AtmelCryptoAthenticationTM

ATSHA204ATMEL代理商深圳，提供各方面的技術支持.QQ：1085487223郵箱：V1.0什么是加密芯片它本身具有十分安全的保密性，內部可以存儲秘密數據，內置加密算法，通過安全的認證協(xié)議進行認證過程。認證協(xié)議的作用 認證雙方在不直接出示密鑰的情況下，能夠證明自己知道密鑰。散列函數HashAlan和Bell都是密碼學教授,有一天，他們共同解決一個數學難題。在辦公室里他們都沒有想出來，卻恰好在家里同時想出了答案。AlanBell你算出來是多少？不，你先說。我怎么又知道呢你算過呢？你先說。如果我說了，我怎么知道是你算出來的。散列函數Hash我運算過后是86206恩，我已經知道你是知道的。你不必說出答案了。把函數結果告訴我吧。散列函數HashSHA家族的五個算法，分別是SHA-1、SHA-224、SHA-256、SHA-384，和SHA-512，由美國國家安全局(NSA)所設計，并由美國國家標準與技術研究院(NIST)發(fā)布；是美國的政府標準。后四者有時并稱為SHA-2。散列函數Hashsha256算法散列函數HashHash算法與加密算法

Hash算法是不可逆的，也就是不能通過輸出文本轉化回原文本。不同文本經過Hash算法后可能輸出相同的結果。而加密算法是可逆的，每個加密算法都會有相應的解密算法。原文與密文一一對應。HMAC挑戰(zhàn)響應HMACHMAC是密鑰相關的哈希運算消息認證碼（Hash-basedMessageAuthenticationCode）,HMAC運算利用哈希算法，以一個密鑰和一個消息為輸入，生成一個消息摘要作為輸出。挑戰(zhàn)\響應

客戶端發(fā)送一個消息作為挑戰(zhàn)給服務器，服務器使用事先存儲好的密鑰求MAC，發(fā)回客戶端，這是響應?？蛻舳烁鶕憫獊碚J證。HMAC挑戰(zhàn)響應挑戰(zhàn)\響應ATSHA204AT88SC0104ATSHA204AlgorithmAtmelAlgorithmPublicSHA256Keylength64bit256bitInterfaceI2CSingleWire&I2CMemory1KB4KBNDArequirementYesNoAT88SC0104vsATSHA204ATSHA204SecurityFeaturesRobustCryptoAlgorithmSHA256MAC,HMACAdvancedMulti-LevelHWSecurityActiveshieldoverentirechipAllmemoriesinternallyencryptedInternalstateconsistencycheckingSecurityprotocolshardcodedSupplytamperprotectionInternalclockgenerationSecuretestmethods,noJTAGNodebugprobepoints,notestpadsDesignedtoDefendAgainst:‘Dumpster-diving’attacksMicroprobeattacksTimingattacksProtocolattacksFaultattacksPowercyclingJustasSecureasSmartCards!CompetitorsATMELATSHA204256bitslong.ATSHA204利用這些key作為HASH消息源的一部分。用于MAC,CheckMac,HMAC,GenDig指令。EEPROM的datazone的任意Slot可以存儲Key。(1)Diversifiedkeys根據產品序列碼生成key(2)RolledKeys:防止每次認證都使用相同的key(3)CreatedKeys:根據已知的key產生新的key(4)Single-useKeys使用有次數限制(5)PasswordChecking密碼檢查(6)TransportKeys:傳輸key

KeyAccessoryAuthentication–HostChipDeviceChallengeResponseAccessoryATSHA204SecureKeyStorageSHA-256HashEngineRandomNumberGeneratorSecureKeyStorageSHA-256HashEngineDoTheyMatch?FIPSRNGAVRorARMMicroprocessorStopContinueATSHA204FirmwareAuthenticationCustomerBoardAVRorARMMicroprocessorATSHA204RandomNumberGeneratorKeyStorageSecureKeyStorageSHA-256HashCalculationSHA-256HashEngineDoTheyMatch?NoYesChallengeResponseDate/TimeSecretStorageCustomerBoardAVRorARMMicroprocessorATSHA204KeyStorageSecureKeyStorageSHA-256HashCalculationSHA-256HashEngineWriteReadRandomNumberGeneratorClearDatatoWriteClearDatatoReadClearDataClearDataCrytoDataCrytoDataMutualAuthentication

UniformityacrossentireproductlinesToolsauthenticatebatteriesbeforeallowinguseChargerAuthenticatesbatteriesbeforechargingBatteriesauthenticatechargerbeforechargingOnlyvalidproductscanbeusedtogetherManagingSubcontractorsChipLimitsSubcontractorActionsPreventunauthorizedoverbuildsOEMgivessubcontractorlimitedqtyofsecuritydevicesWarrantyTrackingSubcontractorlogsmfrdate,conditions,etcPersonalizechipforuseatonesubcontractoronlyMatchcorrectpartwithequipment/informationatthatsubconControlmodelnumbersbuiltbyparticularsubconSubcononlyhasauthenticationinformationforcertainmodelsSecureProgrammingFeature

ProtectssecretsatthirdpartysubcontractorsAtmelcansecurelyprogrampartsforhighvolumecustomersCustomer:“Wehavemoreproductssoldunderournamethatarenotproducedbyusthanwhatweproduce”CryptoAuthenticationKitsandSupportMultipleDemo/Eval/KitBoardsModularforcompatibilitywithSTK/EVKboardsSourceCodeLibraryCodeSpeedcustomerdevelopmentcycleExtensiveDocumentationQuickStartandHardwareUserGuidesApplicationNotesDemonstration/EvaluationPCSoftwareAtmelCryptoEvaluationStudio(ACES)AVRStudio5IntegrationSourceCodeLibraryOnline,noNDASupportsmostAVRandARMdevicesI2CorSingleWireIntfcSIO,UARTorSWGPIOIntegratedintoASFframework

KitsIntegratedWithAtmelDev.ToolsSTK600SAM7AT88CK101PluggableAdapterstoSTK/EKboardsSocketstosimplifylabprototypingAvailableformultiplepackagetypesSingleorDualchipforHost/ClientdevelopmentSourceCodeLibraryOnlineFullyintegratedintoASFframework

XplainedTopBoardMultipleCryptoAuthenticationChipsE