广播加密与叛逆者追踪及其在电子商务中的应用

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1、西安电子科技大学博士学位论文广播加密与叛逆者追踪及其在电子商务中的应用姓名：吕锡香申请学位级别：博士专业：密码学指导教师：杨波20070401密方案。方案中利用Weil配对的双线性特性并结合简单多项式实现了以前方案所不具有的密钥托管，使得方案具有全程托管功能，允许托管代理用一个简单的密钥解密任意公开钥所加密的密文，有利于系统管理者管理整个系统，也有利于有关部门对整个行业实施监管。在同等安全级别下，相对于传统基于有限域上离散对数问题的叛逆者追踪，该方案在效率上占有相当优势。(8)针对实际应用需求提出

2、了一种面向多种服务的广播加密。在该方案中用户的存储需求与其订购的服务数无关，并且在订购更多服务、撤销所订购服务、提供新的服务项目和系统更新时用户的解密密钥都无需更新。关键词：叛逆者追踪广播加密数字版权保护基于身份的密码学快速公钥密码AbstractTraitortracingschemesareveryUsefultoolsforpreventingpiracyindigitalcontentdistributionsystems．Broadcastencryptionassuresthatonl

3、ylegitimateuserswillreceivetheplaintextdatum，andtraitortracingenhancesthedefenceagainstpirates．Atraitortracingprocedureallowsthesystem-managertorevealtheidentitiesofthesubscribersthatwereimplicatedintheconstructionofapirate-devicethatillegallyreceives

4、thedigitalcontent(calledtraitors)．Intheareaofbroadcastencryptionandtraitortracing，theauthorachievesthefollowingmainresults．(1)Anewidentity-basedpublic-keytraitortracingschemeisconstructedbyusingtheidentity—basedencryptionschemeofBonehandFranklin．Thiss

5、chemeisthefirstconcreteconstructionofasymmetrictraitortracingmechanismthatdoesnotrelyontrustedagentsandnotusethecostlyObliviousPolynomialEvaluationmechanism．(2)Anidentity—basedpublic—keybroadcastencryptionschemeisproposedbyusingthe“subset-cover'’frame

6、workandtheidentity-basedencryptionschemeofBonehandFranklin．Withthesubset-covermechanism，theenablingheaderfromtheencryptedsessionkeyisshorterandtheschemecanworkforthelarge-scalebroadcastsystem．Therealizationofasymmetryandnon·repudiationdoesnotrelyontru

7、stedagentsandthecostlyObliviousPolynomialEvaluationmechanism．(3)Anasymmetricpublic—keytraitortracingschemeisproposedbasedonthebilinearmaponellipticcurves．Theachievementistheabsoluteblack-boxtracing，theperfectrevocationpropertyandprovablesecurity．These

8、curityoftheschemeisbasedonthedifficultyofBilinearDecisionDiffie—Hellman(BDDH)problemonellipticcurves．(4)Wehaveanin—depthstudyonfastpublic·keycryptosystemNTRU．Anewtraitortracingschemeisproposedbyusingtheefficientandcomputationallyinexpensivepub