SAE AMS7269 Rings, Sealing, Silicone (Pvmq) Rubber, Low Outgassing, Space and Vacuum Service 45-55
时间:2024-05-14 02:48:36 来源: 标准资料网 作者：标准资料网 阅读：9759
Product Code:SAE AMS7269
Title:Rings, Sealing, Silicone (Pvmq) Rubber, Low Outgassing, Space and Vacuum Service 45-55
Issuing Committee:Ams Ce Elastomers Committee
Scope:This specification covers a low-outgassing silicone (PVMQ) rubber compound in the form of molded rings. Primarily for use in interplanetary space and other hard vacuums from -75 degrees to +150 degrees C (-103 degrees to +302 degrees F), with a minimum of condensable outgassing products. While within the earth's atmosphere, the silicone rubber compound is resistant to deterioration by ozone, smog, and weathering
【英文标准名称】:Informationtechnology-Securitytechniques-Digitalsignatureschemesgivingmessagerecovery-Integerfactorizationbasedmechanisms
【原文标准名称】:信息技术.安全技术.具有信息恢复功能的数字签名方案.基于整数因子分解机制
【标准号】:BSISO/IEC9796-2-2002+A1-2008
【标准状态】:作废
【国别】:英国
【发布日期】:2002-10-24
【实施或试行日期】:2002-10-24
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:数据交换;数据处理;数据保护;数据安全;数据传输;定义;数字的;数字签名;识别;信息交换;信息技术;安全;签名;文本处理
【英文主题词】:Dataexchange;Dataprocessing;Dataprotection;Datasecurity;Datatransmission;Definition;Definitions;Digital;Digitalsignature;Digitalsignatures;Identification;Informationinterchange;Informationtechnology;Safety;Signatures;Textprocessings
【摘要】:ThispartofISO/IEC9796specifiesthreedigitalsignatureschemesgivingmessagerecovery,twoofwhicharedeterministic(non-randomized)andoneofwhichisrandomized.Thesecurityofallthreeschemesisbasedonthedifficultyoffactorizinglargenumbers.Allthreeschemescanprovideeithertotalorpartialmessagerecovery.ThemethodforkeyproductionforthethreesignatureschemesisspecifiedinthispartofISO/IEC9796.However,techniquesforkeymanagementandforrandomnumbergeneration(asrequiredfortherandomizedsignaturescheme),areoutsidethescopeofthispartofISO/IEC9796.Usersofthisstandardare,whereverpossible,recommendedtoadoptthesecondmechanism(Digitalsignaturescheme2).However,inenvironmentswheregenerationofrandomvariablesbythesignerisdeemedinfeasible,thenDigitalsignaturescheme3isrecommended.Digitalsignaturescheme1shallonlybeusedinenvironmentswherecompatibilityisrequiredwithsystemsimplementingthefirsteditionofthisstandard.However,Digitalsignaturescheme1isonlycompatiblewithsystemsimplementingthefirsteditionofthisstandardthatusehash-codesofatleast160bits.
【中国标准分类号】:L70
【国际标准分类号】:35_040
【页数】:62P.;A4
【正文语种】:英语