一类新的基于证书的代理盲签名

在Gentry提出的基于证书加密（CBE）概念的基础上,提出了构造基于证书签名（CBS）方案的一般性方法,并在此基础上,结合代理签名与盲签名,利用间隙Diffie-Hellman（GDH）群的特点,提出了一种基于证书的代理盲签名的新方案,分析表明该方案不仅克服了基于身份的代理盲签名方案不能有效抵抗伪造攻击并缺少不可链接性等缺陷,而且签名算法的效率也有明显提高。     

公平的消息传输协议

公平性是电子交易走向实际应用所必须解决的课题.提出了一个在电子商务环境下消息传输协议,目的是为了保证在消息传输协议终止后,双方都能收到对方消息或都收不到.该协议基于乐观模型,使用了可转化签名和非交互式零知识证明等技术.协议在实现有效性、公平性和不可抵赖性要求的基础上,还实现了透明的可信第3方,且生成的最终抗抵赖证据是标准的GDH签名（gap diffie-hellman signature）,这使得该协议既高效,又非常容易融入现有交易系统.     

The Nucleotide Sequence of a 39 kb Segment of Yeast Chromosome IV: 12 New Open Reading Frames,Nine Known Genes and One Gene for Gly-tRNA

The complete nucleotide sequence of a 39 090 bp segment from the left arm of yeast chromosome IV was determined. Twenty-one open reading frames (ORFs) longer than 100 amino acids and a Gly-tRNA gene were discovered. Nine of the 21 ORFs (D0892, D1022, D1037, D1045, D1057, D1204, D1209, D1214, D1219) correspond to the previously sequenced Saccharomyces cerevisiae genes for the NAD-dependent glutamate dehydrogenase (GDH), the secretory component (SHR3), the GABA transport protein (UGA4), the high mobility group-like protein (NHP2), the hydroxymethylbilane synthase (HEM3), the methylated DNA protein-cysteine S-methyltransferase (MGT1), a putative sugar transport protein, the Shm1 protein (SHM1) and the anti-silencing protein (ASF2). The inferred amino acid sequences of 11 ORFs show significant similarity with known proteins from various organisms, whereas the remaining ORF does not share any similarity with known proteins. The nucleotide sequence has been entered in the EMBL data Library under the Accession Number X99000.©1997 John Wiley & Sons, Ltd.     

基于双线性映射的一种前向安全的概率签名方案

在已有的概率签名方案的基础上提出了一种基于双线性映射的具有前向安全的概率签名方案。在该方案中，将签名周期分为T个时间段，在不同的时间段使用不同的密钥，而公钥在整个签名过程中保持不变。在不同的时间段所用的密钥由前一个时间段所用密钥经一个单向函数运算生成，保证了系统的前向安全性。此方案具有实现简单、安全性高、密钥更新快的特点。该文给出方案的有效性、安全性及前向安全证明。     

基于椭圆曲线的可验证密钥协商方案

分析当前密钥协商方案,讨论其安全性和攻击行为,并对GDH的安全性能和运算复杂度进行分析,根据安全性需要,给出了一种基于椭圆曲线的群密钥协商方案,该方案不仅提高实现效率并且可抵御主动攻击.     

发酵液中FDP的酶法分析

利用三种酶.即3-磷酸甘油脱氢酶、磷酸丙糖异构酶和醛缩酶,通过测定还原性辅酶1吸光值的变化来测定发酵液中FDP(1,6-二磷酸果糖)的含量。同时研究了pH、温度、pH对酶法测定结果的影响及最佳酶的加量。对FDP标准曲线进行了统计处理,结果表明:采用酶法测定FDP,其线性关系好.专一性强。对样品的重复测定表明,其相对测定相对偏差下超过0.6%,回收率101     

基于GDH群可证安全的门限签名方案

分析了Boneh等人的短签名方案和Boldyreva门限签名方案茵不具备概率签名特性而可能存在的一种对比攻击；然后基于Gap Diffie-Hellman（GDH）群设计了一个概率型的门限签名方案，并在随机预言模型（Random Oracle Model）下证明了方案的安全性。所提出的方案可以避免对比攻击的风险，并且其安全性不低于Boldyreva方案的安全性，即提供了健壮性和在选择消息攻击下的不可伪造性，并能容忍t〈n／2个恶意用户的勾结。本文的方案可作为Boldyreva方案的改进。     

可三方使用的电子现金*

提出了可三方使用的电子现金方案,使用该方案,用户U在某地提取电子现金时,Alice和Bob也可以在异地通过开放网路下载并且使用这些电子现金,用户U也可使用.     

Modelling and optimization of the smart hybrid renewable energy for communities (SHREC)

The future energy system in community level should be more ‘smart’ to secure reliability, enhance market service, minimize environmental impact, reduce costs and improve the use of renewable energy source (RES). Therefore, this paper proposes an energy integration system – smart hybrid renewable energy for communities (SHREC). It considers both thermal (heating and cooling) and electricity market in a large community level and highlight the interactions between them through utilizing RES, combined heat and power (CHP) and energy storages. A planning model based on CHP modelling is developed for the SHREC system. A linear programming (LP) algorithm is developed to optimize the SHREC system in a weekly period and the results are compared with an existing energy optimization software. We also demonstrate the model in a sample SHREC system during three typical weeks with cold, warm and mid-season weather in the year 2011. The results indicate that the developed modelling and optimization method is more efficient and flexible for the smart hybrid renewable energy systems.