Controlling cryptographic publication

Over the last decade, controversy has simmered over the degree to which the U.S. Federal government should control the publication of cryptographic research. The debate is not particularly heated at the present time; researchers seem to be waiting to see the results of a system of voluntary controls recommended last year by a panel of the American Council on Education.Despite the quiet, however, it is instructive to examine some of the history underlying the debate for several reasons beyond sheer curiosity. In the first place, such controls, whether voluntary or mandatory sanctions, could influence the future directions of civilian cryptographic research. Secondly, controversy or confrontation could still arise were a researcher to disagree with the results of the voluntary review. Finally, a recent speech by Admiral Inman, since retired as Deputy Director of the CIA, to the American Association for the Advancement of Science suggests that some in the U.S. Government would like to extend such controls to a much wider range of computer science and engineering research.This article is a brief and personal discussion of the principal components of the controversy by an author who found himself occasionally watching it from the sidelines and in some instances uncomfortably in the middle as an NSF project director responsible for some of the research under debate.     

《密码学》课程设置与教学方法探究

讨论了信息安全等专业中《密码学》教学内容设置和教学方法问题。首先分析了《密码学》课程的特点和《密码学》课程设置所需注意的问题;其次设计了一个适用于无抽象代数和初等数论基础学生的《密码学》教学内容和课时分配方案;最后研究了《密码学》的教学方法和教学特点,总结了几点教学经验。     

一个前向安全的强代理签名方案

基于代理签名理论和前向安全签名理论，提出了一个前向安全的强代理签名方案，其安全性建立在求离散对数和模合数求平方根是困难的这两个假设的基础上。此方案同时对代理签名人和原始签名人的权益提供了保护，攻击者即使在第i时段入侵系统，也无法伪造第i时段之前的签名，因而具有较高执行效率和较强的安全性。