersConsiderations in Creating PoliciesEnd User RoleAdministrator RoleUnderstudy RoleOffice RoleHome RoleUsing a Policy to Authorize a CommandStarting the PolicySatisfying a PolicySimple Assertions and Multifactor AssertionsIf the Policy Is CompoundIf the Policy Is Flexible (Uses a Wild Card)Satisfying the Approved PolicyTransforming the Approved Policy in the Flexible PolicyCertified PoliciesSummaryKey ManagementKey GenerationKey Trees: Keeping Keys in a Tree with the Same Algorithm SetDuplicationKey DistributionKey ActivationKey DestructionPutting It All TogetherExample 1: Simple Key ManagementExample 2: An Enterprise IT Organization with Windows TPM 2.0 Enabled SystemsSummaryAuditing TPM CommandsWhy AuditAudit CommandsAudit TypesCommand AuditSession AuditAudit LogAudit DataExclusive AuditSummaryDecrypt/Encrypt SessionsWhat Do Encrypt/Decrypt Sessions Do?Practical Use CasesDecrypt/Encrypt LimitationsDecrypt/Encrypt SetupPseudocode FlowSample CodeSummaryContext ManagementTAB and the Resource Manager: A High-Level DescriptionTABResource ManagerResource Manager OperationsManagement of Objects, Sessions, and SequencesTPM Context-Management FeaturesTPM Internal SlotsSpecial Error CodesTPM Context-Management CommandsSpecial Rules Related to Power and Shutdown EventsState DiagramsSummaryStartup, Shutdown, and ProvisioningStartup and ShutdownStartup InitializationProvisioningTPM Manufacturer ProvisioningPlatform OEM ProvisioningEnd User ProvisioningDeprovisioningSummaryDebuggingLow-Level Application DebuggingThe ProblemAnalyze the Error CodeDebug Trace AnalysisMore Complex ErrorsLast ResortCommon BugsDebugging High-level ApplicationsDebug ProcessTypical BugsAuthorizationDisabled FunctionMissing ObjectsWrong TypeBad SizePolicySummarySolving Bigger Problems with the TPM 2.0Remote Provisioning of PCs with IDevIDs Using the EKTechnique 1Technique 2Technique 3Data BackupsSeparation of PrivilegeSecuring a Server's LogonLocking Firmware in an Embedded System, but Allowing for UpgradesSummaryPlatform Security Technologies That Use TPM 2.0The Three TechnologiesSome TermsIntel® Trusted Execution Technology (Intel® TXT)High-Level DescriptionIntel TXT Platform ComponentsIntel TXT Boot SequenceHow TPM 2.0 Devices Are UsedNV IndicesPCRsConclusion: Intel TXTARM® TrustZone®High-Level DescriptionTrustZone Is an Architectural FeatureProtection TargetSystem-Wide SecurityImplementation of TrustZoneThe NS bitThe MonitorWorld SwitchingInterruptsRelationship to TPMsAMD Secure Technology™Hardware Validated BootTPM on an AMD PlatformSKINITSummary
 
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