基于RC4算法的流密码原理与实现  

The principle of a stream cipher based on RC4 algorithm and how to realize it

作　　者：刘程远 Liu Chengyuan(China Electronics Great Wall hfformation Security System（Shenzhen）Co.,Ltd.,Shenzhen 518057,China)

机构地区：[1]深圳中电长城信息安全系统有限公司,广东深圳518057

出　　处：《信息技术与网络安全》2018年第9期31-33,41,共4页Information Technology and Network Security

摘　　要：在单密钥密码体制的通信中,加密与解密必须使用相同密钥,通信双方如何在不安全的网络环境下安全地交换、管理密钥以及应对密钥泄漏是保障密码安全的关键。流密码提供了一种安全的密钥交换方式,在拥有简单和速度优势的同时,通信双方无需在信道上交换密钥,从物理上避免了密钥进入公网环境。介绍了RC4流密码的原理、优点、在通信项目中的实际应用、保持密钥流同步的方法以及失去同步后恢复的方法。Ciphering and deciphering must use the same key during a single-key-cipher system communication. In this case,how do the messengers exchange and keep their key is important for the security. Stream cipher is a kind of cipher which can exchange key safely. The key stream does not need to be transferred on Internet. This article introduces the principle and advantages of a stream cipher based on RC4 algorithm and how to realize it and synchronize with the other messenger and re-synchronize with each other.

关 键 词：流密码 RC4 单密钥 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]