关于应用系统安全的研究

为中国证券监督管理委员会建立一个安全可靠的基于Internet/Intranet的应用系统框架;采用多方面的、多层次的、多种技术结合的安全机制,包括身份认证、数据加密、数字签名、Domino和WWW服务器、存取控制表、目录服务、认证服务器、IC卡等技术;构造的基于CA服务器的认证系统是一个高效、便利且可靠性高的系统,采用的加密技术和安全机制也被实践证明是值得信赖的.基于CA服务器的认证系统安全性高、保密性好,值得在对系统安全有特殊要求的地方推广.多层技术可增强数据库的安全性,双钥密码体制是一种有效的数据加密方法.     

License Plate Recognition Based on Transform Coding and Neural Network

A method of vehicle license plate recognition utilizing Karhunen-Loeve(K-L)transform is provided.The transform is used to extract features from a mass of image templates,to describe high-dimensional images with low-dimensional ones,and moreover,to implement data compression and play down complexity of the neural network.With the character to reduce eigenspace dimensionality of K-L transform and the ability to map data of BP network,the method does effectively in recognizing license plates.