一类基于秘密共享的量子密码方案的分析

最近杨宇光等人利用经典秘密共享给出一系列量子密码方案.其基本思想是将量子密钥共享给n个不同的成员,使得这些成员可以辅助实现量子身份认证、代理签名和量子安全直接通信.然而在实际应用中,这些方案继承了经典秘密共享方案的缺点,不能提供每个成员诚实参与协议的证明,任何恶意不合作行为只有最后才能被发现,从而使这类量子密码方案的使用效率很低.其次,由于这些方案使用了比特异或运算,使方案还存在一个更严重的攻击：如果任意两个成员合谋,可以改变他们原有的影子值,并且可以无障碍的使用新的影子参与量子密码方案,破坏协议执行的目的,使方案的门限彻底失效.此攻击是量子密码方案除密钥安全外的一种新的攻击形式.     

基于线性方程组的秘密共享方案

在门限方案中,密钥被所有成员秘密共享,而当一定数量的成员合作时,该密钥可以恢复.一个(t,n)门限方案就是将密钥K分给n个成员,而任意t个成员合作可以生成密钥K,但只有t-1个成员或者更少的成员不能生成该密钥.大多数(t,n)门限方案都基于Lagrange插值多项式或者是同余理论.文章提出了一种新的基于多元一次多项式的...     

基于线性方程组的秘密共享方案

在门限方案中,密钥被所有成员秘密共享,而当一定数量的成员合作时,该密钥可以恢复.一个(t,n)门限方案就是将密钥K分给n个成员,而任意t个成员合作可以生成密钥K,但只有t-1个成员或者更少的成员不能生成该密钥.大多数(t,n)门限方案都基于Lagrange插值多项式或者是同余理论.文章提出了一种新的基于多元一次多项式的秘密共享门限方案.     

家用机械三维密码锁

本文介绍一种拨盘式机械密码锁,通过依次旋转三个密码盘分别控制锁舌上下、前后以及绕自身轴线旋转三个自由度内的运动从而实现锁舌的定位,当密码正确时插入钥匙就可以通过钥匙的驱动将门打开。     

一个新的有特权集的秘密共享方案

对特定的秘密共享方案进行了研究,基于LUC密码体制构造了一个新的有特权集的秘密共享方案.该方案利用参与者的私钥作为子秘密,秘密分发者不需要进行子秘密的分配,每个参与者只需要维护一个子秘密就可以共享多个秘密,方案更有效.在秘密重构过程中,每个参与者都能验证其他参与者是否诚实提交了子秘密,增强了安全性.方案的安全性基于LUC密码体制和(t,n)门限方案,分析结果表明,其整体性能及安全性良好.     

可公开验证的秘密分享机制

背包公钥密码体制具有快速加密和解密的优点.利用新的背包算法,提出了一个可公开验证的动态秘密分享方案,该秘密分享方案在保持各成员子秘密不变的情况下可以分享多个秘密,并且每个参与者可以对自己的子秘密及其他成员提供的信息进行验证;不但能有效阻止敌手窃取秘密信息,也能有效地防止内部成员之间的互相欺诈.     

基于单片机的红外遥控电子密码锁设计与仿真

为了更方便地对电子密码锁进行控制和操作,设计了以AT89C52为控制核心的红外遥控电子密码锁。系统通过红外遥控发射电路UPD6121G输入密码,HS0038对接收到的红外密码进行解码处理,驱动继电器控制的电磁锁解锁;也可通过锁体键盘按键输入密码解锁。系统同时具有液晶显示、声光报警、密码修改等功能。本文详细介绍了电子锁的结构组成、工作原理、软件工作流程,并通过Proteus模拟仿真,测试验证了密码锁各项功能均满足设计要求。最后按照仿真原理,做出了电子锁的实物开发板。本系统安全可靠,广泛适用于家庭、旅馆仓库、货站等日常生活中。     

中国专利集锦

无线电子密码锁 无线电子密码锁由无线发射钥匙和接收开启锁组成。无线发射钥匙由E~2PROM、CPU编码器、密码发射电路和发射天线构成;接收开启锁由接收天线、接收电路、混频解调器、CPU检码器、E~2PROM和开启控制器构成。E~2PROM中的密码可通过能与计算机连接的接口写入,具有保密性强、误码率低、体积小和成本低等优点,可广泛应用于宾馆、家庭、办公场所的防盗门锁和汽车门锁等。     

怎样防止偷打程控电话?

如今,许多单位和家庭都用上了程控电话,程控电话的功能很多,仅供用户服务的项目就有10几种。其中“呼叫加锁”功能,就是专门防止他人偷用电话的。 “呼叫加锁”又叫“呼出限制”,它如同在电话机上加了一把“电子密码锁”。密码号只有用户自己和有关人员知晓。当你外出办事时,你可以拨打你的密码号,将电话“锁”住。     

无门电子保险柜

无门电子保险柜是浙江义乌电子保险柜厂同多所高等院校、科研单位共同研制而成的国家专利产品。该保险柜集机械电子为一体。柜体由高强度材料制成的壳体、液压系统、电子密码遥控系统、电子报警系统等部件组成。其特点是无门,遥控操作,安全性强,可根据用户需要任意变换密码;自动锁紧后抗动力可达     

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.     

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.     

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.     

A computer generator for randomly layered structures

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

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.