敏感数据库加密算法与密钥管理

先提出了敏感数据库对加密技术的特殊要求,接着论述了常用敏感数据库的加密方法,最后对数据库密钥的生成、密钥的存储和更换三个方面进行了讨论.     

一种基于PGP和信息隐藏技术的信息加密方法

随着互联网在社会各领域的广泛应用和宽带的迅猛发展,网络安全问题更加严峻。本文介绍了PGP和信息隐藏技术这两种典型的加密方式,并提出了一种基于这两种加密方式的组合加密方法。     

Two Triangulation Methods Based on Edge Refinement

In this paper two curvature adaptive methods of surface triangulation are presented. Both methods are based on edge refinement to obtain a triangulation compatible with the curvature requirements. The first method applies an incremental and constrained Delaunay triangulation and uses curvature bounds to determine if an edge of the triangulation is admissible. The second method uses this function also in the edge refinement process, i.e. in the computation of the location of a refining point, and in the re-triangulation needed after the insertion of this refining point. Results are presented, comparing both approaches.     

Length Preserving Multiresolution Editing of Curves

In this paper a method for multiresolution deformation of planar piecewise linear curves that preserves the curve length is presented. In a wavelet based multiresolution editing framework, the curve can be deformed at any level of resolution through its control points. Enforcing the length constraint is carried out in two steps. In a first step the multiresolution decomposition of the curve is used in order to approximate the initial curve length. In a second step the length constraint is satisfied exactly by iteratively smoothing the deformed curve. Wrinkle generation is an application the paper particularly focuses on. It is shown how the multiresolution definition of the curve allows to explicitly and intuitively control the scale of the generated wrinkles.     

IDEA的随机群和随机置换

提出了对迭代分组密码IDEA的轮函数的两种强化方法———随机群和随机置换 .叙述并了证明了强化对IDEA的改善效果 ,并通过对代价的考虑说明强化是值得的 .     

ANTARES: The first undersea neutrino telescope

The ANTARES Neutrino Telescope was completed in May 2008 and is the first operational Neutrino Telescope in the Mediterranean Sea. The main purpose of the detector is to perform neutrino astronomy and the apparatus also offers facilities for marine and Earth sciences. This paper describes the design, the construction and the installation of the telescope in the deep sea, offshore from Toulon in France. An illustration of the detector performance is given.     

Failure of a soft cohesive soil subjected to combined static and cyclic loading

This paper describes the type of failure that a soft cohesive soil can exhibit when acted upon by combined static and cyclic loading. The conclusions are based on the results of a comprehensive experimental research in which, in addition to identification and classification testing, 15 monotonic simple shear tests and 138 cyclic simple shear tests were carried out in which, prior to the cyclic shear stresses, different levels of monotonic shear stresses were applied. Laboratory tests were performed on undisturbed samples taken from the southern area of the port of Barcelona, Spain. In general, the results thus obtained indicate that the undrained shear strength for a given number of cycles is clearly affected by the initial shear stress, as it is explained in this paper.     

IDEA密钥空间扩展研究

IDEA是一个著名的加密算法,最著名的是PGP。介绍并改进了标准IDEA算法,提出了扩展密钥空间的算法,把密钥从128位扩展到832位,极大地增强了IDEA算法的安全性,同时又对一种新的扩展IDEA算法的方法进行了探讨,把IDEA算法从16位移植到32位,密钥空间加倍,块的大小也加倍,密钥空间最大可达到21664。     

数据加密技术探究

在信息时代,数据的安全是非常重要的,加密是保证数据安全的主要方法之一,加密时要选择恰当的算法。文中主要介绍了对称加密和非对称加密算法。对称加密技术中以DES加密算法为例,介绍了它的加解密过程,非对称加密以RSA加密算法为例,介绍加解密过程并给出加解密过程素数生成参考代码。     

甘蔗新品种粤糖07-516选育及特性特征

详细阐述了早熟、高产、高糖、抗病性好的甘蔗品种粤糖07-516的选育过程,并就其农艺性状、蔗茎产量、蔗糖分、抗性等性状表现进行了综合分析。以粤糖00-236为母本,桂糖96-211(桂糖26号)为父本配制杂交组合,历经8代农艺性状、糖分和产量相关性状的选择,育成了早熟、高产、高糖、抗逆性强的甘蔗新品种粤糖07-516。通过国家区试和生产试验,结果表明,粤糖07-516蔗茎产量达108203.06 kg/hm~2,含糖量达16898.59 kg/hm~2。该品种适合我国蔗区大面积推广应用。