【英文标准名称】:Temporaryworksequipment-Part2:Informationonmaterials;GermanversionEN12811-2:2004
【原文标准名称】:临时工作设备.第2部分:材料的信息
【标准号】:EN12811-2-2004
【标准状态】:现行
【国别】:
【发布日期】:2004-04
【实施或试行日期】:
【发布单位】:欧洲标准学会(EN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:试验性能;尺寸选定;工作场所安全;职业安全;防腐蚀;材料;规范(验收);材料质量;试验;负荷;钢合金;材料选择;钢;钢的等级;木材;尺寸;元部件;建筑;文献工作;材料规范;建筑用木料;强度等级;额定值;铸铁;脚手架;铝合金;木质板材;物料参量;工作脚手架;吊式脚手架;材料数据
【英文主题词】:Aluminiumalloys;Cast-iron;Components;Construction;Corrosionprotection;Dimensioning;Dimensions;Documentations;Loading;Materialparameters;Materialqualities;Materialselection;Materials;Materialsdata;Materialsspecification;Occupationalsafety;Ratings;Scaffolds;Slungscaffolds;Specification(approval);Steelalloy;Steelgrades;Steels;Strengthclass;Structuraltimber;Testperformance;Testing;Wood;Woodbasedsheetmaterials;Workscaffoldings;Workplacesafety
【摘要】:
【中国标准分类号】:P97
【国际标准分类号】:91_220
【页数】:18P.;A4
【正文语种】:英语


【英文标准名称】:Informationtechnology-Securitytechniques-MessageAuthenticationCodes(MACs)-Part1:Mechanismsusingablockcipher
【原文标准名称】:信息技术.安全技术.电文鉴别代码(MACS).第1部分:用块密码的机制
【标准号】:ISO/IEC9797-1-1999
【标准状态】:作废
【国别】:国际
【发布日期】:1999-12
【实施或试行日期】:
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:ISO/IECJTC1
【标准类型】:()
【标准水平】:()
【中文主题词】:远程通信;算法;校验;信息交流;信息技术;正文通信;信息交换;数据处理;安全;网络互连;文电;数据传送;块密码;代码;多路存取计算机;机械;数据传输
【英文主题词】:Algorithms;Authentication;Blockcipher;Codes;Dataprocessing;Datatransfer;Datatransmission;Informationexchange;Informationinterchange;Informationtechnology;MAC;Mechanism;Messages;Networkinterconnection;Safety;Telecommunication;Textcommunication
【摘要】:ThispartofISO/IEC9797specifiessixMACalgorithmsthatuseasecretkeyandann-bitblockciphertocalcu-lateanm-bitMAC.Thesemechanismscanbeusedasdataintegritymechanismstoverifythatdatahasnotbeenalteredinanunauthorisedmanner.Theycanalsobeusedasmessageauthenticationmechanismstopro-videassurancethatamessagehasbeenoriginatedbyanentityinpossessionofthesecretkey.Thestrengthofthedataintegritymechanismandmessageauthenti-cationmechanismisdependentonthelength(inbits)kandsecrecyofthekey,ontheblocklength(inbits)nandstrengthoftheblockcipher,onthelength(inbits)moftheMAC,andonthespecificmechanism.ThefirstthreemechanismsspecifiedinthispartofISO/IEC9797arecommonlyknownasCBC-MAC(CBCistheabbreviationofCipherBlockChaining).ThecalculationofaMACasdescribedinISO8731-1andANSIX9.9isaspecificcaseofthispartofISO/IEC9797whenn=64,m=32,MACAlgorithm1andPaddingMethod1areused,andtheblockcipherisDEA(ANSIX3.92:1981).ThecalculationofaMACasdescribedinANSIX9.19andISO9807isaspecificcaseofthispartofISO/IEC9797whenn=64,m=32,eitherMACAlgorithm1orMACAlgorithm3isused(bothwithPaddingMethod1),andtheblockcipherisDEA(ANSIX3.92:1981).ThefourthmechanismisavariantofCBC-MACwithaspecialinitialtransformation.ItisrecommendedforapplicationswhichrequirethatthekeylengthoftheMACalgorithmistwicethatoftheblockcipher.NOTES1Forexample,inthecaseofDEA(ANSIX3.92:1981),theblockcipherkeylengthis56bits,whiletheMACalgorithmkeylengthis112bits.2WhenusedwithDEA(whichisalsoknownasDES),thisalgorithmiscalledMacDES[12].Thefifthandsixthmechanismusetwoparallelinstancesofthefirstandfourthmechanismrespectively,andcom-binethetworesultswithabitwiseexclusive-oropera-tion.Theyarerecommendedforapplicationswhichre-quireanincreasedsecuritylevelagainstforgeryattacks(cf.AnnexB).ThefifthmechanismusesasinglelengthMACalgorithmkey,whilethesixthmechanismdoublestheMACalgorithmkeylength.ThispartofISO/IEC9797canbeappliedtothese-curityservicesofanysecurityarchitecture,process,orapplication.
【中国标准分类号】:M11
【国际标准分类号】:35_040
【页数】:16P;A4
【正文语种】:英语