一种mIBS方案的分析与改进

魏松杰等人提出一种基于安全仲裁SEM（security mediator）的mIBS（identity based signature）方案,利用SEM节点实现用户身份实时撤销。mIBS方案中,SEM持有部分用户私钥,与签名者共同完成签名。对mIBS方案进行了安全性分析,发现该方案存在严重安全缺陷,并给出一个具体的攻击实例。在攻击实例中,签名者通过与SEM的一次正常签名交互,窃取SEM持有的部分私钥,进而绕开SEM单独实施签名,使得SEM失效。提出一种改进的mIBS方案（记为mIBSG）,对SEM持有的部分私钥增加了随机性保护。进一步,建立了mIBS方案安全模型mEUF-CMIA（existential unforgeability under adaptive chosen message and identity attacks）,重点讨论了其敌手模型。除传统IBS敌手外,mEUF-CMIA模型定义第二种类型敌手模拟一个恶意但合法的签名者,通过访问随机预言机,在没有SEM参与的情况下独立产生签名。在mEUF-CMIA模型下,mIBSG方案的不可伪造性被归约为求解循环群上的CDH问题。对比分析表明,mIBSG方案以较小的计算代价实现了可证明安全性。mIBSG方案可用于构建基于IBC的跨域认证系统。     

基于ECC-ZKP的农产品供应链可控身份管理与认证模型

基于区块链的农产品供应链中,当参与主体数量规模越来越大时,节点与企业之间的1：1匹配关系将造成节点数量众多,从而造成网络开销大、共识效率低等问题。针对这些问题,引入中间件使得节点与企业之间1：1关系变为1：n的关系,对所涉及到的企业身份管理以及相互之间的认证,提出一种基于ECC-ZKP（elliptic curve cryptosystem-zero—knowledge proof）的可控身份管理与认证模型,实现身份的可控管理和完成可信交易前所需要的身份认证。通过模型分析和仿真实验分析结果表明,该模型能够提供较高的安全性,能够有效进行身份的管理和认证,且节点与企业之间1：n关系相比较于1：1关系减少了网络开销并提高了共识效率。     

Creativity in non‐routine jobs: The role of transformational leadership and organizational identification

An increasing number of individuals work in jobs with little standardization and repetition, that is, with high levels of job non‐routinization. At the same time, demands for creativity are high, which raises the question of how employees can use job non‐routinization to develop creativity. Acknowledging the importance of social processes for creativity, we propose that transformational leaders raise feelings of organizational identification in followers and that this form of identification then helps individuals to develop creativity in jobs with little routinization. This is because organizational members evaluate and promote those ideas as more creative, which are in line with a shared understanding of creativity within the organization. To investigate these relationships, we calculated a mediated moderation model with 173 leader–follower dyads from China. Results confirm our hypotheses that transformational leadership moderates the relationship between job non‐routinization on employee creativity through organizational identification. We conclude that raising feelings of social identity is a key task for leaders today, especially when working in uncertain and fast developing environments with little repetition and the constant need to develop creative ideas.     

人群头发元素分布及某些特征研究

本文介绍用堆中子活化分析法测定人群头发中I、Br、Mg、Mn、Cu、Na、V、Cl、Al、Ca、S等11种元素。研究人发中元素分布特征、相关性特征、性别年令分布特征。方法学中还从法庭科学应用角度介绍同一性识别中差异率和重合几率的双判据方法。     

The Landscape of microRNAs in βCell: Between Phenotype Maintenance and Protection

Diabetes mellitus is a group of heterogeneous metabolic disorders characterized by chronic hyperglycaemia mainly due to pancreatic β cell death and/or dysfunction, caused by several types of stress such as glucotoxicity, lipotoxicity and inflammation. Different patho-physiological mechanisms driving β cell response to these stresses are tightly regulated by microRNAs (miRNAs), a class of negative regulators of gene expression, involved in pathogenic mechanisms occurring in diabetes and in its complications. In this review, we aim to shed light on the most important miRNAs regulating the maintenance and the robustness of β cell identity, as well as on those miRNAs involved in the pathogenesis of the two main forms of diabetes mellitus, i.e., type 1 and type 2 diabetes. Additionally, we acknowledge that the understanding of miRNAs-regulated molecular mechanisms is fundamental in order to develop specific and effective strategies based on miRNAs as therapeutic targets, employing innovative molecules.     

数据库加密系统中基于X.509证书的椭圆曲线加密身份认证机制*

身份认证问题是网络安全的重要研究课题,利用椭圆曲线密码系统相对于其他公钥密码体制具有密钥长度短、运算速度快、计算数据量小的特点,结合X.509证书构建一个新的、高效的、安全的身份认证方案.     

Chronically Elevated Exogenous Glucose Elicits Antipodal Effects on the Proteome Signature of Differentiating Human iPSC-Derived Pancreatic Progenitors

The past decade revealed that cell identity changes, such as dedifferentiation or transdifferentiation, accompany the insulin-producing β-cell decay in most diabetes conditions. Mapping and controlling the mechanisms governing these processes is, thus, extremely valuable for managing the disease progression. Extracellular glucose is known to influence cell identity by impacting the redox balance. Here, we use global proteomics and pathway analysis to map the response of differentiating human pancreatic progenitors to chronically increased in vitro glucose levels. We show that exogenous high glucose levels impact different protein subsets in a concentration-dependent manner. In contrast, regardless of concentration, glucose elicits an antipodal effect on the proteome landscape, inducing both beneficial and detrimental changes in regard to achieving the desired islet cell fingerprint. Furthermore, we identified that only a subgroup of these effects and pathways are regulated by changes in redox balance. Our study highlights a complex effect of exogenous glucose on differentiating pancreas progenitors characterized by a distinct proteome signature.     

基于MMS替代协议的变电站安全通信技术研究及应用

目前,绝大多数变电站基于IEC61850标准建设,站内通信协议主要包括制造报文规范(MMS)、面向通用对象的变电站事件(GOOSE)、采样测量值(SMV)等,在工程应用实践中逐渐暴露出一些不足与安全隐患.为此,基于MMS替代协议,重点介绍了其实现的功能与安全防护技术.在功能方面,MMS替代协议增加了多个服务,并优化了现有MMS协议的不足;在安全防护技术方面,MMS替代协议的应用层实现了基于SM2算法与调度证书的双向身份认证,杜绝未授权设备的非法接入、攻击,从协议源头杜绝设备连接的不安全性;MMS替代协议的传输层实现了基于SM2算法与调度证书的全链路加密、认证,确保传输数据报文防伪造、防抵赖、防窃取,保护数据报文的机密性、完整性.测试结果表明MMS替代协议在工程应用中具有一定的参考意义.     

改进的Ke rbe ros协议在HDFS环境下的研究

由于Kerberos认证模型是中心管理方式,当Kerberos应用于大型的分布式网络中时,会产生服务器的瓶颈问题。为扩大Kerberos的应用范围,使其很好的与分布式系统HADOOP结合,对Kerberos在HDFS环境下的应用进行研究和描述,针对Kerberos密钥分发中心的瓶颈问题和 HADOOP分布式文件系统的特殊需求,提出改进的Kerberos协议模型。该模型结合分布式思想,且对协议的消息传递模型进行改进。仿真结果表明,该协议解决了 HADOOP分布式文件系统集成Kerberos的缺点,提升了 HADOOP分布式文件系统的存储安全以及分布式文件系统的用户认证效率。     

苯酚降解菌MW-1的分离及其降解特性研究

用以苯酚为唯一碳源和能源的无机盐驯化液对沈阳某煤气厂土壤进行驯化培养,从中分离筛选到1株苯酚降解菌,编号为MW-1。该菌株最高可耐受1600 mg/L苯酚,其降解性能研究表明:该菌具有较强的苯酚降解能力,在30°C,pH 5.5~7.5,装液量为60 mL,接种量20%,摇床振荡速度120 r/min的条件下,振荡培养6 h后可使400 mg/L的苯酚降解率达80%以上。虽然葡萄糖对该菌体的生长及降解苯酚均有一定的抑制作用,但有葡萄糖(600 mg/L)存在的情况下,该菌对苯酚的降解率仍接近60%。这对处理含有其它碳源的含酚废水具有一定的意义。