基于一次性口令和椭圆曲线密码体制的移动商务身份认证协议设计与研究

移动商务的身份认证问题已成为制约移动商务发展的瓶颈.一次性口令技术实现简单、成本低、无须第三方认证的特点使其较适合移动商务的身份认证.通过椭圆曲线密码体制实现数字签名和密钥协商,提出基于一次性口令和椭圆曲线密码体制的移动商务身份认证协议,并利用串空间方法证明协议的安全性.     

基于OTP的移动商务身份认证机制设计与研究

移动商务的身份认证问题已成为制约移动商务发展的瓶颈.一次性口令(OTP)技术实现简单、成本低、无须第三方认证的特点使其较适合移动商务的身份认证.利用椭圆曲线密码体制实现数字签名,提出一套基于OTP的移动商务身份认证机制,最后利用BAN逻辑方法证明了该机制的安全性.     

云环境下基于PKI的一次性口令身份认证系统设计

当前身份认证系统口令设计过程复杂,不仅容易出现认证错误的现象,而且大大增加了计算复杂度,影响整体性能。为此,提出一种新的云环境下基于PKI的一次性口令身份认证系统,给出设计系统总体结构,其主要由CA证书服务模块、RA注册模块、认证模块与用户模块构成。身份认证选用用户数字证书与一次性口令相结合的形式,对用户名与一次性口令进行验证时,通过用户名得到其数字证书,利用“挑战-应答”协议判断用户是否合法。介绍了一次性口令生成技术,给出公开大素数与保密大素数的确定过程。实验结果表明,采用所设计系统对云环境下用户进行身份认证,不仅认证精度高,而且整体性能强。     

云环境下公钥基础设施的一次性口令身份认证系统设计

当前身份认证系统口令设计过程复杂,不仅容易出现认证错误的现象,而且大大增加了计算复杂度,影响整体性能。为此,提出一种新的云环境下基于PKI的一次性口令身份认证系统。给出设计系统总体结构,其主要由CA证书服务模块、RA注册模块、认证模块与用户模块构成。身份认证选用用户数字证书与一次性口令相结合的形式,对用户名与一次性口令进行验证时,通过用户名得到其数字证书,利用"挑战-应答"协议判断用户是否合法。介绍了一次性口令生成技术,给出公开大素数与保密大素数的确定过程。实验结果表明,采用所设计系统对云环境下用户进行身份认证,不仅认证精度高,而且整体性能强。     

本期导读

"计算机与自动化"栏目中,王秦等的《移动商务环境下身份认证机制的研究》,提出了移动商务身份认证机制的设计需求和设计原则,指出身份认证、密钥协商以及抵御常见攻击是移动商务身份认证机制设计的主要内容。牛芳等的《基于离散频带的中继协作网络频谱聚合     

移动商务环境下身份认证机制的研究

与有线网络相比,无线信道资源短缺、带宽成本高、时延长、连接可靠性较低,同时,移动终端的资源有限、处理能力低、存储能力小,因此,必须针对移动商务的环境特点设计移动商务的身份认证机制。通过分析无线通信网络和移动终端的特点,提出了移动商务身份认证机制的设计需求和设计原则,指出身份认证、密钥协商以及抵御常见攻击是移动商务身份认证机制设计的主要内容。     

一次性口令在身份认证中的应用

一次性口令系统是一种新型身份认证机制,它克服了传统静态口令的固有缺陷,大大提高了口令系统的安全性,在身份认证领域应用前景十分广阔。     

一次性口令身份认证方案的分析与改进

介绍了一次性口令技术的工作原理及实现机制,并分析其在防止小数攻击方面的脆弱性,提出了改进的双备份型一次性口令身份认证方案,解决了口令传输的安全问题,有效抵御网络窃听攻击,增强认证系统的安全性。     

网络在线安全预警中一次性口令身份认证方法的实现

当前网络在线安全预警中身份认证方法大多通过静态口令实现,不仅易于猜测,而且容易被窃听,安全性较差。为此,提出一种新的网络在线安全预警中一次性口令身份认证方法,给出一次性口令身份认证原则,在进行用户注册的过程中,令用户输入注册的用户ID、用户口令PW及两个随机数,对上述数据进行计算,获取首次认证数据,经安全信道传输至服务器中储存,以供第一次认证使用。给出用户登录服务器时一次性口令身份认证的详细过程。实验结果表明,所提方法在用户数量较多和内部用户、外部用户均冒充合法用户的情况下,均可保持较高的认证精度,且认证效率高。     

一种改进的OTP身份认证算法分析与实现

分析一次性口令技术认证的优缺点,并在此基础上综合采用RSA、MD5等多种加密算法,设计出一种通过双向认证的新型一次性口令身份认证模型。结果表明,模型可以有效防御原有一次性口令认证存在的漏洞,如中间人攻击等,在安全性要求较高的场合下能够保障信息系统的安全。     

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

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。     

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.     

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.