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1、1000-9825/2003/14(12)2052©2003JournalofSoftware软件学报Vol.14,No.12∗安全组播中密钥分配问题的研究+朱文涛,熊继平,李津生,洪佩琳(中国科学技术大学电子工程与信息科学系,安徽合肥230027)AStudyoftheKeyDistributioninSecureMulticast+ZHUWen-Tao,XIONGJi-Ping,LIJin-Sheng,HONGPei-Lin(DepartmentofElectronicEngineeringandInformationScience,Unive
2、rsityofScienceandTechnologyofChina,Hefei230027,China)+Correspondingauthor:Phn:86-551-3603634,Fax:86-551-3601334,E-mail:wtzhu@263.nethttp://eeis.ustc.edu.cn/Received2003-02-27;Accepted2003-09-15ZhuWT,XiongJP,LiJS,HongPL.Astudyofthekeydistributioninsecuremulticast.JournalofSoftw
3、are,2003,14(12):2052~2059.http://www.jos.org.cn/1000-9825/14/2052.htmAbstract:Multicastisapreferrednetworkcommunicationtechniqueinthecaseofmultiplerecipients,whoseimportancehasbeenincreasinglyhighlightedwiththedevelopmentoftheInternet.IGMP,themulticastmanagementprotocol,doesno
4、tprovideaccesscontroloftheusers.Inordertoprotectcommunicationconfidentiality,trafficinsecuremulticastisencryptedwithaSessionEncryptionKey(SEK)whichisknownonlytothecertificatedgroupmembers.Wheneverthereisachangeinthegroupmembership,theSEKhastobedynamicallyupdated,thusthekeydist
5、ributionbecomesakeyproblemintheresearchofsecuremulticast.Indesigningkeydistributionalgorithms,communicationcosts,keystorage,protectionagainstattacksandcomputationcomplexityareconsideredasthefourimportantfactors.Agroupkeydistributionschemeutilizingapolynomialexpansionisproposed
6、,whichfeaturesinnotraditionalencryptionanddecryption.Analysesshowthatitperformswellinsmallscalemulticast.ThispolynomialexpansionbasedalgorithmisthenintegratedwiththeLogicalKeyHierarchy;whilepreservingthelogarithmiccommunicationcostwiththegroupsize,thepresentedPE-LKHschemelower
7、sthecomputationcomplexityobservably,thusisscalabletolargedynamicgroups.Keywords:securemulticast;communicationconfidentiality;keydistribution;polynomialexpansion;logicalkeyhierarchy摘要:组播是面向组接收者的首选网络通信技术,其重要性随着Internet的发展日益突出.组管理协议IGMP不提供成员接入控制.为了保护通信机密性,安全组播使用仅为认证组成员所知的会话加密密钥(S
8、EK)来加密业务数据.每当组成员关系发生变化时,都应动态更新SEK,密钥分配也就成为安全组播研究的关键问题.在设计密∗Su
