构筑IPv6协议下的安全邮件系统

在分析PGP协议和IPsec协议的基础上，提出一种安全邮件系统的基本结构．并对邮件传输流程进行分析，初步实现了邮件在IPv6环境下发送、接收、加密、解密、签名、验证等功能。同时，系统融合了PGP的密钥证书管理功能，为电子邮件用户提供端到端的安全服务，实现了邮件在传输过程中的保密性、完整性、发送方和接收方身份认证以及不可否认性等。     

PGP——保护电子邮件的新方法

电子邮件是互联网的重要应用之一 ,它的安全性已越来越受到人们的关注。首先介绍了互联网上加密电子邮件的新软件—— PGP,具体分析了用 PGP加、解密电子邮件的详细过程 ,并简单讨论了 PGP的安全性能 ,最后分析了目前最常用的电子邮件上的 PGP加密功能。     

Production of Plant Beneficial and Antioxidants Metabolites by Klebsiella variicola under Salinity Stress

Bacteria that surround plant roots and exert beneficial effects on plant growth are known as plant growth-promoting rhizobacteria (PGPR). In addition to the plant growth-promotion, PGPR also imparts resistance against salinity and oxidative stress and needs to be studied. Such PGPR can function as dynamic bioinoculants under salinity conditions. The present study reports the isolation of phytase positive multifarious Klebsiella variicola SURYA6 isolated from wheat rhizosphere in Kolhapur, India. The isolate produced various plant growth-promoting (PGP), salinity ameliorating, and antioxidant traits. It produced organic acid, yielded a higher phosphorous solubilization index (9.3), maximum phytase activity (376.67 ± 2.77 U/mL), and copious amounts of siderophore (79.0%). The isolate also produced salt ameliorating traits such as indole acetic acid (78.45 ± 1.9 µg/mL), 1 aminocyclopropane-1-carboxylate deaminase (0.991 M/mg/h), and exopolysaccharides (32.2 ± 1.2 g/L). In addition to these, the isolate also produced higher activities of antioxidant enzymes like superoxide dismutase (13.86 IU/mg protein), catalase (0.053 IU/mg protein), and glutathione oxidase (22.12 µg/mg protein) at various salt levels. The isolate exhibited optimum growth and maximum secretion of these metabolites during the log-phase growth. It exhibited sensitivity to a wide range of antibiotics and did not produce hemolysis on blood agar, indicative of its non-pathogenic nature. The potential of K. variicola to produce copious amounts of various PGP, salt ameliorating, and antioxidant metabolites make it a potential bioinoculant for salinity stress management.     

WebMail方式下安全邮件的实现

针对WebMail方式收发邮件安全性差的缺陷，提出了一种实现安全邮件的方法，该方法增加了加密、认证机制，设置公钥服务器以保证公钥获取的方便与安全，并通过IE插件的形式与IE浏览器集成。实践证明，该方法在不改变原有收发邮件方式的基础上，增加了安全特性。     

基于PGP信任模型的Web服务统一身份认证研究

针对Web Service应用中身份管理上存在的安全问题,设计了一个Web Services统一身份认证方案,描绘了认证体系架构,阐述了认证原理,分析了其关键技术.该方案以PGP信任模型为基础,结合现代对称密码和非对称密码认证技术,为各WebServices提供了强身份认证,能简易地实现单点登录,并应用于实践.