It is believed that in modern cryptography , any algorithm of encryption and decryption in cryptographical systems could be public , and the security should rely on the secure key 现代密码学认为,任何加密体系的加密和解密算法都可以公开,其安全性在于密钥的保密性。
Chapter 2 clarifies the cryptographical foundation of e - commerce system . it mainly introduces a hybrid cryptosystem using rc2 and rsa algorithm in our application and some message hash function producing message digest provided by ms ca ( microsoft certificate authority ) such as sha - 1 , md4 and md5 主要论述了系统采用的rc2和rsa相结合的混合密码体制,另外对msca ( microsoftcertificateauthority )所提供的几种产生消息摘要的消息散列函数如: sha - 1 、 md4 、 md5等也进行了分析。
The usefulness of chaos in cryptography depends on the natural relationship between the two research areas : strong dynamical properties of chaotic systems imply strong cryptographical properties of cryptosystems , and the basic way to design cryptosystems containing good strong cryptographical properties implies quasi - chaos 这一想法来自于混沌理论和传统密码学之间的自然联系:一个强的混沌系统的动力学特性大致对应着高强度密码系统的某些安全特征,而具有良好混合性的传统密码系统又暗示着拟混沌现象。
Because of the intrinsic relationship between chaotic systems and cryptosystems : strong dynamical proterties of chaotic systems imply strong cryptographical properties and strong cryptographical properties imply quasi - chaos . chaotic systems , which act as natural cryptosystems , are applied into the cryptography 由于混沌系统和密码学之间存在着一些自然联系:强混沌系统的动力学特性大致对应着高强度密码系统的某些安全特性,而具有良好混合性的传统密码系统又暗含着拟混沌现象,混沌系统作为一种天然的密码系统,被引入到密码学领域。
In this paper we study the security mechanism based on ip , because ipsec protocol is a security mechanism based on cryptograph , we discussed cyptograhical algorithm firstly , then we analyze the cryptographical modes in the enviroment of ip communications 本文对基于ip的安全机制? ? ipsec协议进行了研究, ipsec协议是基于加密机术的安全机制。本文首先研究了加密算法,重点研究了高级加密标准( aes )算法及其在ipsec协议中的应用,并对ip环境下的加密模式做了一定的分析。