保护移动Agent的电子交易安全方案

根据对移动Agent在恶意主机上安全问题的分析 ,给出了一个安全的电子交易方案 .该方案改进了强代理签名安全机制 ,使用不可拆分数字签名技术、公钥加密算法和时间戳 ,可以保证客户身份不可仿冒且要求不可拆分、商家身份不可仿冒且开价不可拆分、商家的身份和开价信息对其他商家保密 ,同时还可以抵抗客户或商家通过重放攻击来迫使对方进行额外的交易 .     

基于电子钱包的移动微支付方案

为了使移动微支付方案能够提供更安全便捷的支付服务,设计了一种基于电子钱包的微支付方案.该方案由用户、商家、可信支付平台(trusted payment platform,TPP)共同组成,电子钱包作为联系用户和商家的安全平台,可协助用户安全地完成移动微支付交易,且实现对微支付账户的管理和更新.利用哈希链生成支付节点,使用对称加密算法和公钥签名算法对数字交易过程进行加密并提供身份认证服务.结果表明,电子钱包的引入可以及时检测到用户的二次花费,该方案安全性能好,系统运行效率高.     

一种基于智能卡的增强型身份鉴别方案

在分析现有的基于智能卡身份鉴别方案安全缺陷的基础上,提出了一种增强的身份鉴别方案.该方案不但能够保留现有身份鉴别方案的优点,而且能够很好的抵抗拒绝服务攻击,离线字典攻击和重放攻击.     

基于身份的在线离线签名

本文通过使用双线型配对技术，提出了一种高效的基于身份的在线／离线签名方案。在随机预言机模型中，基于强Diffie—Hellman假设，方案是可证安全的。其安全性满足在适应性选择消息和身份攻击下的存在性不可伪造。相对于已有方案，其签名验证算法只需要一次配对运算，因此具备更高的效率.     

基于身份的多服务器认证密钥协商方案

将基于身份的密码体制与远程多服务器密钥协商相结合,提出一种基于身份的远程多服务器密钥协商方案.用户注册时由私钥生成中心颁发私钥并安全存放于智能卡中.用户登录服务器前,双方采用基于身份的双线性配对计算进行双向身份认证,并协商生成会话密钥.服务器端无须保存口令表,用户端无须建立数据表存储相关登录信息,无须在终端能离线更改登录口令.该方案减少了密钥协商的通信开销、计算开销以及存储开销,在标准BR安全模型下该方案被证明是安全的.     

移动代理服务器的安全策略研究与实现

邮件传输安全是移动信息化的重要基础，借鉴已有的电子邮件加密技术，在移动代理服务器设计中采用基于SSL的通道加密的方案和基于3DES／AES的内容加密的方案来保证其邮件传输的安全；同时结合数字cA证书认证技术来保证相互间身份的鉴别。实际产品设计表明，该技术方案能胜任移动信息化对安全的要求。     

基于可验证秘密分享的移动代理安全支付协议

移动代理的安全问题是移动代理技术面临的一个很大障碍,为保护移动代理支付时的信息安全,采用Pedersen可验证秘密分享方案,设计了一个基于移动代理技术的安全支付协议．文中详细分析和讨论了协议的性能,包括安全性、不可否认性以及协议的运行效率．结果表明,和已有的方案相比,该协议在保证具有合适运行效率的同时,弱化了已有方案的安全执行条件,增加了系统的安全性和灵活性,因此具有更好的应用价值。     

基于身份的盲签名在移动电子支付中的应用

目前可行的基于身份数字签名方案大都是基于Weil Pairing或Tate Pairing实现的,而这两种实现体制的时间复杂度均比较高,不适于移动网络环境.针对上述问题,提出了一个基于身份的数字签名方案,在该方案中,KGC无法获得用户的身份和私钥,保护了用户的隐私性.文中在此基础上又提出了一个基于身份的盲签名方案.以上两种方案都是以椭圆曲线离散对数问题为基础,时间复杂度低、签名结果短,因此更适于移动网络环境.最后利用以上两种签名方案构造了一个轻便可分的电子支付方案,其计算量小,所需存储量少,网络传输流量较低,上述特点使其更适于移动网络环境.     

Ad Hoc网中无证书认证和密钥协商方案

基于ECC构造一个适合于Ad Hoc网的无证书认证和密钥协商方案,可实现分布式密钥产生、新成员加入和移动自组网任何两个成员之间的身份认证和会话密钥协商.移动自组网中每个成员在加入群组时可获得群组多个成员颁发的群组成员密钥和新成员自选的长期私钥.在安全通信中,只要用户有1个秘密值未泄露,那么新方案就是安全的,该方案能够同时满足无用户密钥托管、无密钥泄露伪装攻击和会话时用户临时私钥泄露也不会产生攻击,方案的安全性基于计算性DH困难问题和离散对数困难问题.     

移动电子商务微支付协议的改进

基于PKI(public key infrastructure)及Payword微支付机制,提出了一种只涉及到用户、商家和移动网络运营商的移动电子商务微支付协议。该支付协议适合于移动手机用户和大部分网络商家进行频繁交易,不仅保证了用户交易的安全性、不可否认性,还解决了交易商品只限于多媒体业务的瓶颈问题。同时在支付阶段提出暂扣付费的方案,在最大程度上保证了交易的公平性,有效地避免了恶意透支以及商业欺诈行为。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…